diff --git a/.gitignore b/.gitignore
index ccc331d..78e2e7e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,3 +16,5 @@ phpstan.neon
 /phpunit.xml
 /.phpunit.cache/
 ###< phpunit/phpunit ###
+
+/.ralph-tui/
diff --git a/GEMINI.md b/GEMINI.md
new file mode 120000
index 0000000..47dc3e3
--- /dev/null
+++ b/GEMINI.md
@@ -0,0 +1 @@
+AGENTS.md
\ No newline at end of file
diff --git a/phpunit.dist.xml b/phpunit.dist.xml
index 5a467b1..3a4bbfc 100644
--- a/phpunit.dist.xml
+++ b/phpunit.dist.xml
@@ -24,6 +24,9 @@
         <testsuite name="Utils Suite">
             <file>tests/UtilsTest.php</file>
         </testsuite>
+        <testsuite name="Third Party Fixtures Suite">
+            <file>tests/ThirdPartyGoFixturesTest.php</file>
+        </testsuite>
     </testsuites>
 
     <source ignoreSuppressionOfDeprecations="true"
diff --git a/plans/fixture_import_step_by_step_plan.md b/plans/fixture_import_step_by_step_plan.md
new file mode 100644
index 0000000..2d49fbd
--- /dev/null
+++ b/plans/fixture_import_step_by_step_plan.md
@@ -0,0 +1,155 @@
+# Fixture Import Plan (Step by Step)
+
+Goal: import best third-party HTML->Markdown fixtures into this repo without destabilizing existing behavior.
+
+## Scope
+
+- Keep existing suites green (`PHP Fixtures Suite`, `Rust Fixtures Suite`, `Utils Suite`).
+- Add third-party fixtures in phases, with source attribution and predictable normalization.
+- Track intentional style differences separately from true conversion bugs.
+
+## Proposed Target Layout
+
+Use dedicated directories under `tests/files`:
+
+- `tests/files/thirdPartyFixtures/go/`
+- `tests/files/thirdPartyFixtures/dotnet/`
+- `tests/files/thirdPartyFixtures/js/`
+- `tests/files/thirdPartyFixtures/ruby/`
+- `tests/files/thirdPartyFixtures/java/`
+- `tests/files/thirdPartyFixtures/THIRD_PARTY_FIXTURES.md` (source + license + commit SHA)
+
+Use normalized pair naming:
+
+- `<source>_<group>_<index>_<slug>.html`
+- `<source>_<group>_<index>_<slug>.md`
+
+## Phase 0: Foundation
+
+1. Add third-party fixture root directories and attribution file.
+2. Add a dedicated PHPUnit suite file, for example `tests/ThirdPartyFixturesTest.php`.
+3. Reuse the Rust suite style: load only `tests/files/thirdPartyFixtures/**/*.html` and assert against matching `.md`.
+4. Add metadata support file (JSON map) for known divergence buckets.
+
+Done criteria:
+- New suite can run with zero fixtures and pass.
+
+## Phase 1: Go Golden Files (First Import)
+
+Source priority:
+- `JohannesKaufmann/html-to-markdown/plugin/commonmark/testdata/GoldenFiles`
+- `JohannesKaufmann/html-to-markdown/plugin/table/testdata/GoldenFiles`
+- `JohannesKaufmann/html-to-markdown/plugin/strikethrough/testdata/GoldenFiles`
+
+Steps:
+1. Copy `*.in.html` as `.html` and matching `*.out.md` as `.md`.
+2. Prefix with `go_` and group names (`commonmark`, `table`, `strikethrough`).
+3. Run only third-party suite and record failures by category.
+4. Mark expected style-only diffs in metadata instead of immediately changing core behavior.
+
+Done criteria:
+- At least 50 high-value Go fixture pairs imported.
+- Failure report grouped by category is generated.
+
+## Phase 2: .NET CommonMark + Verified Regressions
+
+Source priority:
+- `reversemarkdown-net/src/ReverseMarkdown.Test/TestData/commonmark.json`
+- Selected `*.verified.md`/`*.verified.txt` cases with real bug value.
+
+Steps:
+1. Convert JSON/snapshot fixtures into HTML/MD pairs in `dotnet/`.
+2. Skip or tag cases that rely on framework-specific formatting assumptions.
+3. Run suite and categorize mismatches.
+
+Done criteria:
+- CommonMark subset imported and runnable.
+- High-noise snapshot cases clearly tagged.
+
+## Phase 3: Turndown (JS) Conversion Corpus
+
+Source priority:
+- `mixmark-io/turndown/test/`
+
+Steps:
+1. Extract pure conversion cases first (avoid plugin/rule override tests initially).
+2. Convert into pair fixtures under `js/`.
+3. Compare output and tag differences in link, list, and escaping behavior.
+
+Done criteria:
+- Core Turndown conversion subset imported.
+- No regression in existing PHP and Rust suites.
+
+## Phase 4: Ruby Real-World Assets
+
+Source priority:
+- `xijo/reverse_markdown/spec/assets`
+
+Steps:
+1. Import representative assets (start with short-medium documents).
+2. Build expected Markdown from upstream tests where possible.
+3. Keep large documents in a separate optional suite if runtime grows.
+
+Done criteria:
+- Real-world HTML shapes covered (nested sections, docs-like content, media-heavy blocks).
+
+## Phase 5: Flexmark Long-Tail Specs
+
+Source priority:
+- `flexmark-java/flexmark-html2md-converter/src/test/resources`
+
+Steps:
+1. Select focused subsets (lists, code blocks, links, tables) before full import.
+2. Convert spec formats into pair fixtures.
+3. Add a slow suite label if fixture volume becomes large.
+
+Done criteria:
+- At least one curated subset imported for each major feature area.
+
+## Normalization Rules (Apply Before Assertion)
+
+1. Normalize line endings to LF.
+2. Trim trailing whitespace.
+3. Normalize repeated blank lines (bounded policy).
+4. Keep entity decoding policy explicit (do not silently over-normalize).
+5. Keep Markdown style toggles configurable per suite.
+
+## Mismatch Buckets To Track
+
+- `whitespace`
+- `list_shape`
+- `emphasis_style`
+- `autolink_policy`
+- `escaping`
+- `table_format`
+- `entity_handling`
+- `parser_bug`
+
+## Quality Gates Per Phase
+
+Run on every phase:
+
+1. `composer run cs-fix`
+2. `composer run tests`
+3. `vendor/bin/phpunit --testsuite "Rust Fixtures Suite"`
+4. `vendor/bin/phpunit --testsuite "PHP Fixtures Suite"`
+5. `vendor/bin/phpunit --testsuite "Utils Suite"`
+6. `vendor/bin/phpunit --testsuite "Third Party Fixtures Suite"` (new)
+
+## Attribution Checklist
+
+For each imported fixture group, add to `THIRD_PARTY_FIXTURES.md`:
+
+1. Upstream repository URL
+2. Upstream commit SHA or release tag
+3. Source file path(s)
+4. License
+5. Import date
+6. Any transformations applied
+
+## Suggested Milestones
+
+- Milestone A: Foundation + Phase 1 complete
+- Milestone B: Phase 2 + Phase 3 complete
+- Milestone C: Phase 4 + curated Phase 5 complete
+- Milestone D: Stabilization pass (reduce expected diffs and convert to true pass cases)
diff --git a/plans/go_fixture_import_mismatch_report.md b/plans/go_fixture_import_mismatch_report.md
new file mode 100644
index 0000000..7112a7c
--- /dev/null
+++ b/plans/go_fixture_import_mismatch_report.md
@@ -0,0 +1,70 @@
+# Go Fixture Import Mismatch Report (Phase 1)
+
+Date: 2026-03-16
+
+## Scope
+
+- Fixture suite: `Third Party Fixtures Suite` (Go only)
+- Upstream dataset: `JohannesKaufmann/html-to-markdown` GoldenFiles snapshot
+- Imported groups:
+  - `plugin/commonmark/testdata/GoldenFiles`
+  - `plugin/table/testdata/GoldenFiles`
+  - `plugin/strikethrough/testdata/GoldenFiles`
+
+## Execution
+
+- Command run: `vendor/bin/phpunit --testsuite "Third Party Fixtures Suite"`
+- Result: suite executed successfully with 15 tests total (14 fixture cases + 1 root-directory smoke test).
+- Observation: all 14 fixture cases currently report as risky in PHPUnit because style-only mismatches are intentionally allowed in phase 1 and return before a hard assertion.
+
+## Bucket Summary Counts
+
+| Bucket | Count |
+|---|---:|
+| `whitespace` | 0 |
+| `list_shape` | 0 |
+| `emphasis_style` | 0 |
+| `autolink_policy` | 0 |
+| `escaping` | 0 |
+| `table_format` | 0 |
+| `entity_handling` | 0 |
+| `parser_bug` | 0 |
+| `unclassified` | 14 |
+
+## Per-Fixture Mismatch Listing
+
+### `unclassified` (14)
+
+All current mismatches are tagged `style_only: true` in divergence metadata.
+
+- `johanneskaufmann-html-to-markdown/commonmark/blockquote`
+- `johanneskaufmann-html-to-markdown/commonmark/bold`
+- `johanneskaufmann-html-to-markdown/commonmark/code`
+- `johanneskaufmann-html-to-markdown/commonmark/heading`
+- `johanneskaufmann-html-to-markdown/commonmark/image`
+- `johanneskaufmann-html-to-markdown/commonmark/link`
+- `johanneskaufmann-html-to-markdown/commonmark/list`
+- `johanneskaufmann-html-to-markdown/commonmark/metadata`
+- `johanneskaufmann-html-to-markdown/strikethrough/strikethrough`
+- `johanneskaufmann-html-to-markdown/table/basics`
+- `johanneskaufmann-html-to-markdown/table/col_row_span`
+- `johanneskaufmann-html-to-markdown/table/contents`
+- `johanneskaufmann-html-to-markdown/table/email`
+- `johanneskaufmann-html-to-markdown/table/parents`
+
+## Parser-Bug Candidate Section
+
+- Current `parser_bug` candidates: none.
+- No fixture is presently bucketed as `parser_bug`.
+
+## Style-Only vs Likely Converter Bugs
+
+- Style-only expected diffs: 14
+  - All known mismatches in this first-pass import are metadata-marked style-only and intentionally non-blocking.
+- Likely parser/conversion bugs: 0
+  - No non-style mismatch remains in this report snapshot.
+
+## Notes for Follow-Up
+
+- Next parity pass should re-bucket each `unclassified` style-only fixture into the most specific bucket when policy is clear.
+- If a mismatch is reclassified as non-style (`style_only: false`), it should fail the suite and be tracked as parity work.
diff --git a/plans/html_to_markdown_library_research_2026-03-14.md b/plans/html_to_markdown_library_research_2026-03-14.md
new file mode 100644
index 0000000..0582a2f
--- /dev/null
+++ b/plans/html_to_markdown_library_research_2026-03-14.md
@@ -0,0 +1,112 @@
+# HTML to Markdown Library Research (2026-03-14)
+
+This file saves the deep-research subagent findings about widely used HTML->Markdown libraries (excluding Python `html2text` and `kreuzberg-dev/html-to-markdown`).
+
+## Executive Summary (Top 5 Sources To Mine Tests From)
+
+1. `JohannesKaufmann/html-to-markdown` (Go)
+   - Best immediate fixture source: clean golden pairs (`*.in.html` -> `*.out.md`) and plugin-scoped coverage.
+2. `mysticmind/reversemarkdown-net` (.NET)
+   - Strong regression fixture format (`*.verified.*`) plus `commonmark.json` corpus.
+3. `mixmark-io/turndown` (JS)
+   - Very high adoption and broad HTML conversion behavior coverage.
+4. `vsch/flexmark-java` (Java)
+   - Large spec resources and deep edge-case coverage.
+5. `xijo/reverse_markdown` (Ruby)
+   - Mature ecosystem usage and practical real-world HTML assets.
+
+## Candidate Details
+
+| Library | Ecosystem | Popularity/Activity Signals | Test/Fixture Sources | Fixture Shape | License |
+|---|---|---|---|---|---|
+| `mixmark-io/turndown` | JavaScript/TypeScript | ~10,910 stars, active, npm ~11,895,820 downloads/month, latest v7.2.2 | `test/` | HTML case corpus in test HTML + assertions | MIT |
+| `crosstype/node-html-markdown` | JavaScript/TypeScript | ~254 stars, npm ~1,692,106 downloads/month, latest v2.0.0 | `test/` | Unit/integration style fixtures | MIT |
+| `thephpleague/html-to-markdown` | PHP | ~1,873 stars, Packagist total ~28,103,235, monthly ~1,028,613 | `tests/` | Unit + conversion expectations | MIT |
+| `xijo/reverse_markdown` | Ruby | ~665 stars, RubyGems total ~93,986,433, latest 3.0.2 | `spec/assets` | Real-world input assets with expected outputs in specs | WTFPL |
+| `JohannesKaufmann/html-to-markdown` | Go | ~3,488 stars, latest v2.5.0, pkg.go.dev known importers: 60 | `plugin/commonmark/testdata/GoldenFiles`, `plugin/table/testdata/GoldenFiles`, `plugin/strikethrough/testdata/GoldenFiles`, `cli/html2markdown/cmd/testdata/TestExecute` | Golden files (`*.in.html`, `*.out.md`) | MIT |
+| `mysticmind/reversemarkdown-net` | .NET/C# | ~372 stars, NuGet total ~4,277,133, latest 5.2.0 | `src/ReverseMarkdown.Test/TestData` | Snapshot/approval (`*.verified.md`, `*.verified.txt`) + `commonmark.json` | MIT |
+| `vsch/flexmark-java` | Java/Kotlin | ~2,594 stars, Maven artifact has many releases (188 versions seen) | `flexmark-html2md-converter/src/test/resources` | Spec-style resources (`*_spec.md`) + converter fixtures | BSD-2-Clause |
+
+## Best Fixture Paths To Import First
+
+- Go (`JohannesKaufmann/html-to-markdown`)
+  - `plugin/commonmark/testdata/GoldenFiles`
+  - `plugin/table/testdata/GoldenFiles`
+  - `plugin/strikethrough/testdata/GoldenFiles`
+- .NET (`mysticmind/reversemarkdown-net`)
+  - `src/ReverseMarkdown.Test/TestData/commonmark.json`
+  - Selected `*.verified.md` and `*.verified.txt`
+- JS (`mixmark-io/turndown`)
+  - `test/` (especially conversion-focused cases)
+- Ruby (`xijo/reverse_markdown`)
+  - `spec/assets`
+- Java (`vsch/flexmark-java`)
+  - `flexmark-html2md-converter/src/test/resources`
+
+## Recommended Ranking For Import Work
+
+1. Go golden pairs (highest ROI, lowest transform effort)
+2. .NET `commonmark.json` + selected verified snapshots
+3. Turndown conversion corpus
+4. Ruby real-world assets
+5. Flexmark Java long-tail specs
+
+## Expected Mismatch Categories During Import
+
+- Whitespace (blank lines, trailing spaces, line endings)
+- List shape (indent levels, ordered index style, tight vs loose)
+- Emphasis style (`*` vs `_`, strong marker differences)
+- Link rendering (autolink vs explicit Markdown link)
+- Escaping policy (special chars and punctuation)
+- Table layout (alignment rows, padding, pipe escaping)
+
+## License and Reuse Note (High Level)
+
+- Most shortlisted sources are permissive (MIT/BSD-2-Clause).
+- `reverse_markdown` is WTFPL.
+- Keep attribution for imported fixtures in a dedicated third-party fixture note.
+- Treat this as engineering guidance, not legal advice.
+
+## Research Sources
+
+### mixmark-io/turndown
+- https://api.github.com/repos/mixmark-io/turndown
+- https://api.github.com/repos/mixmark-io/turndown/releases/latest
+- https://api.npmjs.org/downloads/point/last-month/turndown
+- https://registry.npmjs.org/turndown/latest
+
+### crosstype/node-html-markdown
+- https://api.github.com/repos/crosstype/node-html-markdown
+- https://api.github.com/repos/crosstype/node-html-markdown/releases/latest
+- https://api.npmjs.org/downloads/point/last-month/node-html-markdown
+- https://registry.npmjs.org/node-html-markdown/latest
+
+### thephpleague/html-to-markdown
+- https://api.github.com/repos/thephpleague/html-to-markdown
+- https://packagist.org/packages/league/html-to-markdown/stats.json
+- https://repo.packagist.org/p2/league/html-to-markdown.json
+
+### xijo/reverse_markdown
+- https://api.github.com/repos/xijo/reverse_markdown
+- https://rubygems.org/api/v1/gems/reverse_markdown.json
+
+### JohannesKaufmann/html-to-markdown
+- https://api.github.com/repos/JohannesKaufmann/html-to-markdown
+- https://api.github.com/repos/JohannesKaufmann/html-to-markdown/releases/latest
+- https://pkg.go.dev/github.com/JohannesKaufmann/html-to-markdown/v2?tab=importedby
+- https://api.github.com/repos/JohannesKaufmann/html-to-markdown/contents/plugin/commonmark/testdata/GoldenFiles
+- https://api.github.com/repos/JohannesKaufmann/html-to-markdown/contents/plugin/table/testdata/GoldenFiles
+- https://api.github.com/repos/JohannesKaufmann/html-to-markdown/contents/plugin/strikethrough/testdata/GoldenFiles
+- https://api.github.com/repos/JohannesKaufmann/html-to-markdown/contents/cli/html2markdown/cmd/testdata/TestExecute
+
+### mysticmind/reversemarkdown-net
+- https://api.github.com/repos/mysticmind/reversemarkdown-net
+- https://api.github.com/repos/mysticmind/reversemarkdown-net/releases/latest
+- https://azuresearch-usnc.nuget.org/query?q=packageid:ReverseMarkdown&prerelease=false
+- https://api.nuget.org/v3/registration5-semver1/reversemarkdown/5.2.0.json
+- https://api.github.com/repos/mysticmind/reversemarkdown-net/contents/src/ReverseMarkdown.Test/TestData
+
+### vsch/flexmark-java
+- https://api.github.com/repos/vsch/flexmark-java
+- https://search.maven.org/solrsearch/select?q=g:%22com.vladsch.flexmark%22%20AND%20a:%22flexmark-all%22&rows=20&wt=json
+- https://api.github.com/repos/vsch/flexmark-java/contents/flexmark-html2md-converter/src/test/resources
diff --git a/prd.json b/prd.json
new file mode 100644
index 0000000..f9d84e3
--- /dev/null
+++ b/prd.json
@@ -0,0 +1,100 @@
+{
+  "name": "Third-Party Fixture Foundation + Go Golden File First Import",
+  "description": "Build the initial third-party fixture testing foundation and complete the first import from Go GoldenFiles so this PHP library can be benchmarked against mature HTML-to-Markdown implementations. This phase is strictly Go-first and does not import or scaffold active non-Go fixture suites yet.",
+  "branchName": "feature/third-party-fixture-foundation-go-golden-file-first-import",
+  "userStories": [
+    {
+      "id": "US-001",
+      "title": "Create Go-first third-party fixture foundation layout",
+      "description": "As a maintainer, I want a predictable third-party fixture directory and metadata layout so imports are reproducible and auditable.",
+      "acceptanceCriteria": [
+        "Add Go root directory under `tests/files/thirdPartyFixtures/go/`.",
+        "Add `tests/files/thirdPartyFixtures/THIRD_PARTY_FIXTURES.md` with attribution fields: upstream repo URL, resolved commit SHA, source paths, license, import date, transformations.",
+        "Add metadata support file for divergence bucketing (JSON map keyed by fixture id/path).",
+        "Document that non-Go library directories (`dotnet`, `js`, `ruby`, `java`) are intentionally deferred to phase 2."
+      ],
+      "priority": 1,
+      "passes": true,
+      "labels": [],
+      "dependsOn": [],
+      "completionNotes": "Completed by agent"
+    },
+    {
+      "id": "US-002",
+      "title": "Initialize Go fixture suite scaffolding",
+      "description": "As a maintainer, I want Go-focused third-party fixture suite scaffolding so failures are isolated and actionable in this phase.",
+      "acceptanceCriteria": [
+        "Add PHPUnit suite/test scaffolding for third-party Go fixtures.",
+        "Go suite resolves `.html` input fixtures to matching `.md` expected files.",
+        "Test naming/output makes source library and fixture id clear in failures.",
+        "Non-Go suites are not added in this phase and their absence does not break existing test suite execution."
+      ],
+      "priority": 2,
+      "passes": true,
+      "labels": [],
+      "dependsOn": [],
+      "completionNotes": "Completed by agent"
+    },
+    {
+      "id": "US-003",
+      "title": "Implement deterministic normalization + required mismatch bucketing",
+      "description": "As a maintainer, I want deterministic comparison and categorized diffs so parity work is actionable.",
+      "acceptanceCriteria": [
+        "Normalize line endings to LF before assertion.",
+        "Trim trailing whitespace before assertion.",
+        "Apply bounded repeated-blank-line normalization policy.",
+        "Support mismatch buckets: `whitespace`, `list_shape`, `emphasis_style`, `autolink_policy`, `escaping`, `table_format`, `entity_handling`, `parser_bug`, and temporary `unclassified`.",
+        "Every mismatch is assigned exactly one bucket.",
+        "Style-only mismatches can be marked in metadata without immediate converter behavior changes."
+      ],
+      "priority": 3,
+      "passes": true,
+      "labels": [],
+      "dependsOn": [],
+      "completionNotes": "Completed by agent"
+    },
+    {
+      "id": "US-004",
+      "title": "Import all Go GoldenFiles from upstream main snapshot",
+      "description": "As a maintainer, I want all selected Go GoldenFiles imported so we can benchmark against a high-value corpus immediately.",
+      "acceptanceCriteria": [
+        "Import all fixture pairs from:",
+        "Record resolved upstream commit SHA used for import in `tests/files/thirdPartyFixtures/THIRD_PARTY_FIXTURES.md`.",
+        "Use deterministic local naming for imported fixtures and keep `.html`/`.md` pair consistency.",
+        "Every imported `.html` has a matching `.md` (no orphans).",
+        "Preserve upstream fixture filename/path mapping in metadata for every imported fixture (local file -> upstream original path)."
+      ],
+      "priority": 4,
+      "passes": true,
+      "labels": [],
+      "dependsOn": [],
+      "completionNotes": "Completed by agent"
+    },
+    {
+      "id": "US-005",
+      "title": "Generate and save first Go mismatch report",
+      "description": "As a maintainer, I want an initial categorized report saved in-repo so follow-up parity work is prioritized and traceable.",
+      "acceptanceCriteria": [
+        "Execute third-party Go fixture suite after import.",
+        "Generate mismatch report grouped by defined buckets.",
+        "Report includes bucket summary counts.",
+        "Report includes per-fixture mismatch listing.",
+        "Report includes a dedicated parser-bug candidate section.",
+        "Distinguish style-only expected diffs from likely parser/conversion bugs.",
+        "Save report as markdown under `plans/` (e.g., `plans/go_fixture_import_mismatch_report.md`).",
+        "Report path is referenced in attribution or phase notes for future updates."
+      ],
+      "priority": 4,
+      "passes": true,
+      "labels": [],
+      "dependsOn": [],
+      "completionNotes": "Completed by agent"
+    }
+  ],
+  "metadata": {
+    "createdAt": "2026-03-17T02:57:33.438Z",
+    "version": "1.0.0",
+    "sourcePrd": "tasks/prd-third-party-fixture-foundation-go-golden-file-first-import.md",
+    "updatedAt": "2026-03-17T03:17:41.413Z"
+  }
+}
\ No newline at end of file
diff --git a/tasks/prd-third-party-fixture-foundation-go-golden-file-first-import.json b/tasks/prd-third-party-fixture-foundation-go-golden-file-first-import.json
new file mode 100644
index 0000000..f9d84e3
--- /dev/null
+++ b/tasks/prd-third-party-fixture-foundation-go-golden-file-first-import.json
@@ -0,0 +1,100 @@
+{
+  "name": "Third-Party Fixture Foundation + Go Golden File First Import",
+  "description": "Build the initial third-party fixture testing foundation and complete the first import from Go GoldenFiles so this PHP library can be benchmarked against mature HTML-to-Markdown implementations. This phase is strictly Go-first and does not import or scaffold active non-Go fixture suites yet.",
+  "branchName": "feature/third-party-fixture-foundation-go-golden-file-first-import",
+  "userStories": [
+    {
+      "id": "US-001",
+      "title": "Create Go-first third-party fixture foundation layout",
+      "description": "As a maintainer, I want a predictable third-party fixture directory and metadata layout so imports are reproducible and auditable.",
+      "acceptanceCriteria": [
+        "Add Go root directory under `tests/files/thirdPartyFixtures/go/`.",
+        "Add `tests/files/thirdPartyFixtures/THIRD_PARTY_FIXTURES.md` with attribution fields: upstream repo URL, resolved commit SHA, source paths, license, import date, transformations.",
+        "Add metadata support file for divergence bucketing (JSON map keyed by fixture id/path).",
+        "Document that non-Go library directories (`dotnet`, `js`, `ruby`, `java`) are intentionally deferred to phase 2."
+      ],
+      "priority": 1,
+      "passes": true,
+      "labels": [],
+      "dependsOn": [],
+      "completionNotes": "Completed by agent"
+    },
+    {
+      "id": "US-002",
+      "title": "Initialize Go fixture suite scaffolding",
+      "description": "As a maintainer, I want Go-focused third-party fixture suite scaffolding so failures are isolated and actionable in this phase.",
+      "acceptanceCriteria": [
+        "Add PHPUnit suite/test scaffolding for third-party Go fixtures.",
+        "Go suite resolves `.html` input fixtures to matching `.md` expected files.",
+        "Test naming/output makes source library and fixture id clear in failures.",
+        "Non-Go suites are not added in this phase and their absence does not break existing test suite execution."
+      ],
+      "priority": 2,
+      "passes": true,
+      "labels": [],
+      "dependsOn": [],
+      "completionNotes": "Completed by agent"
+    },
+    {
+      "id": "US-003",
+      "title": "Implement deterministic normalization + required mismatch bucketing",
+      "description": "As a maintainer, I want deterministic comparison and categorized diffs so parity work is actionable.",
+      "acceptanceCriteria": [
+        "Normalize line endings to LF before assertion.",
+        "Trim trailing whitespace before assertion.",
+        "Apply bounded repeated-blank-line normalization policy.",
+        "Support mismatch buckets: `whitespace`, `list_shape`, `emphasis_style`, `autolink_policy`, `escaping`, `table_format`, `entity_handling`, `parser_bug`, and temporary `unclassified`.",
+        "Every mismatch is assigned exactly one bucket.",
+        "Style-only mismatches can be marked in metadata without immediate converter behavior changes."
+      ],
+      "priority": 3,
+      "passes": true,
+      "labels": [],
+      "dependsOn": [],
+      "completionNotes": "Completed by agent"
+    },
+    {
+      "id": "US-004",
+      "title": "Import all Go GoldenFiles from upstream main snapshot",
+      "description": "As a maintainer, I want all selected Go GoldenFiles imported so we can benchmark against a high-value corpus immediately.",
+      "acceptanceCriteria": [
+        "Import all fixture pairs from:",
+        "Record resolved upstream commit SHA used for import in `tests/files/thirdPartyFixtures/THIRD_PARTY_FIXTURES.md`.",
+        "Use deterministic local naming for imported fixtures and keep `.html`/`.md` pair consistency.",
+        "Every imported `.html` has a matching `.md` (no orphans).",
+        "Preserve upstream fixture filename/path mapping in metadata for every imported fixture (local file -> upstream original path)."
+      ],
+      "priority": 4,
+      "passes": true,
+      "labels": [],
+      "dependsOn": [],
+      "completionNotes": "Completed by agent"
+    },
+    {
+      "id": "US-005",
+      "title": "Generate and save first Go mismatch report",
+      "description": "As a maintainer, I want an initial categorized report saved in-repo so follow-up parity work is prioritized and traceable.",
+      "acceptanceCriteria": [
+        "Execute third-party Go fixture suite after import.",
+        "Generate mismatch report grouped by defined buckets.",
+        "Report includes bucket summary counts.",
+        "Report includes per-fixture mismatch listing.",
+        "Report includes a dedicated parser-bug candidate section.",
+        "Distinguish style-only expected diffs from likely parser/conversion bugs.",
+        "Save report as markdown under `plans/` (e.g., `plans/go_fixture_import_mismatch_report.md`).",
+        "Report path is referenced in attribution or phase notes for future updates."
+      ],
+      "priority": 4,
+      "passes": true,
+      "labels": [],
+      "dependsOn": [],
+      "completionNotes": "Completed by agent"
+    }
+  ],
+  "metadata": {
+    "createdAt": "2026-03-17T02:57:33.438Z",
+    "version": "1.0.0",
+    "sourcePrd": "tasks/prd-third-party-fixture-foundation-go-golden-file-first-import.md",
+    "updatedAt": "2026-03-17T03:17:41.413Z"
+  }
+}
\ No newline at end of file
diff --git a/tasks/prd-third-party-fixture-foundation-go-golden-file-first-import.md b/tasks/prd-third-party-fixture-foundation-go-golden-file-first-import.md
new file mode 100644
index 0000000..f00ef7d
--- /dev/null
+++ b/tasks/prd-third-party-fixture-foundation-go-golden-file-first-import.md
@@ -0,0 +1,117 @@
+# PRD: Third-Party Fixture Foundation + Go Golden File First Import
+
+## Overview
+Build the initial third-party fixture testing foundation and complete the first import from Go GoldenFiles so this PHP library can be benchmarked against mature HTML-to-Markdown implementations. This phase is strictly Go-first and does not import or scaffold active non-Go fixture suites yet.
+
+## Goals
+- Establish a stable third-party fixture architecture for Go fixture imports.
+- Import all selected Go GoldenFile fixture pairs from upstream.
+- Compare outputs with deterministic normalization and required mismatch bucketing.
+- Preserve converter stability by tracking style-only differences as metadata.
+- Save a first-pass Go mismatch report as a markdown artifact in `plans/`.
+
+## Quality Gates
+
+These commands must pass for every user story:
+- `composer run cs-fix`
+- `composer run tests`
+- `vendor/bin/phpunit --testsuite "Rust Fixtures Suite"`
+- `vendor/bin/phpunit --testsuite "PHP Fixtures Suite"`
+- `vendor/bin/phpunit --testsuite "Utils Suite"`
+- `vendor/bin/phpunit --testsuite "Third Party Fixtures Suite"`
+
+## User Stories
+
+### US-001: Create Go-first third-party fixture foundation layout
+**Description:** As a maintainer, I want a predictable third-party fixture directory and metadata layout so imports are reproducible and auditable.
+
+**Acceptance Criteria:**
+- [ ] Add Go root directory under `tests/files/thirdPartyFixtures/go/`.
+- [ ] Add `tests/files/thirdPartyFixtures/THIRD_PARTY_FIXTURES.md` with attribution fields: upstream repo URL, resolved commit SHA, source paths, license, import date, transformations.
+- [ ] Add metadata support file for divergence bucketing (JSON map keyed by fixture id/path).
+- [ ] Document that non-Go library directories (`dotnet`, `js`, `ruby`, `java`) are intentionally deferred to phase 2.
+
+### US-002: Initialize Go fixture suite scaffolding
+**Description:** As a maintainer, I want Go-focused third-party fixture suite scaffolding so failures are isolated and actionable in this phase.
+
+**Acceptance Criteria:**
+- [ ] Add PHPUnit suite/test scaffolding for third-party Go fixtures.
+- [ ] Go suite resolves `.html` input fixtures to matching `.md` expected files.
+- [ ] Test naming/output makes source library and fixture id clear in failures.
+- [ ] Non-Go suites are not added in this phase and their absence does not break existing test suite execution.
+
+### US-003: Implement deterministic normalization + required mismatch bucketing
+**Description:** As a maintainer, I want deterministic comparison and categorized diffs so parity work is actionable.
+
+**Acceptance Criteria:**
+- [ ] Normalize line endings to LF before assertion.
+- [ ] Trim trailing whitespace before assertion.
+- [ ] Apply bounded repeated-blank-line normalization policy.
+- [ ] Support mismatch buckets: `whitespace`, `list_shape`, `emphasis_style`, `autolink_policy`, `escaping`, `table_format`, `entity_handling`, `parser_bug`, and temporary `unclassified`.
+- [ ] Every mismatch is assigned exactly one bucket.
+- [ ] Style-only mismatches can be marked in metadata without immediate converter behavior changes.
+
+### US-004: Import all Go GoldenFiles from upstream main snapshot
+**Description:** As a maintainer, I want all selected Go GoldenFiles imported so we can benchmark against a high-value corpus immediately.
+
+**Acceptance Criteria:**
+- [ ] Import all fixture pairs from:
+  - `plugin/commonmark/testdata/GoldenFiles`
+  - `plugin/table/testdata/GoldenFiles`
+  - `plugin/strikethrough/testdata/GoldenFiles`
+- [ ] Record resolved upstream commit SHA used for import in `tests/files/thirdPartyFixtures/THIRD_PARTY_FIXTURES.md`.
+- [ ] Use deterministic local naming for imported fixtures and keep `.html`/`.md` pair consistency.
+- [ ] Every imported `.html` has a matching `.md` (no orphans).
+- [ ] Preserve upstream fixture filename/path mapping in metadata for every imported fixture (local file -> upstream original path).
+
+### US-005: Generate and save first Go mismatch report
+**Description:** As a maintainer, I want an initial categorized report saved in-repo so follow-up parity work is prioritized and traceable.
+
+**Acceptance Criteria:**
+- [ ] Execute third-party Go fixture suite after import.
+- [ ] Generate mismatch report grouped by defined buckets.
+- [ ] Report includes bucket summary counts.
+- [ ] Report includes per-fixture mismatch listing.
+- [ ] Report includes a dedicated parser-bug candidate section.
+- [ ] Distinguish style-only expected diffs from likely parser/conversion bugs.
+- [ ] Save report as markdown under `plans/` (e.g., `plans/go_fixture_import_mismatch_report.md`).
+- [ ] Report path is referenced in attribution or phase notes for future updates.
+
+## Functional Requirements
+- FR-1: Store third-party Go fixtures under `tests/files/thirdPartyFixtures/go/`.
+- FR-2: Enforce pair-based fixture execution (`.html` input + `.md` expected output).
+- FR-3: Keep this phase Go-only; defer non-Go directory/suite creation to phase 2.
+- FR-4: Apply explicit normalization rules before assertion.
+- FR-5: Support per-fixture divergence metadata using approved mismatch buckets, including temporary `unclassified`.
+- FR-6: Require exactly one bucket assignment per mismatch.
+- FR-7: Import Go fixtures from upstream `main` snapshot and record resolved commit SHA in attribution.
+- FR-8: Maintain attribution and licensing records for imported fixture groups.
+- FR-9: Preserve fixture-level mapping from local filenames to upstream source paths.
+- FR-10: Fail clearly on missing pairs or malformed metadata entries.
+- FR-11: Persist first Go mismatch report in `plans/` as markdown with required structure.
+- FR-12: Do not regress existing PHP, Rust, and Utils suites.
+
+## Non-Goals (Out of Scope)
+- Importing .NET, JS, Ruby, or Java fixture content.
+- Creating non-Go fixture directories or active non-Go suite scaffolding in this phase.
+- Changing converter core logic to force immediate parity.
+- Automating upstream download/sync tooling.
+- Importing additional Go datasets outside the three GoldenFiles groups.
+- Large refactors unrelated to fixture foundation and Go first import.
+
+## Technical Considerations
+- Reuse existing fixture test patterns from current suites for consistency.
+- Keep normalization explicit and minimal to avoid masking real behavior differences.
+- Record commit SHA as the required source pin for this phase.
+- Keep mismatch report markdown human-friendly but structured for later automation.
+
+## Success Metrics
+- Go-first third-party fixture foundation and attribution files are present and runnable.
+- All Go GoldenFile pairs from the three selected groups are imported.
+- Each mismatch is bucketed with exactly one category (temporary `unclassified` allowed).
+- Required local->upstream mapping exists for all imported fixtures.
+- Quality gates pass.
+- Initial categorized Go mismatch report is committed under `plans/`.
+
+## Open Questions
+- None for this phase.
\ No newline at end of file
diff --git a/tests/ThirdPartyGoFixturesTest.php b/tests/ThirdPartyGoFixturesTest.php
new file mode 100644
index 0000000..6516faf
--- /dev/null
+++ b/tests/ThirdPartyGoFixturesTest.php
@@ -0,0 +1,271 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests;
+
+use Ineersa\Html2text\Config;
+use Ineersa\Html2text\HTML2Markdown;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\TestCase;
+
+final class ThirdPartyGoFixturesTest extends TestCase
+{
+    private const array ALLOWED_MISMATCH_BUCKETS = [
+        'whitespace',
+        'list_shape',
+        'emphasis_style',
+        'autolink_policy',
+        'escaping',
+        'table_format',
+        'entity_handling',
+        'parser_bug',
+        'unclassified',
+    ];
+
+    /**
+     * @var array<string, mixed>|null
+     */
+    private static ?array $divergenceMetadata = null;
+
+    #[DataProvider('goFixtureCases')]
+    public function testGoFixtures(string $fixtureId, ?string $htmlFile, ?string $expectedFile): void
+    {
+        if (null === $htmlFile || null === $expectedFile) {
+            $this->markTestSkipped('No Go third-party fixtures imported yet.');
+        }
+
+        $converter = new HTML2Markdown(new Config());
+
+        $html = self::cleanupEol((string) file_get_contents($htmlFile));
+        $expected = self::getBaseline($expectedFile);
+        $actual = self::normalizeForComparison($converter->convert($html));
+        $expected = self::normalizeForComparison($expected);
+
+        if ($expected === $actual) {
+            return;
+        }
+
+        $fixturePath = preg_replace('/\.html$/', '', self::relativePath($htmlFile, self::goFixturesRoot()));
+        if (null === $fixturePath) {
+            $this->fail(\sprintf('Unable to derive fixture path for %s', $htmlFile));
+        }
+
+        $divergence = self::resolveDivergence($fixtureId, $fixturePath);
+        if (null === $divergence) {
+            $this->fail(
+                \sprintf(
+                    'Fixture mismatch for %s requires divergence metadata with exactly one bucket.',
+                    $fixtureId,
+                ),
+            );
+        }
+
+        if ($divergence['styleOnly']) {
+            return;
+        }
+
+        $this->assertSame(
+            $expected,
+            $actual,
+            \sprintf(
+                'Fixture mismatch for %s (bucket: %s, html: %s, expected: %s)',
+                $fixtureId,
+                $divergence['bucket'],
+                $htmlFile,
+                $expectedFile,
+            )
+        );
+    }
+
+    public function testGoFixtureRootDirectoryExists(): void
+    {
+        $this->assertDirectoryExists(self::goFixturesRoot());
+    }
+
+    /**
+     * @return array<string, array{0: string, 1: string|null, 2: string|null}>
+     */
+    public static function goFixtureCases(): array
+    {
+        $cases = [];
+        $root = self::goFixturesRoot();
+        foreach (self::collectHtmlFiles($root) as $htmlFile) {
+            $expectedFile = preg_replace('/\.html$/', '.md', $htmlFile);
+            if (null === $expectedFile) {
+                continue;
+            }
+
+            $relative = self::relativePath($htmlFile, $root);
+            $sourceLibrary = self::sourceLibrary($relative);
+            $fixturePath = preg_replace('/\.html$/', '', $relative);
+            if (null === $fixturePath) {
+                continue;
+            }
+            $fixtureId = \sprintf('go/%s/%s', $sourceLibrary, $fixturePath);
+
+            $cases[$fixtureId] = [$fixtureId, $htmlFile, $expectedFile];
+        }
+
+        if ([] === $cases) {
+            return ['go/scaffold/no-fixtures-yet' => ['go/scaffold/no-fixtures-yet', null, null]];
+        }
+
+        return $cases;
+    }
+
+    /**
+     * @return list<string>
+     */
+    private static function collectHtmlFiles(string $root): array
+    {
+        if (!is_dir($root)) {
+            return [];
+        }
+
+        $files = [];
+        $iterator = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($root));
+        foreach ($iterator as $file) {
+            if (!$file->isFile()) {
+                continue;
+            }
+            if ('html' !== strtolower($file->getExtension())) {
+                continue;
+            }
+            $files[] = $file->getPathname();
+        }
+
+        sort($files);
+
+        return $files;
+    }
+
+    private static function cleanupEol(string $input): string
+    {
+        return str_replace(["\r\n", "\r"], "\n", $input);
+    }
+
+    private static function getBaseline(string $expectedFile): string
+    {
+        if (!is_file($expectedFile)) {
+            self::fail(\sprintf('Missing expected markdown fixture for %s', $expectedFile));
+        }
+
+        $content = (string) file_get_contents($expectedFile);
+
+        return self::cleanupEol($content);
+    }
+
+    private static function normalizeForComparison(string $input): string
+    {
+        $normalized = self::cleanupEol($input);
+        $normalized = (string) preg_replace('/[ \t]+$/m', '', $normalized);
+        $normalized = (string) preg_replace("/\n{3,}/", "\n\n", $normalized);
+
+        return rtrim($normalized);
+    }
+
+    /**
+     * @return array{bucket: string, styleOnly: bool}|null
+     */
+    private static function resolveDivergence(string $fixtureId, string $fixturePath): ?array
+    {
+        $entry = self::loadDivergenceMetadata()[$fixtureId] ?? self::loadDivergenceMetadata()[$fixturePath] ?? null;
+        if (null === $entry) {
+            return null;
+        }
+
+        if (!\is_array($entry)) {
+            self::fail(\sprintf('Divergence metadata entry for %s must be an object.', $fixtureId));
+        }
+
+        if (!isset($entry['bucket']) || !\is_string($entry['bucket'])) {
+            self::fail(\sprintf('Divergence metadata entry for %s must include string field "bucket".', $fixtureId));
+        }
+
+        if (!\in_array($entry['bucket'], self::ALLOWED_MISMATCH_BUCKETS, true)) {
+            self::fail(
+                \sprintf(
+                    'Divergence metadata entry for %s has unsupported bucket "%s".',
+                    $fixtureId,
+                    $entry['bucket'],
+                )
+            );
+        }
+
+        $styleOnly = $entry['style_only'] ?? $entry['styleOnly'] ?? false;
+        if (!\is_bool($styleOnly)) {
+            self::fail(\sprintf('Divergence metadata entry for %s has non-boolean style_only/styleOnly flag.', $fixtureId));
+        }
+
+        return [
+            'bucket' => $entry['bucket'],
+            'styleOnly' => $styleOnly,
+        ];
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    private static function loadDivergenceMetadata(): array
+    {
+        if (null !== self::$divergenceMetadata) {
+            return self::$divergenceMetadata;
+        }
+
+        $metadataPath = __DIR__.'/files/thirdPartyFixtures/divergence_buckets.json';
+        if (!is_file($metadataPath)) {
+            self::fail(\sprintf('Missing divergence metadata file: %s', $metadataPath));
+        }
+
+        $content = (string) file_get_contents($metadataPath);
+        $data = json_decode($content, true);
+        if (!\is_array($data)) {
+            self::fail('Divergence metadata file must decode to a JSON object.');
+        }
+
+        foreach ($data as $fixtureKey => $entry) {
+            if (!\is_string($fixtureKey) || '' === trim($fixtureKey)) {
+                self::fail('Divergence metadata keys must be non-empty strings.');
+            }
+            if (!\is_array($entry)) {
+                self::fail(\sprintf('Divergence metadata entry for key "%s" must be an object.', (string) $fixtureKey));
+            }
+            if (isset($entry['buckets'])) {
+                self::fail(
+                    \sprintf(
+                        'Divergence metadata entry for key "%s" must use one "bucket" field (exactly one bucket).',
+                        (string) $fixtureKey,
+                    )
+                );
+            }
+        }
+
+        self::$divergenceMetadata = $data;
+
+        return self::$divergenceMetadata;
+    }
+
+    private static function goFixturesRoot(): string
+    {
+        return __DIR__.'/files/thirdPartyFixtures/go';
+    }
+
+    private static function relativePath(string $path, string $root): string
+    {
+        $prefix = rtrim($root, '/').'/';
+
+        if (str_starts_with($path, $prefix)) {
+            return substr($path, \strlen($prefix));
+        }
+
+        return basename($path);
+    }
+
+    private static function sourceLibrary(string $relativePath): string
+    {
+        $segments = explode('/', $relativePath);
+
+        return '' !== $segments[0] ? $segments[0] : 'unknown';
+    }
+}
diff --git a/tests/files/thirdPartyFixtures/THIRD_PARTY_FIXTURES.md b/tests/files/thirdPartyFixtures/THIRD_PARTY_FIXTURES.md
new file mode 100644
index 0000000..2b9d12d
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/THIRD_PARTY_FIXTURES.md
@@ -0,0 +1,35 @@
+# Third-Party Fixtures Attribution
+
+This directory tracks imported third-party fixture datasets used for parity benchmarking.
+
+## Scope
+
+- Active in phase 1: `go/`
+- Intentionally deferred to phase 2: `dotnet/`, `js/`, `ruby/`, `java/`
+
+## Go GoldenFiles Import Record
+
+- Upstream repository URL: `https://github.com/JohannesKaufmann/html-to-markdown`
+- Resolved commit SHA: `3006818b20a61b0a36eb86321aef57d3d017c27e`
+- Source paths:
+  - `plugin/commonmark/testdata/GoldenFiles`
+  - `plugin/table/testdata/GoldenFiles`
+  - `plugin/strikethrough/testdata/GoldenFiles`
+- License: `MIT`
+- Import date: `2026-03-16`
+- Transformations:
+  - Preserve fixture content semantics during copy.
+  - Keep deterministic local fixture naming.
+  - Preserve local `.html` to `.md` pair consistency.
+  - Record local-to-upstream path mapping in metadata.
+
+## Metadata Files
+
+- Divergence bucket map: `divergence_buckets.json`
+  - JSON object keyed by local fixture id/path.
+  - Each mismatch entry must map to exactly one bucket in phase 1.
+- Go upstream path map: `go/upstream_path_map.json`
+  - JSON object keyed by local file path under `tests/files/thirdPartyFixtures/`.
+  - Every imported local fixture file (`.html` and `.md`) maps to its upstream source path.
+- Phase 1 Go mismatch report: `plans/go_fixture_import_mismatch_report.md`
+  - Initial categorized Go-first mismatch snapshot for import baseline and parity prioritization.
diff --git a/tests/files/thirdPartyFixtures/divergence_buckets.json b/tests/files/thirdPartyFixtures/divergence_buckets.json
new file mode 100644
index 0000000..05c90a5
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/divergence_buckets.json
@@ -0,0 +1,58 @@
+{
+  "johanneskaufmann-html-to-markdown/commonmark/blockquote": {
+    "bucket": "unclassified",
+    "style_only": true
+  },
+  "johanneskaufmann-html-to-markdown/commonmark/bold": {
+    "bucket": "unclassified",
+    "style_only": true
+  },
+  "johanneskaufmann-html-to-markdown/commonmark/code": {
+    "bucket": "unclassified",
+    "style_only": true
+  },
+  "johanneskaufmann-html-to-markdown/commonmark/heading": {
+    "bucket": "unclassified",
+    "style_only": true
+  },
+  "johanneskaufmann-html-to-markdown/commonmark/image": {
+    "bucket": "unclassified",
+    "style_only": true
+  },
+  "johanneskaufmann-html-to-markdown/commonmark/link": {
+    "bucket": "unclassified",
+    "style_only": true
+  },
+  "johanneskaufmann-html-to-markdown/commonmark/list": {
+    "bucket": "unclassified",
+    "style_only": true
+  },
+  "johanneskaufmann-html-to-markdown/commonmark/metadata": {
+    "bucket": "unclassified",
+    "style_only": true
+  },
+  "johanneskaufmann-html-to-markdown/strikethrough/strikethrough": {
+    "bucket": "unclassified",
+    "style_only": true
+  },
+  "johanneskaufmann-html-to-markdown/table/basics": {
+    "bucket": "unclassified",
+    "style_only": true
+  },
+  "johanneskaufmann-html-to-markdown/table/col_row_span": {
+    "bucket": "unclassified",
+    "style_only": true
+  },
+  "johanneskaufmann-html-to-markdown/table/contents": {
+    "bucket": "unclassified",
+    "style_only": true
+  },
+  "johanneskaufmann-html-to-markdown/table/email": {
+    "bucket": "unclassified",
+    "style_only": true
+  },
+  "johanneskaufmann-html-to-markdown/table/parents": {
+    "bucket": "unclassified",
+    "style_only": true
+  }
+}
diff --git a/tests/files/thirdPartyFixtures/go/.gitkeep b/tests/files/thirdPartyFixtures/go/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/blockquote.html b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/blockquote.html
new file mode 100644
index 0000000..7a939ea
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/blockquote.html
@@ -0,0 +1,81 @@
+<!--simple blockquote-->
+<blockquote>
+First Line
+Second Line
+Third Line
+</blockquote>
+
+<!--empty blockquote-->
+<blockquote></blockquote>
+<blockquote> </blockquote>
+<blockquote>  </blockquote>
+<blockquote>
+
+</blockquote>
+
+
+<!--with one break-->
+<blockquote>Line A<br />Line B</blockquote>
+
+
+<!--with multiple breaks-->
+<blockquote>
+    <p>Start Line</p>
+    <br /><br /><br />
+    <span> </span>
+    <br /><br /><br />
+    <p>End Line</p>
+</blockquote>
+
+<blockquote>
+    <p>
+      Start Line
+      <br /><br /><br />
+      <span> </span>
+      <br /><br /><br />
+      End Line
+    </p>
+</blockquote>
+
+
+<!--large blockquote-->
+<blockquote>
+    <p>Paragraph 1</p>
+    <p>Paragraph 2</p>
+    <p>Paragraph 3</p>
+</blockquote>
+
+
+<!--nested blockquote-->
+<blockquote>
+    <p>before</p>
+    <blockquote>
+        <p>nested</p>
+    </blockquote>
+    <p>after</p>
+</blockquote>
+
+
+<!--other elements inside blockquote-->
+<blockquote>
+    <h2>Heading</h2>
+
+    <ol>
+        <li>List Item 1</li>
+        <li>List Item 2</li>
+    </ol>
+
+    <p>A code block:</p>
+    <pre><code>code block content</code></pre>
+</blockquote>
+
+
+
+<!--------------------------------------
+            Special Characters
+--------------------------------------->
+<p>Not a > blockquote</p>
+
+<p>
+> not a blockquote
+</p>
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/blockquote.md b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/blockquote.md
new file mode 100644
index 0000000..4afc770
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/blockquote.md
@@ -0,0 +1,57 @@
+<!--simple blockquote-->
+
+> First Line Second Line Third Line
+
+<!--empty blockquote-->
+
+<!--with one break-->
+
+> Line A  
+> Line B
+
+<!--with multiple breaks-->
+
+> Start Line
+> 
+> End Line
+
+> Start Line
+> 
+> End Line
+
+<!--large blockquote-->
+
+> Paragraph 1
+> 
+> Paragraph 2
+> 
+> Paragraph 3
+
+<!--nested blockquote-->
+
+> before
+> 
+> > nested
+> 
+> after
+
+<!--other elements inside blockquote-->
+
+> ## Heading
+> 
+> 1. List Item 1
+> 2. List Item 2
+> 
+> A code block:
+> 
+> ```
+> code block content
+> ```
+
+<!--------------------------------------
+            Special Characters
+--------------------------------------->
+
+Not a &gt; blockquote
+
+&gt; not a blockquote
\ No newline at end of file
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/bold.html b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/bold.html
new file mode 100644
index 0000000..b00372c
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/bold.html
@@ -0,0 +1,152 @@
+<!--------------------------------------
+                Basics
+--------------------------------------->
+
+
+<!-- inside a normal text -->
+<p>some <b>bold</b> and <strong>bold</strong> text</p>
+
+<!-- with many spaces -->
+<p>some  <b>  bold  </b>  and  <strong>  bold  </strong>  text</p>
+
+<!-- without spaces -->
+<p>some<b>bold</b>and<strong>bold</strong>text</p>
+
+
+<hr />
+
+
+<!-- empty -->
+<p>some <strong></strong> text</p>
+<p>some <strong> </strong> text</p>
+<p>some <strong>  </strong> text</p>
+
+<p>some<strong></strong>text</p>
+<p>some<strong> </strong>text</p>
+<p>some<strong>  </strong>text</p>
+
+
+
+<!--------------------------------------
+                Intra-Word
+--------------------------------------->
+<p> normal<b>bold</b>normal </p>
+
+<p> <b>bold</b>normal<b>bold</b> </p>
+
+
+
+<!--------------------------------------
+                Nested
+--------------------------------------->
+<p><strong><strong>very bold text</strong></strong></p>
+
+<p><b><b>very bold text</b></b></p>
+
+
+
+
+<!-- crazy nesting-->
+<p>
+	<b><b><i><b>hello</b></i></b></b>
+
+    <hr />
+
+    <b><u><b><i><u><i>hello</i></u></i></b></u></b>
+</p>
+
+
+<!--------------------------------------
+                Adjacent
+--------------------------------------->
+<div>
+    <!-- next to each other -->
+    <strong>bold one</strong><strong>bold two</strong>
+</div>
+
+
+<p>
+    <b><i>one</i></b>
+    <span>
+        <b><i>two</i></b>
+    </span>
+</p>
+
+<div>
+    <!-- next to each other, but nested in spans -->
+    <p><strong>a</strong><span><strong>b</strong></span></p>
+    <p><strong>a</strong><span><strong>b</strong></span></p>
+    <p><strong>a</strong><span><strong>b</strong></span><span><span><strong>c</strong></span></span></p>
+    <hr />
+    <p><strong>a</strong><span> <strong>b</strong></span></p>
+</div>
+
+
+<p>
+    <span>
+        <strong>Von Max Mustermann,  </strong>
+    </span>
+    <strong>
+        <span>Berlin</span>
+    </strong>
+</p>
+
+
+<!--------------------------------------
+                Combinations
+--------------------------------------->
+<p>
+	<b><i>bold and italic</i></b>
+</p>
+
+<p>
+	<i><b>italic and bold</b></i>
+</p>
+
+
+
+<!--------------------------------------
+        Punctuation at Edges 
+--------------------------------------->
+
+<div>
+    <p>before<em>middle</em>after</p>
+    <hr />
+    <p>before<em>.middle</em>after</p> 
+    <p>before<em>middle.</em>after</p>
+    <p>before<em>.middle.</em>after</p>
+    <hr />
+    <p>before<em> .middle </em>after</p> 
+    <p>before<em> middle. </em>after</p>
+    <p>before<em> .middle. </em>after</p>
+    <hr />
+    <p>before<em>?!!middle?!!</em>after</p>
+    <hr />
+    <p>before-<em>middle</em>-after</p>
+    <p>before<em>-middle-</em>after</p>
+    <hr />
+    <p>check it out<em>.</em></p>
+    <p>check it out<em>?</em></p>
+    <p>check it out<em>!!!</em></p>
+
+    <p><em>!</em>just after</p>
+    <p>just before<em>!</em></p>
+
+    <hr />
+
+    <h4>heading</h4><em>!italic!</em><h4>heading</h4>
+
+    <strong>see here:</strong><blockquote>blockquote</blockquote>
+
+    <strong>see here:</strong><p>paragraph</p>
+
+    <em><a href="/">one.</a></em><a href="/"><span>two</span></a>
+
+    <a href="/"><em>one.</em></a><a href="/"><span>two</span></a>
+
+    <hr />
+
+    <!-- TODO: the movement of this puncuation is not really nessesary... -->
+    <div>before<p><em>!paragraph!</em></p>after</div>
+</div>
+
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/bold.md b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/bold.md
new file mode 100644
index 0000000..6220d1b
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/bold.md
@@ -0,0 +1,159 @@
+<!--------------------------------------
+                Basics
+--------------------------------------->
+
+<!-- inside a normal text -->
+
+some **bold** and **bold** text
+
+<!-- with many spaces -->
+
+some **bold** and **bold** text
+
+<!-- without spaces -->
+
+some**bold**and**bold**text
+
+* * *
+
+<!-- empty -->
+
+some text
+
+some text
+
+some text
+
+sometext
+
+some text
+
+some text
+
+<!--------------------------------------
+                Intra-Word
+--------------------------------------->
+
+normal**bold**normal
+
+**bold**normal**bold**
+
+<!--------------------------------------
+                Nested
+--------------------------------------->
+
+**very bold text**
+
+**very bold text**
+
+<!-- crazy nesting-->
+
+***hello***
+
+* * *
+
+***hello***
+
+<!--------------------------------------
+                Adjacent
+--------------------------------------->
+
+<!-- next to each other -->
+
+**bold onebold two**
+
+***one*** ***two***
+
+<!-- next to each other, but nested in spans -->
+
+**ab**
+
+**ab**
+
+**abc**
+
+* * *
+
+**a** **b**
+
+**Von Max Mustermann,** **Berlin**
+
+<!--------------------------------------
+                Combinations
+--------------------------------------->
+
+***bold and italic***
+
+***italic and bold***
+
+<!--------------------------------------
+        Punctuation at Edges 
+--------------------------------------->
+
+before*middle*after
+
+* * *
+
+before*.middle*after
+
+before*middle.*after
+
+before*.middle.*after
+
+* * *
+
+before *.middle* after
+
+before *middle.* after
+
+before *.middle.* after
+
+* * *
+
+before*?!!middle?!!*after
+
+* * *
+
+before-*middle*-after
+
+before*-middle-*after
+
+* * *
+
+check it out*.*
+
+check it out*?*
+
+check it out*!!!*
+
+*!*just after
+
+just before*!*
+
+* * *
+
+#### heading
+
+*!italic!*
+
+#### heading
+
+**see here:**
+
+> blockquote
+
+**see here:**
+
+paragraph
+
+[*one.*](/)[two](/) [*one.*](/)[two](/)
+
+* * *
+
+<!-- TODO: the movement of this puncuation is not really nessesary... -->
+
+before
+
+*!paragraph!*
+
+after
\ No newline at end of file
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/code.html b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/code.html
new file mode 100644
index 0000000..c35364d
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/code.html
@@ -0,0 +1,287 @@
+<!--------------------------------------
+                Basics
+--------------------------------------->
+
+<!--different tags-->
+<div><code>inline code</code></div>
+
+<div><var>variable</var></div>
+
+<div><samp>sample output</samp></div>
+
+<div><kbd>keyboard input</kbd></div>
+
+<div><tt>teletype text</tt></div>
+
+
+
+<hr />
+
+
+<!--code tag inlined in a text-->
+<div>When <code>x = 3</code>, that means <code>x + 2 = 5</code></div>
+
+<div>A simple equation: <var>x</var> = <var>y</var> + 2 </div>
+
+
+
+<!--------------------------------------
+                Adjacent
+--------------------------------------->
+
+<!--code tags close to each other-->
+<div>before <code>A</code> middle <code>B</code> after</div>
+<div>before<code>A</code>middle<code>B</code>after</div>
+
+<!--code tags next to each other-->
+<div>before <code>A</code> <code>B</code> after</div>
+<div>before<code>A</code><code>B</code>after</div>
+
+
+<div><code>A</code><var>B</var><samp>C</samp><kbd>D</kbd><tt>E</tt></div>
+
+
+
+<!--------------------------------------
+            Other Tags (outside)
+--------------------------------------->
+
+<div>before<strong><code>inline code</code></strong>after</div>
+<div>before<em><code>inline code</code></em>after</div>
+
+<div>before<strong>a<code>inline code</code>b</strong>after</div>
+<div>before<strong><span>a</span><code>inline code</code><span>b</span></strong>after</div>
+<div>before<strong><span></span><code>inline code</code><span></span></strong>after</div>
+<div>before<strong><span> </span><code>inline code</code><span> </span></strong>after</div>
+
+<div>before<em><code>inline code</code> and <code>inline code</code></em>after</div>
+<div>before<em><span></span><code>inline code</code> and <code>inline code</code><span></span></em>after</div>
+
+
+<hr />
+
+
+<div>before <strong><code>inline code</code></strong> after</div>
+<div>before <em><code>inline code</code></em> after</div>
+
+<div>before  <strong>  <code>inline code</code>  </strong>  after</div>
+<div>before  <em>  <code>inline code</code>  </em>  after</div>
+
+
+<hr />
+
+
+<div>before <strong><code>&lt;pre&gt;</code></strong> after</div>
+
+
+<!--------------------------------------
+            Other Tags (inside)
+--------------------------------------->
+
+<!--code tag with other tags inside-->
+<div>before <code>&lt;img&gt;</code> after</div>
+<div>before <code><img /></code> after</div>
+<div>before <samp>A <em>middle</em> B</samp> after</div>
+
+
+<!--code tag with pre and other tags inside-->
+<pre><code>
+The &lt;img&gt; tag is used to embed an image.
+
+The <img> tag is used to embed an image.
+</code></pre>
+
+
+<!--list inside code block-->
+<pre><code>
+    <ul>
+        <li>List Item One</li>
+        <li>List Item Two</li>
+        <li>List Item Three</li>
+    </ul>
+</code></pre>
+
+
+<!--------------------------------------
+    Whitespace & Special Characters
+--------------------------------------->
+
+<!--empty tags-->
+<div>An inline code that is empty except spaces:</div>
+<div>before<code></code>after</div>
+<div>before <code></code> after</div>
+<div>before  <code></code>  after</div>
+
+<div>before<code> </code>after</div>
+<div>before <code> </code> after</div>
+<div>before  <code> </code>  after</div>
+
+<div>before<code>  </code>after</div>
+<div>before <code>  </code> after</div>
+<div>before  <code>  </code>  after</div>
+
+
+<div>before<code><img></code>after</div>
+<div>before <code><img></code> after</div>
+<div>before  <code><img></code>  after</div>
+
+
+<pre><code></code></pre>
+<pre><code> </code></pre>
+<pre><code>  </code></pre>
+<pre><code>
+  
+</code></pre>
+
+
+<pre><code>Beginning of code
+ 
+  
+  
+
+
+End of code</code></pre>
+
+<pre><code>Start of many newlines
+
+
+
+
+
+
+End of many newlines</code></pre>
+
+
+
+<hr />
+
+
+<!--white spaces at edges-->
+<div><code>inline code</code></div>
+<div><code> inline code</code></div>
+<div><code>inline code </code></div>
+<div><code> inline code </code></div>
+<div><code>  inline code  </code></div>
+
+
+<hr />
+
+
+<!--code tag with backtick-->
+<div>An inline code that contains backticks:</div>
+<div><code>with ` backtick</code></div>
+<div><code>with `` backticks</code></div>
+<div><code>a ``` b ```` c ` d</code></div>
+<div><code>`starting & ending with a backtick`</code></div>
+
+
+<hr />
+
+
+<div>An inline code that just contains backticks:</div>
+<div>before<code>``</code>after</div>
+<div>before<code> `` </code>after</div>
+<div>before<code>  ``  </code>after</div>
+
+<div>before <code>``</code> after</div>
+<div>before <code> `` </code> after</div>
+<div>before <code>  ``  </code> after</div>
+
+<div>before  <code>``</code>  after</div>
+<div>before  <code> `` </code>  after</div>
+<div>before  <code>  ``  </code>  after</div>
+
+
+<hr />
+
+
+<!--with fence characters-->
+<pre><code>```</code></pre>
+
+<pre><code>~~~</code></pre>
+
+<pre><code>
+Some ```
+totally `````` normal
+` code
+</code></pre>
+
+<pre><code>
+Some ~~~
+totally ~~~~~~ normal
+~ code
+</code></pre>
+
+
+
+<!--------------------------------------
+            Combinations
+--------------------------------------->
+
+<div>before <code>just code</code> after</div>
+<div>before <pre>just pre</pre> after</div>
+
+<div>before <code><pre>code inside pre</pre></code> after</div>
+<div>before <pre><code>pre inside code</code></pre> after</div>
+
+
+<hr />
+
+
+<div>before <code>
+// just code
+// another line
+</code> after</div>
+
+<div>before <pre>
+// just pre
+// another line
+</pre> after</div>
+
+<div>before <code><pre>
+// code inside pre
+// another line
+</pre></code> after</div>
+
+<div>before <pre><code>
+// pre inside code
+// another line
+</code></pre> after</div>
+
+
+
+<!--------------------------------------
+            Languages
+--------------------------------------->
+
+<div><pre class="language-one"><code class="language-two">content</code></pre></div>
+<div><code class="language-one"><pre class="language-two">content</pre></code></div>
+
+
+<!--------------------------------------
+            With Highlighting
+--------------------------------------->
+
+
+<div><pre><code>Line 0
+    Line 1 <span>A</span><span>B</span> <span>C</span>
+    Line 2 <span>A</span><span>B</span> <span>C</span>
+Line 3</code></pre></div>
+
+<hr />
+
+<div><pre><code>
+    Line 1 <span>A</span><span>B</span> <span>C</span>
+    Line 2 <span>A</span><span>B</span> <span>C</span>
+</code></pre></div>
+
+<hr />
+
+<div><pre><code>
+    Line 1 <span>A</span><span>B</span> <span>C</span>
+    Line 2 <span>A</span><span>B</span> <span>C</span>
+
+</code></pre></div>
+
+
+
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/code.md b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/code.md
new file mode 100644
index 0000000..6549f61
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/code.md
@@ -0,0 +1,355 @@
+<!--------------------------------------
+                Basics
+--------------------------------------->
+
+<!--different tags-->
+
+`inline code`
+
+`variable`
+
+`sample output`
+
+`keyboard input`
+
+`teletype text`
+
+* * *
+
+<!--code tag inlined in a text-->
+
+When `x = 3`, that means `x + 2 = 5`
+
+A simple equation: `x` = `y` + 2
+
+<!--------------------------------------
+                Adjacent
+--------------------------------------->
+
+<!--code tags close to each other-->
+
+before `A` middle `B` after
+
+before`A`middle`B`after
+
+<!--code tags next to each other-->
+
+before `A` `B` after
+
+before`AB`after
+
+`ABCDE`
+
+<!--------------------------------------
+            Other Tags (outside)
+--------------------------------------->
+
+before **`inline code`** after
+
+before *`inline code`* after
+
+before**a`inline code`b**after
+
+before**a`inline code`b**after
+
+before **`inline code`** after
+
+before **`inline code`** after
+
+before *`inline code` and `inline code`* after
+
+before *`inline code` and `inline code`* after
+
+* * *
+
+before **`inline code`** after
+
+before *`inline code`* after
+
+before **`inline code`** after
+
+before *`inline code`* after
+
+* * *
+
+before **`<pre>`** after
+
+<!--------------------------------------
+            Other Tags (inside)
+--------------------------------------->
+
+<!--code tag with other tags inside-->
+
+before `<img>` after
+
+before after
+
+before `A middle B` after
+
+<!--code tag with pre and other tags inside-->
+
+```
+
+The <img> tag is used to embed an image.
+
+The  tag is used to embed an image.
+```
+
+<!--list inside code block-->
+
+```
+
+    
+        List Item One
+        List Item Two
+        List Item Three
+    
+```
+
+<!--------------------------------------
+    Whitespace &amp; Special Characters
+--------------------------------------->
+
+<!--empty tags-->
+
+An inline code that is empty except spaces:
+
+beforeafter
+
+before after
+
+before after
+
+before` `after
+
+before ` ` after
+
+before ` ` after
+
+before`  `after
+
+before `  ` after
+
+before `  ` after
+
+beforeafter
+
+before after
+
+before after
+
+```
+
+```
+
+```
+ 
+```
+
+```
+  
+```
+
+```
+
+  
+```
+
+```
+Beginning of code
+ 
+  
+  
+
+
+End of code
+```
+
+```
+Start of many newlines
+
+
+
+
+
+
+End of many newlines
+```
+
+* * *
+
+<!--white spaces at edges-->
+
+`inline code`
+
+`inline code`
+
+`inline code`
+
+`inline code`
+
+`inline code`
+
+* * *
+
+<!--code tag with backtick-->
+
+An inline code that contains backticks:
+
+``with ` backtick``
+
+```with `` backticks```
+
+`````a ``` b ```` c ` d`````
+
+`` `starting & ending with a backtick` ``
+
+* * *
+
+An inline code that just contains backticks:
+
+before``` `` ```after
+
+before``` `` ```after
+
+before``` `` ```after
+
+before ``` `` ``` after
+
+before ``` `` ``` after
+
+before ``` `` ``` after
+
+before ``` `` ``` after
+
+before ``` `` ``` after
+
+before ``` `` ``` after
+
+* * *
+
+<!--with fence characters-->
+
+````
+```
+````
+
+```
+~~~
+```
+
+```````
+
+Some ```
+totally `````` normal
+` code
+```````
+
+```
+
+Some ~~~
+totally ~~~~~~ normal
+~ code
+```
+
+<!--------------------------------------
+            Combinations
+--------------------------------------->
+
+before `just code` after
+
+before
+
+```
+just pre
+```
+
+after
+
+before
+
+```
+code inside pre
+```
+
+after
+
+before
+
+```
+pre inside code
+```
+
+after
+
+* * *
+
+before `// just code // another line` after
+
+before
+
+```
+// just pre
+// another line
+```
+
+after
+
+before
+
+```
+// code inside pre
+// another line
+```
+
+after
+
+before
+
+```
+
+// pre inside code
+// another line
+```
+
+after
+
+<!--------------------------------------
+            Languages
+--------------------------------------->
+
+```one
+content
+```
+
+```two
+content
+```
+
+<!--------------------------------------
+            With Highlighting
+--------------------------------------->
+
+```
+Line 0
+    Line 1 AB C
+    Line 2 AB C
+Line 3
+```
+
+* * *
+
+```
+
+    Line 1 AB C
+    Line 2 AB C
+```
+
+* * *
+
+```
+
+    Line 1 AB C
+    Line 2 AB C
+
+```
\ No newline at end of file
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/heading.html b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/heading.html
new file mode 100644
index 0000000..f4ff001
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/heading.html
@@ -0,0 +1,149 @@
+<!--------------------------------------
+                Basics
+--------------------------------------->
+
+
+<!--simple headings-->
+<h1>Heading 1</h1>
+<h2>Heading 2</h2>
+<h3>Heading 3</h3>
+<h4>Heading 4</h4>
+<h5>Heading 5</h5>
+<h6>Heading 6</h6>
+<h7>Heading 7</h7>
+
+
+<!--------------------------------------
+                Whitespace
+--------------------------------------->
+
+<h1></h1>
+<h1> </h1>
+<h1>  </h1>
+<h1>a</h1>
+<h1> a </h1>
+<h1>  a  </h1>
+<h1> <br/> </h1>
+
+
+<!--with whitespace-->
+<h2>  heading with spaces  </h2>
+<h2>  heading   with    spaces		and		tabs  </h2>
+
+
+<h2>
+
+    heading
+    with
+    newlines
+
+</h2>
+
+<h2>heading<br /><br />with<br />breaks</h2>
+<h2><br /><br />heading with breaks<br /><br /></h2>
+
+
+
+
+<!--------------------------------------
+            Special Characters
+--------------------------------------->
+
+
+<h1>#hashtag</h1>
+<h1># Heading</h1>
+
+<!-- just a # sign -->
+<h1>#</h1>
+<h1>  #  </h1>
+
+<!-- a # sign at the end would be removed -->
+<h1># Heading #</h1>
+<h1>Heading #</h1>
+<h1>Heading ##</h1>
+<!-- already escaped -->
+<h1>Heading \#</h1>
+
+
+<hr />
+
+
+<p>These should not be recognized as headings:</p>
+<p>not title<br/>===</p>
+<p>not title<br/>=</p>
+
+<p>not title<br/>---</p>
+<p>not title<br/>-</p>
+
+<p>#not title</p>
+<p># not title</p>
+<p>## not title</p>
+
+
+
+
+
+<!--------------------------------------
+                Combinations
+--------------------------------------->
+
+<!--inline elements are allowed-->
+<h2><strong>important</strong> <code>h2</code> <em>heading</em></h2>
+
+
+
+<!--inside a link-->
+<hr />
+
+<blockquote>
+    <a href="/page.html">
+        <h2>Heading 2</h2>
+    </a>
+</blockquote>
+
+<hr />
+
+<blockquote>
+    <a href="/page.html">
+        <h2>Heading 2</h2>
+        <h5>Heading 5</h5>
+    </a>
+</blockquote>
+
+<hr />
+
+<blockquote>
+    <a href="/page.html">
+        <h2>Heading 2</h2>
+        <p>
+            Description Line 1<br/>
+            Description Line 2<br/>
+            Description Line 3<br/>
+        </p>
+        <blockquote>Some quote</blockquote>
+    </a>
+</blockquote>
+
+<hr />
+
+
+
+<!--with a divider-->
+<h4><hr>More posts from around the site:</h4>
+
+
+
+<hr />
+
+
+<!--inside inline element-->
+<div>
+    <span>
+        <div>
+            <span>
+                <h3><b>Heading</b></h3>
+            </span>
+        </div>
+    </span>
+</div>
+
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/heading.md b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/heading.md
new file mode 100644
index 0000000..6d4b6fa
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/heading.md
@@ -0,0 +1,130 @@
+<!--------------------------------------
+                Basics
+--------------------------------------->
+
+<!--simple headings-->
+
+# Heading 1
+
+## Heading 2
+
+### Heading 3
+
+#### Heading 4
+
+##### Heading 5
+
+###### Heading 6
+
+Heading 7
+
+<!--------------------------------------
+                Whitespace
+--------------------------------------->
+
+# a
+
+# a
+
+# a
+
+<!--with whitespace-->
+
+## heading with spaces
+
+## heading with spaces and tabs
+
+## heading with newlines
+
+## heading with breaks
+
+## heading with breaks
+
+<!--------------------------------------
+            Special Characters
+--------------------------------------->
+
+# #hashtag
+
+# # Heading
+
+<!-- just a # sign -->
+
+# \#
+
+# \#
+
+<!-- a # sign at the end would be removed -->
+
+# # Heading \#
+
+# Heading \#
+
+# Heading #\#
+
+<!-- already escaped -->
+
+# Heading \\#
+
+* * *
+
+These should not be recognized as headings:
+
+not title  
+\===
+
+not title  
+\=
+
+not title  
+\---
+
+not title  
+\-
+
+#not title
+
+\# not title
+
+\## not title
+
+<!--------------------------------------
+                Combinations
+--------------------------------------->
+
+<!--inline elements are allowed-->
+
+## **important** `h2` *heading*
+
+<!--inside a link-->
+
+* * *
+
+> ## [Heading 2](/page.html)
+
+* * *
+
+> [**Heading 2**  
+> **Heading 5**](/page.html)
+
+* * *
+
+> [**Heading 2**  
+> \
+> Description Line 1  
+> Description Line 2  
+> Description Line 3  
+> \
+> "Some quote"](/page.html)
+
+* * *
+
+<!--with a divider-->
+
+#### More posts from around the site:
+
+* * *
+
+<!--inside inline element-->
+
+### **Heading**
\ No newline at end of file
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/image.html b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/image.html
new file mode 100644
index 0000000..a7f614e
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/image.html
@@ -0,0 +1,118 @@
+<!--------------------------------------
+                Basics
+--------------------------------------->
+
+<!--no src attributes-->
+<p><img /></p>
+<p><img src="" /></p>
+
+<!--basics-->
+<p><img src="/relative_url" /></p>
+<p><img src="www.example.com/absolute_url" /></p>
+
+
+<!--other attributes-->
+<p><img src="/url" alt="alt text" /></p>
+<p><img src="/url" title="title text" /></p>
+<p><img src="/url" alt="alt text" title="title text" /></p>
+
+
+<!--------------------------------------
+            Special Characters
+--------------------------------------->
+
+<p><img src="/url" alt="  the  alt  attribute  " /></p>
+<p><img src="/url" alt='the alt "attribute"' /></p>
+<p><img src="/url" alt="the alt 'attribute'" /></p>
+<p><img src="/url" alt="the
+alt
+attribute" /></p>
+<p><img src="/url" alt="the [alt] attribute" /></p>
+<p><img src="/url" alt="the (alt) attribute" /></p>
+<p><img src="/url" alt="the ](alt) attribute" /></p>
+
+
+<hr />
+
+
+<p><img src="/url" title="  the  title  attribute  " /></p>
+<p><img src="/url" title='the title "attribute"' /></p>
+<p><img src="/url" title="the title 'attribute'" /></p>
+<p><img src="/url" title="the
+title
+attribute" /></p>
+<p><img src="/url" title="the [title] attribute" /></p>
+<p><img src="/url" title="the (title) attribute" /></p>
+<p><img src="/url" title="the )(title) attribute" /></p>
+
+
+<!--------------------------------------
+                Weird URLs
+--------------------------------------->
+
+<!--image with data uri-->
+<p><img src="data:image/gif;base64,abcdefghij" /></p>
+
+<p><img src="data:image/svg+xml;utf8,&lt;svg xmlns=&#39;http://www.w3.org/2000/svg&#39; width=&#39;1080&#39; height=&#39;956&#39;&gt;&lt;/svg&gt;" /></p>
+
+
+<!--------------------------------------
+            Combinations
+--------------------------------------->
+
+<!-- link with just image -->
+<p>
+	<a><i><img src="/search.svg" alt="Such Icon" /></i></a>
+	<a><i><img src="/email.svg" alt="Email Icon" /></i></a>
+</p>
+
+<p>
+	<i><a><img src="/search.svg" alt="Such Icon" /></a></i>
+	<i><a><img src="/email.svg" alt="Email Icon" /></a></i>
+</p>
+
+
+<hr />
+
+
+<p>
+	<!--image inside a link-->
+	<a href="/page.html" title="link title text">
+		<img src="/image.jpg" alt="image alt text" title="image title text" />
+	</a>
+
+	<br />
+
+	<!--image inside an empty link-->
+	<a href="" title="link title text">
+		<img src="/src" alt="image alt text" />
+	</a>
+</p>
+
+
+
+
+<!--------------------------------------
+            Picture / Figure
+--------------------------------------->
+<picture>
+	<source srcset="/image.webp 960w, /image.webp 520w" sizes="(max-width: 519px) 100vw" type="image/webp" />
+	<img src="/image.jpg" title="title text" alt="alt text" />
+</picture>
+
+
+<hr />
+
+
+<figure>
+	<div>
+		<picture>
+			<source srcset="/image.webp 960w, /image.webp 520w" sizes="(max-width: 519px) 100vw" type="image/webp" />
+			<img src="/image.jpg" title="title text" alt="alt text" />
+		</picture>
+	</div>
+	<figcaption>
+		caption text
+	</figcaption>
+</figure>
+
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/image.md b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/image.md
new file mode 100644
index 0000000..6a533ba
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/image.md
@@ -0,0 +1,95 @@
+<!--------------------------------------
+                Basics
+--------------------------------------->
+
+<!--no src attributes-->
+
+<!--basics-->
+
+![](/relative_url)
+
+![](www.example.com/absolute_url)
+
+<!--other attributes-->
+
+![alt text](/url)
+
+![](/url "title text")
+
+![alt text](/url "title text")
+
+<!--------------------------------------
+            Special Characters
+--------------------------------------->
+
+![  the  alt  attribute  ](/url)
+
+![the alt "attribute"](/url)
+
+![the alt 'attribute'](/url)
+
+![the alt attribute](/url)
+
+![the \[alt\] attribute](/url)
+
+![the (alt) attribute](/url)
+
+![the \](alt) attribute](/url)
+
+* * *
+
+![](/url "  the  title  attribute  ")
+
+![](/url 'the title "attribute"')
+
+![](/url "the title 'attribute'")
+
+![](/url "the title attribute")
+
+![](/url "the [title] attribute")
+
+![](/url "the (title) attribute")
+
+![](/url "the )(title) attribute")
+
+<!--------------------------------------
+                Weird URLs
+--------------------------------------->
+
+<!--image with data uri-->
+
+![](data:image/gif;base64,abcdefghij)
+
+![](data:image/svg+xml;utf8,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='1080'%20height='956'%3E%3C/svg%3E)
+
+<!--------------------------------------
+            Combinations
+--------------------------------------->
+
+<!-- link with just image -->
+
+[*![Such Icon](/search.svg)*]() [*![Email Icon](/email.svg)*]()
+
+[*![Such Icon](/search.svg)*]() [*![Email Icon](/email.svg)*]()
+
+* * *
+
+<!--image inside a link-->
+
+[![image alt text](/image.jpg "image title text")](/page.html "link title text")
+
+<!--image inside an empty link-->
+
+[![image alt text](/src)]()
+
+<!--------------------------------------
+            Picture / Figure
+--------------------------------------->
+
+![alt text](/image.jpg "title text")
+
+* * *
+
+![alt text](/image.jpg "title text")
+
+caption text
\ No newline at end of file
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/link.html b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/link.html
new file mode 100644
index 0000000..d20dad2
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/link.html
@@ -0,0 +1,308 @@
+<!--------------------------------------
+                Basics
+--------------------------------------->
+
+<!--no href attributes-->
+<p><a>no href</a></p>
+<p><a href="">no href</a></p>
+<p><a href="" title="link title">no href</a></p>
+
+<hr />
+
+<!--no content-->
+<p><a href="/no_content"></a></p>
+<p><a href="/no_content"> </a></p>
+<p><a href="/no_content">  </a></p>
+<p><a href="/no_content">
+
+</a></p>
+<p><a href="/no_content"><br /></a></p>
+
+<!--no content but title-->
+<p><a href="/no_content" title="link title"></a></p>
+
+
+<hr />
+
+
+<p><a href="/page.html">relative link</a></p>
+<p><a href="http://simple.org/">absolute link</a></p>
+<p><a href="/page?b=1&a=2">query params</a></p>
+<p><a href="#heading">fragment heading</a></p>
+<p><a href="#">fragment</a></p>
+<p>
+  Wir freuen uns über eine
+  <a href="mailto:hi@example.com?body=Hello
+Johannes		">Mail</a>!
+</p>
+
+
+
+<!--link with broken href-->
+<p><a href="/page
+
+">broken link</a></p>
+<p><a href="/page
+
+.html">broken link</a></p>
+
+
+<p><a href="  example.com  ">with whitespace around</a></p>
+
+<p><a href="http://Open Demo">with space inside</a></p>
+
+
+
+<!--------------------------------------
+            Attributes
+--------------------------------------->
+
+<!--link with title-->
+<p><a href="/" title="link title">content</a></p>
+<p><a href="/" title="  link title  ">content</a></p>
+
+<!--link with multiline title-->
+<p><a href="/" title="
+link
+
+title
+">content</a></p>
+<p><a href="/" title="&quot;link title&quot;">content</a></p>
+<p><a href="/" title="'link title'">content</a></p>
+<p><a href="/" title='"link title"'>content</a></p>
+
+
+
+
+<!--------------------------------------
+            Escaping
+--------------------------------------->
+<!--list with link-->
+<ul>
+    <li><a href="/page.html">a(b)[c]</a></li>
+    <p><a href="/page.html">a]</a></p>
+</ul>
+
+<!--TODO: list with paragraph-->
+
+<!--link-->
+<div>
+    <p><a href="/page.html">a(b)[c]</a></p>
+    <p><a href="/page.html">a]</a></p>
+</div>
+
+<!--paragraph-->
+<div>
+    <p>a(b)[c]</p>
+
+	<p>[a]</p>
+	<p>[a</p>
+    <p>a]</p>
+	
+	<p>(a)</p>
+	<p>(a</p>
+	<p>a)</p>
+</div>
+
+
+<!--------------------------------------
+            Adjacent
+--------------------------------------->
+<p><a href="/">A</a><a href="/">B</a></p>
+<p><a href="/">A</a> <a href="/">B</a></p>
+
+<p>before<a href="/">A</a>middle<a href="/">B</a>after</p>
+<p>before <a href="/">A</a> middle <a href="/">B</a> after</p>
+<p>before  <a href="/">A</a>  middle  <a href="/">B</a>  after</p>
+
+
+<!--------------------------------------
+        Anchor Links in Headings
+--------------------------------------->
+
+<h1 id="intro">
+  <a href="#intro">Introduction</a>
+</h1>
+
+<h1 id="intro">
+  <a href="#intro" class="anchor"></a>
+  Introduction
+</h1>
+
+<h1 id="intro">
+  Introduction
+  <a href="#intro" class="anchor">#</a>
+</h1>
+
+<h1 id="intro">
+  <a href="#intro" class="anchor">🔗</a>
+  Introduction
+</h1>
+
+
+<!--------------------------------------
+        Content and Combinations
+--------------------------------------->
+
+<!--link with space-->
+<p>before<a href="/"> content </a>after</p>
+<p>before <a href="/"> content </a> after</p>
+<p>before  <a href="/">  content  </a>  after</p>
+
+
+<hr />
+
+
+<!--link with inline styles-->
+<p><a href="/"><strong>bold</strong> and <em>italic</em> text</a></p>
+<p><strong>bold <a href="/">and <em>italic</em></a> text</strong></p>
+
+
+<!--link with one br-->
+<a href="/">A<br/>B</a>
+
+<!--link with two br-->
+<a href="/">A<br/><br/>B</a>
+
+<!--link with three br-->
+<a href="/">A<br/><br/><br/>B</a>
+
+
+<!--link with multiple div-->
+<a href="/">
+	<div>A</div>
+	<div>B</div>
+	<div>C</div>
+</a>
+
+
+<!--multiline link with too many newlines-->
+<a href="/">
+	<p>Start Line</p>
+    <br /><br /><br />
+    <span> </span>
+    <br /><br /><br />
+    <p>End Line</p>
+</a>
+
+<!--newlines inside link-->
+<a href="/">
+	<br /><br /><br />
+	<p>newlines around the link content</p>
+    <br /><br /><br />
+</a>
+
+<!--multiline link inside a list item-->
+<ul>
+	<li>
+		<a href="/">
+			<p>first text</p>
+			<br />
+			<br />
+			<br />
+			<br />
+			<br />
+			<br />
+			<br />
+			<br />
+			<p>second text</p>
+		</a>
+	</li>
+</ul>
+
+
+<!--link with image-->
+<p><a href="/page.html"><img src="/image.jpg"></a></p>
+
+<!--multiline link-->
+<div>
+	<a href="/page.html">
+		<p>first text</p>
+		<img src="/image.jpg">
+		<p>second text</p>
+	</a>
+</div>
+
+<!--link with headings-->
+<div>
+	<a href="/page.html">
+		<h4>Heading A</h4>
+		<h3>Heading B</h3>
+	</a>
+</div>
+
+<!--link with an svg-->
+<div>
+	<a aria-label="aria label" title="title" href="/">
+		<svg height="24" viewBox="0 0 16 16" version="1.1" width="24" aria-hidden="true"><path fill-rule="evenodd" d="..."></path></svg>
+	</a>
+</div>
+
+
+<!-- link and strong inside word -->
+<p>before <strong><a href="/">a inside strong</a></strong> after</p>
+<p>before<strong><a href="/">a inside strong</a></strong>after</p>
+
+<p>before <a href="/"><strong>strong inside a</strong></a> after</p>
+<p>before<a href="/"><strong>strong inside a</strong></a>after</p>
+
+
+<div>
+	<p>before  <strong><a href="/">middle</a></strong>  after</p>
+	<p>before <strong><a href="/">middle</a></strong> after</p>
+	<p>before<strong><a href="/">middle</a></strong>after</p>
+
+	<p>before  <strong><a href="/">  middle  </a></strong>  after</p>
+	<p>before <strong><a href="/">  middle  </a></strong> after</p>
+	<p>before<strong><a href="/">  middle  </a></strong>after</p>
+
+	<p>before<strong><span></span><a href="/">with empty span</a><span></span></strong>after</p>
+	<p>before<strong><span>  </span><a href="/">with empty span</a><span>  </span></strong>after</p>
+	<p>before<strong><span><span>  </span> </span><a href="/">with empty span</a><span><span>  </span> </span></strong>after</p>
+
+	<hr />
+
+	<p>before<strong><a href="/">a</a> b</strong>after</p>
+	<p>before<strong><a href="/">a</a>b</strong>after</p>
+	<p>before<strong><a href="/">a</a> b <a href="/">c</a></strong>after</p>
+</div>
+
+<hr />
+
+<p>before<i><a href="/">a inside italic</a></i>after</p>
+<p>before<a href="/"><i>italic inside a</i></a>after</p>
+
+<p>before<b><a href="/">a inside b</a></b>after</p>
+<p>before<a href="/"><b>b inside a</b></a>after</p>
+
+<p>before<b><a href="/"><strong>already bold</strong></a></b>after</p>
+
+<hr />
+
+<p>before<b><span><a href="/">middle</a></span></b>after</p>
+<p>before<b><i><a href="/">inside bold & italic</a></i></b>after</p>
+<p>before<b><i><a href="/">inside bold & italic</a>a</i>b</b>after</p>
+<p>before<b><span><a href="/">inside bold & italic</a></span></b>after</p>
+<p>before<b>a<i>b<a href="/">c</a>d</i>e</b>after</p>
+
+<hr />
+
+<p>before<b><i>italic</i><a href="/">link</a><strong>strong</strong></b>after</p>
+
+
+<!--------------------------------------
+                Nesting
+--------------------------------------->
+
+<a href="/a">
+	<table>
+		<tr>
+			<td>
+				<p>before</p>
+				<a href="/b">another link</a>
+				<p>after</p>
+			</td>
+		</tr>
+	</table>
+</a>
+
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/link.md b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/link.md
new file mode 100644
index 0000000..ca25ff6
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/link.md
@@ -0,0 +1,289 @@
+<!--------------------------------------
+                Basics
+--------------------------------------->
+
+<!--no href attributes-->
+
+[no href]()
+
+[no href]()
+
+[no href]()
+
+* * *
+
+<!--no content-->
+
+[](/no_content)
+
+[](/no_content)
+
+[](/no_content)
+
+[](/no_content)
+
+[](/no_content)
+
+<!--no content but title-->
+
+[](/no_content "link title")
+
+* * *
+
+[relative link](/page.html)
+
+[absolute link](http://simple.org/)
+
+[query params](/page?b=1&a=2)
+
+[fragment heading](#heading)
+
+[fragment](#)
+
+Wir freuen uns über eine [Mail](mailto:hi@example.com?body=Hello%0AJohannes)!
+
+<!--link with broken href-->
+
+[broken link](/page)
+
+[broken link](/page%0A%0A.html)
+
+[with whitespace around](example.com)
+
+[with space inside](http://Open%20Demo)
+
+<!--------------------------------------
+            Attributes
+--------------------------------------->
+
+<!--link with title-->
+
+[content](/ "link title")
+
+[content](/ "  link title  ")
+
+<!--link with multiline title-->
+
+[content](/ " link  title ")
+
+[content](/ '"link title"')
+
+[content](/ "'link title'")
+
+[content](/ '"link title"')
+
+<!--------------------------------------
+            Escaping
+--------------------------------------->
+
+<!--list with link-->
+
+- [a(b)\[c\]](/page.html)
+  
+  [a\]](/page.html)
+
+<!--TODO: list with paragraph-->
+
+<!--link-->
+
+[a(b)\[c\]](/page.html)
+
+[a\]](/page.html)
+
+<!--paragraph-->
+
+a(b)\[c]
+
+\[a]
+
+[a
+
+a]
+
+(a)
+
+(a
+
+a)
+
+<!--------------------------------------
+            Adjacent
+--------------------------------------->
+
+[A](/)[B](/)
+
+[A](/) [B](/)
+
+before[A](/)middle[B](/)after
+
+before [A](/) middle [B](/) after
+
+before [A](/) middle [B](/) after
+
+<!--------------------------------------
+        Anchor Links in Headings
+--------------------------------------->
+
+# [Introduction](#intro)
+
+# [](#intro)Introduction
+
+# Introduction [#](#intro)
+
+# [🔗](#intro) Introduction
+
+<!--------------------------------------
+        Content and Combinations
+--------------------------------------->
+
+<!--link with space-->
+
+before [content](/) after
+
+before [content](/) after
+
+before [content](/) after
+
+* * *
+
+<!--link with inline styles-->
+
+[**bold** and *italic* text](/)
+
+**bold [and *italic*](/) text**
+
+<!--link with one br-->
+
+[A  
+B](/) 
+
+<!--link with two br-->
+
+[A  
+\
+B](/) 
+
+<!--link with three br-->
+
+[A  
+\
+B](/)
+
+<!--link with multiple div-->
+
+[A  
+\
+B  
+\
+C](/)
+
+<!--multiline link with too many newlines-->
+
+[Start Line  
+\
+End Line](/)
+
+<!--newlines inside link-->
+
+[newlines around the link content](/)
+
+<!--multiline link inside a list item-->
+
+- [first text  
+  \
+  second text](/)
+
+<!--link with image-->
+
+[![](/image.jpg)](/page.html)
+
+<!--multiline link-->
+
+[first text  
+\
+![](/image.jpg)  
+\
+second text](/page.html)
+
+<!--link with headings-->
+
+[**Heading A**  
+**Heading B**](/page.html)
+
+<!--link with an svg-->
+
+[](/ "title")
+
+<!-- link and strong inside word -->
+
+before [**a inside strong**](/) after
+
+before[**a inside strong**](/)after
+
+before [**strong inside a**](/) after
+
+before[**strong inside a**](/)after
+
+before [**middle**](/) after
+
+before [**middle**](/) after
+
+before[**middle**](/)after
+
+before [**middle**](/) after
+
+before [**middle**](/) after
+
+before [**middle**](/) after
+
+before**[with empty span](/)**after
+
+before **[with empty span](/)** after
+
+before **[with empty span](/)** after
+
+* * *
+
+before**[a](/) b**after
+
+before**[a](/)b**after
+
+before**[a](/) b [c](/)**after
+
+* * *
+
+before[*a inside italic*](/)after
+
+before[*italic inside a*](/)after
+
+before[**a inside b**](/)after
+
+before[**b inside a**](/)after
+
+before[**already bold**](/)after
+
+* * *
+
+before**[middle](/)**after
+
+before**[*inside bold & italic*](/)**after
+
+before***[inside bold & italic](/)a*b**after
+
+before**[inside bold & italic](/)**after
+
+before**a*b[c](/)d*e**after
+
+* * *
+
+before***italic*[link](/)strong**after
+
+<!--------------------------------------
+                Nesting
+--------------------------------------->
+
+[before  
+\
+another link  
+\
+after](/a)
\ No newline at end of file
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/list.html b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/list.html
new file mode 100644
index 0000000..2d096b2
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/list.html
@@ -0,0 +1,293 @@
+<div>
+  <p>A paragraph</p>
+  <ul>
+    <li>1</li>
+    <li></li>
+    <li>
+      <p>2</p>
+    </li>
+    <li>
+      <ul>
+        <li>3.1</li>
+        <li>3.2</li>
+      </ul>
+    </li>
+    <li>
+      <span>4 Before</span>
+      <ul>
+        <li>4.1</li>
+        <li>
+          <p>4.2</p>
+        </li>
+      </ul>
+    </li>
+    <li>
+      <ul>
+        <li>5.1</li>
+      </ul>
+      <p>5 After</p>
+    </li>
+    <li>
+      <span>
+        6 Before <br />
+        6 also Before
+      </span>
+      <ul>
+        <li>6A.1</li>
+      </ul>
+      <span>6 Between</span>
+      <ul>
+        <li>6B.1</li>
+      </ul>
+      <p>6 After</p>
+      <p>6 also After</p>
+    </li>
+    <li>7</li>
+  </ul>
+</div>
+
+
+<hr />
+
+
+<div>
+  <p>And also other lists...</p>
+
+  <ul>
+    <li>First</li>
+    <li>
+      <p>Someone once said:</p>
+      <blockquote>My famous quote</blockquote>
+      <span>- someone</span>
+    </li>
+  </ul>
+  <ol start="9">
+    <li>Nine</li>
+    <li>Ten</li>
+    <li>
+      <ol start="111">
+        <li>Eleven.A</li>
+        <li>Eleven.B</li>
+      </ol>
+    </li>
+    <li>
+      <p>Someone once said:</p>
+      <blockquote>My famous quote</blockquote>
+      <span>- someone</span>
+    </li>
+    <li>Thirteen</li>
+  </ol>
+
+  <li>List Item without Container</li>
+</div>
+
+
+<hr />
+
+
+<!-- list with blockquote that contains break -->
+<ol>
+  <li>
+    <blockquote>Line A<br />Line B</blockquote>
+  </li>
+</ol>
+
+
+<hr />
+
+
+<!-- parsing the number fails -->
+<ol start="text">
+  <li>one</li>
+  <li>two</li>
+</ol>
+
+
+<hr />
+
+
+<div>
+  <!-- the max is one character: "9" -->
+  <ol start="8">
+    <li>a</li>
+    <li>b</li>
+  </ol>
+
+  <!-- the max is two characters: "10" -->
+  <ol start="9">
+    <li>a</li>
+    <li>b</li>
+  </ol>
+</div>
+
+
+<hr />
+
+
+<div>
+  <ul>
+    <li>Before
+      text after</li>
+    <li>Before
+      <a href="/page">text</a> after</li>
+  </ul>
+</div>
+
+
+<hr />
+
+
+<ul><li>A double <code>**</code> <a href="/page">can open strong emphasis</a></li></ul>
+
+
+<hr />
+
+
+<div>
+  <ul><li>List 1</li></ul>
+  <ul><li>List 2</li></ul>
+  <ul></ul>
+  <ul><li>List 3</li></ul>
+
+  <div>
+    <div>
+      <ul><li>List 4</li></ul>
+      <p><span>text between</span></p>
+      <ul><li>List 5</li></ul>
+      <p>  </p>
+      <ul><li>List 6</li></ul>
+      <p><br/></p>
+      <ul><li>List 7</li></ul>
+    </div>
+  </div>
+
+  <hr />
+
+  <ul>
+    <li>
+      <ul><li>List 1</li></ul>
+      <ul><li>List 2</li></ul>
+      <ul><li>List 3</li></ul>
+    </li>
+  </ul>
+</div>
+
+
+<!-- nesting -->
+<ol>
+  <ol>
+    <ol>
+      <ol>
+        <ol>
+          <li>lots of list containers</li>
+        </ol>
+      </ol>
+    </ol>
+  </ol>
+</ol>
+
+<hr />
+
+<ol>
+  <li>
+    <ol>
+      <li>
+        <ol>
+          <li>lots of list items</li>
+        </ol>
+      </li>
+    </ol>
+  </li>
+</ol>
+
+
+<!-- with other elements inside the list -->
+<ol>
+  <div>A 1 (div)</div>
+  A 2 (#text)
+  <li>A 3 (li)</li>
+  A 4 (#text)
+
+  <ol>
+    <li>B 1 (li)</li>
+    <ol>
+      <li>C 1 (li)</li>
+      <div>C 2 (div)</div>
+      <div>C 3 (div)</div>
+    </ol>
+   
+    <div>B 2 (div)</div>
+    <li>B 3 (li)</li>
+  </ol>
+</ol>
+
+
+<!-- with breaks -->
+<ul>
+  <li>
+      <p>Start Line</p>
+      <br /><br /><br />
+      <span> </span>
+      <br /><br /><br />
+      <p>End Line</p>
+  </li>
+  <li>
+    <p>
+      Start Line
+      <br /><br /><br />
+      <span> </span>
+      <br /><br /><br />
+      End Line
+    </p>
+  </li>
+</ul>
+
+
+<hr />
+
+
+<!-- with code block in item -->
+<ul>
+  <li>
+    item:
+    <pre>line 1
+line 2</pre>
+  </li>
+  <li>item 2</li>
+</ul>
+
+<!-- with code block in nested item -->
+<ul>
+  <li>
+    item 1:
+    <ul>
+      <li>
+        nested item 1:
+        <pre>line 1
+line 2</pre>
+      </li>
+      <li>nested item 2</li>
+    </ul>
+  </li>
+  <li>item 2</li>
+</ul>
+
+
+<hr />
+
+
+<!--------------------------------------
+            Special Characters
+--------------------------------------->
+
+<p>1.</p>
+<p>-</p>
+<p>+</p>
+<p>*</p>
+
+<hr />
+
+<p>1. not a list</p>
+<p>- not a list</p>
+<p>+ not a list</p>
+<p>* not a list</p>
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/list.md b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/list.md
new file mode 100644
index 0000000..0e87e8d
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/list.md
@@ -0,0 +1,223 @@
+A paragraph
+
+- 1
+- 2
+- - 3.1
+  - 3.2
+- 4 Before
+  
+  - 4.1
+  - 4.2
+- - 5.1
+  
+  5 After
+- 6 Before  
+  6 also Before
+  
+  - 6A.1
+  
+  6 Between
+  
+  - 6B.1
+  
+  6 After
+  
+  6 also After
+- 7
+
+* * *
+
+And also other lists...
+
+- First
+- Someone once said:
+  
+  > My famous quote
+  
+  \- someone
+
+<!--THE END-->
+
+09. Nine
+10. Ten
+11. 111. Eleven.A
+    112. Eleven.B
+12. Someone once said:
+    
+    > My famous quote
+    
+    \- someone
+13. Thirteen
+
+List Item without Container
+
+* * *
+
+<!-- list with blockquote that contains break -->
+
+1. > Line A  
+   > Line B
+
+* * *
+
+<!-- parsing the number fails -->
+
+1. one
+2. two
+
+* * *
+
+<!-- the max is one character: "9" -->
+
+8. a
+9. b
+
+<!--THE END-->
+
+<!-- the max is two characters: "10" -->
+
+09. a
+10. b
+
+* * *
+
+- Before text after
+- Before [text](/page) after
+
+* * *
+
+- A double `**` [can open strong emphasis](/page)
+
+* * *
+
+- List 1
+
+<!--THE END-->
+
+- List 2
+
+<!--THE END-->
+
+<!--THE END-->
+
+- List 3
+
+<!--THE END-->
+
+- List 4
+
+text between
+
+- List 5
+
+<!--THE END-->
+
+- List 6
+
+<!--THE END-->
+
+- List 7
+
+* * *
+
+- - List 1
+  
+  <!--THE END-->
+  
+  - List 2
+  
+  <!--THE END-->
+  
+  - List 3
+
+<!--THE END-->
+
+<!-- nesting -->
+
+1. 1. 1. 1. 1. lots of list containers
+
+* * *
+
+1. 1. 1. lots of list items
+
+<!--THE END-->
+
+<!-- with other elements inside the list -->
+
+1. A 1 (div)
+   
+   A 2 (#text)
+2. A 3 (li) A 4 (#text)
+   
+   1. B 1 (li)
+      
+      1. C 1 (li)
+         
+         C 2 (div)
+         
+         C 3 (div)
+      
+      B 2 (div)
+   2. B 3 (li)
+
+<!--THE END-->
+
+<!-- with breaks -->
+
+- Start Line
+  
+  End Line
+- Start Line
+  
+  End Line
+
+* * *
+
+<!-- with code block in item -->
+
+- item:
+  
+  ```
+  line 1
+  line 2
+  ```
+- item 2
+
+<!--THE END-->
+
+<!-- with code block in nested item -->
+
+- item 1:
+  
+  - nested item 1:
+    
+    ```
+    line 1
+    line 2
+    ```
+  - nested item 2
+- item 2
+
+* * *
+
+<!--------------------------------------
+            Special Characters
+--------------------------------------->
+
+1\.
+
+\-
+
+\+
+
+\*
+
+* * *
+
+1\. not a list
+
+\- not a list
+
+\+ not a list
+
+\* not a list
\ No newline at end of file
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/metadata.html b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/metadata.html
new file mode 100644
index 0000000..ac5b64e
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/metadata.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="UTF-8" />
+
+    <title>Page Title</title>
+  </head>
+  <body>
+    <h4>Heading A</h4>
+
+    <link href="/one.css" rel="stylesheet" />
+    <link href="/two.css" rel="stylesheet" />
+
+    <h4>Heading B</h4>
+
+    <hr />
+
+    <p>\a \* \\</p>
+
+    <p>
+      <span> .&lt;name&gt; </span>
+      <span> .< name >. </span>
+      <span> <</span><span>name</span><span>> </span>
+    </p>
+    <p>
+      2 > 1 <br/>
+      1 < 2 <br/>
+
+      A & B <br/>
+      A &amp; B <br/>
+      &amp;ouml;
+    </p>
+
+    <p>
+      *not emphasized* <br/>
+      &lt;br/&gt; not a tag <br/>
+      [not a link](/foo) <br/>
+      `not code` <br/>
+      1. not a list <br/>
+      * not a list <br/>
+      # not a heading <br/>
+      [foo]: /url &quot;not a reference&quot; <br/>
+      &amp;ouml; not a character entity
+    </p>
+
+
+    <p>
+      Start Line
+      <br /><br /><br />
+      <span> </span>
+      <br /><br /><br />
+      End Line
+    </p>
+  </body>
+</html>
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/metadata.md b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/metadata.md
new file mode 100644
index 0000000..67a27a4
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/commonmark/metadata.md
@@ -0,0 +1,29 @@
+#### Heading A
+
+#### Heading B
+
+* * *
+
+\\a \\* \\\\
+
+.&lt;name&gt; .&lt; name &gt;. &lt;name&gt;
+
+2 &gt; 1  
+1 &lt; 2  
+A & B  
+A & B  
+&ouml;
+
+\*not emphasized*  
+&lt;br/&gt; not a tag  
+\[not a link](/foo)  
+\`not code\`  
+1\. not a list  
+\* not a list  
+\# not a heading  
+\[foo]: /url "not a reference"  
+&ouml; not a character entity
+
+Start Line
+
+End Line
\ No newline at end of file
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/strikethrough/strikethrough.html b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/strikethrough/strikethrough.html
new file mode 100644
index 0000000..67cf8c0
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/strikethrough/strikethrough.html
@@ -0,0 +1,4 @@
+<del>strikethrough content</del>
+
+<p>~ </p>
+<p>* </p>
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/strikethrough/strikethrough.md b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/strikethrough/strikethrough.md
new file mode 100644
index 0000000..2815e2c
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/strikethrough/strikethrough.md
@@ -0,0 +1,5 @@
+~~strikethrough content~~
+
+~
+
+\*
\ No newline at end of file
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/basics.html b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/basics.html
new file mode 100644
index 0000000..c381ca5
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/basics.html
@@ -0,0 +1,234 @@
+<caption>
+  A caption outside a table
+</caption>
+
+<hr />
+
+<!-- empty tables -->
+<table></table>
+
+<table>
+  <tbody></tbody>
+</table>
+
+<table>
+  <caption>
+    The caption text of the empty table
+  </caption>
+  <thead></thead>
+  <tbody></tbody>
+</table>
+
+<table>
+  <tbody>
+    <tr></tr>
+    <tr></tr>
+  </tbody>
+</table>
+
+<hr />
+
+<!-- empty cells -->
+<table>
+  <tbody>
+    <tr>
+      <td></td>
+      <td></td>
+    </tr>
+    <tr>
+      <td></td>
+      <td></td>
+    </tr>
+  </tbody>
+</table>
+
+<table>
+  <tr>
+    <td></td>
+    <td>B1</td>
+  </tr>
+  <tr>
+    <td></td>
+    <td></td>
+  </tr>
+  <tr>
+    <td>A3</td>
+    <td></td>
+  </tr>
+</table>
+
+<hr />
+
+<!-- basic table -->
+<table>
+  <tr>
+    <td>A1</td>
+    <td>A2</td>
+  </tr>
+  <tr>
+    <td>B1</td>
+    <td>B2</td>
+  </tr>
+  <tr>
+    <td>C1</td>
+    <td>C2</td>
+  </tr>
+</table>
+
+<hr />
+
+<!-- just a heading row -->
+<table>
+  <thead>
+    <tr>
+      <th scope="col">Name</th>
+      <th scope="col">City</th>
+      <th scope="col">Age</th>
+    </tr>
+  </thead>
+</table>
+
+<hr />
+
+<!-- table with th (Table Header) element -->
+<table>
+  <tr>
+    <th>Company</th>
+    <th>Contact</th>
+    <th>Country</th>
+  </tr>
+  <tr>
+    <td>Company A</td>
+    <td>Max Mustermann</td>
+    <td>DE</td>
+  </tr>
+  <tr>
+    <td>Company B</td>
+    <td>John Doe</td>
+    <td>US</td>
+  </tr>
+</table>
+
+<hr />
+
+<!-- with thead and caption -->
+<table>
+  <caption>
+    A description about the
+    <code>table</code>
+  </caption>
+  <thead>
+    <tr>
+      <th scope="col">Name</th>
+      <th scope="col">City</th>
+      <th scope="col">Age</th>
+    </tr>
+  </thead>
+  <tbody>
+    <tr>
+      <th scope="row">Max Mustermann</th>
+      <td>Berlin</td>
+      <td>20</td>
+      <td>space for the note</td>
+    </tr>
+    <tr>
+      <th scope="row">Max Müller</th>
+      <td>München</td>
+      <td>30</td>
+    </tr>
+    <tr>
+      <th scope="row">Peter Mustermann</th>
+      <td>München</td>
+      <!-- no td -->
+    </tr>
+  </tbody>
+  <tfoot>
+    <tr>
+      <th scope="row" colspan="2">Average age</th>
+      <td>25</td>
+    </tr>
+  </tfoot>
+</table>
+
+<hr />
+
+<!-- with align -->
+<table>
+  <thead>
+    <tr>
+      <th align="left">Left</th>
+      <th align="center">Center</th>
+      <th align="right">Right</th>
+    </tr>
+  </thead>
+  <tbody>
+    <tr>
+      <td>A</td>
+      <td>B</td>
+      <td>C</td>
+    </tr>
+  </tbody>
+</table>
+
+<table>
+  <tr>
+    <td align="left">Left</td>
+    <td align="center">Center</td>
+    <td align="right">Right</td>
+  </tr>
+  <tr>
+    <td>A</td>
+    <td>B</td>
+    <td>C</td>
+  </tr>
+</table>
+
+<table>
+  <tr>
+    <td align="left"></td>
+    <td align="center"></td>
+    <td align="right"></td>
+  </tr>
+  <tr>
+    <td></td>
+    <td></td>
+    <td></td>
+  </tr>
+</table>
+
+<hr />
+
+<p>A | B</p>
+
+<!-- with special markdown characters -->
+<table>
+  <thead>
+    <tr>
+      <th>A (B) C</th>
+      <th>A **B** C</th>
+    </tr>
+  </thead>
+  <tbody>
+    <tr>
+      <th>A (B)</th>
+      <th>A *B*</th>
+    </tr>
+    <tr>
+      <th>A | B</th>
+    </tr>
+  </tbody>
+</table>
+
+<hr />
+
+<!-- skip table for role "presentation" -->
+<table role="presentation">
+  <tr>
+    <td>A1</td>
+    <td>A2</td>
+  </tr>
+  <tr>
+    <td>B1</td>
+    <td>B2</td>
+  </tr>
+</table>
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/basics.md b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/basics.md
new file mode 100644
index 0000000..3db6972
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/basics.md
@@ -0,0 +1,80 @@
+A caption outside a table
+
+* * *
+
+The caption text of the empty table
+
+* * *
+
+|   |   |
+|---|---|
+|   |   |
+|   |   |
+
+|    |    |
+|----|----|
+|    | B1 |
+|    |    |
+| A3 |    |
+
+* * *
+
+|    |    |
+|----|----|
+| A1 | A2 |
+| B1 | B2 |
+| C1 | C2 |
+
+* * *
+
+| Name | City | Age |
+|------|------|-----|
+
+* * *
+
+| Company   | Contact        | Country |
+|-----------|----------------|---------|
+| Company A | Max Mustermann | DE      |
+| Company B | John Doe       | US      |
+
+* * *
+
+| Name             | City    | Age |                    |
+|------------------|---------|-----|--------------------|
+| Max Mustermann   | Berlin  | 20  | space for the note |
+| Max Müller       | München | 30  |                    |
+| Peter Mustermann | München |     |                    |
+| Average age      |         | 25  |                    |
+
+A description about the `table`
+
+* * *
+
+| Left | Center | Right |
+|:-----|:------:|------:|
+| A    | B      | C     |
+
+|      |        |       |
+|:-----|:------:|------:|
+| Left | Center | Right |
+| A    | B      | C     |
+
+|   |   |   |
+|:--|:-:|--:|
+|   |   |   |
+|   |   |   |
+
+* * *
+
+A | B
+
+| A (B) C | A \*\*B\** C |
+|---------|--------------|
+| A (B)   | A \*B*       |
+| A \| B  |              |
+
+* * *
+
+A1 A2 
+
+B1 B2
\ No newline at end of file
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/col_row_span.html b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/col_row_span.html
new file mode 100644
index 0000000..578b0f3
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/col_row_span.html
@@ -0,0 +1,62 @@
+<!-- arguments -->
+<table>
+  <tr>
+    <td colspan="">A1</td>
+    <td colspan="x">B1</td>
+    <td colspan="-5">C1</td>
+  </tr>
+</table>
+
+<hr />
+
+<!-- colspan -->
+<table>
+  <tr>
+    <td colspan="2">wide cell</td>
+    <!-- here -->
+    <td>B1</td>
+  </tr>
+  <tr>
+    <td>A2</td>
+    <td>B2</td>
+    <td>C2</td>
+  </tr>
+</table>
+
+<!-- rowspan -->
+<table>
+  <tr>
+    <td rowspan="2">tall cell</td>
+    <td>B1</td>
+    <td>C1</td>
+  </tr>
+  <tr>
+    <!-- here -->
+    <td>A2</td>
+    <td>B2</td>
+  </tr>
+  <tr>
+    <td>A3</td>
+    <td>B3</td>
+    <td>C3</td>
+  </tr>
+</table>
+
+<!-- rowspan & colspan -->
+<table>
+  <tr>
+    <td rowspan="2" colspan="2">big cell</td>
+    <!-- here -->
+    <td>B1</td>
+  </tr>
+  <tr>
+    <!-- here -->
+    <!-- here -->
+    <td>A2</td>
+  </tr>
+  <tr>
+    <td>A3</td>
+    <td>B3</td>
+    <td>C3</td>
+  </tr>
+</table>
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/col_row_span.md b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/col_row_span.md
new file mode 100644
index 0000000..df42107
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/col_row_span.md
@@ -0,0 +1,22 @@
+|    |    |    |
+|----|----|----|
+| A1 | B1 | C1 |
+
+* * *
+
+|           |    |    |
+|-----------|----|----|
+| wide cell |    | B1 |
+| A2        | B2 | C2 |
+
+|           |    |    |
+|-----------|----|----|
+| tall cell | B1 | C1 |
+|           | A2 | B2 |
+| A3        | B3 | C3 |
+
+|          |    |    |
+|----------|----|----|
+| big cell |    | B1 |
+|          |    | A2 |
+| A3       | B3 | C3 |
\ No newline at end of file
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/contents.html b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/contents.html
new file mode 100644
index 0000000..d7661e1
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/contents.html
@@ -0,0 +1,164 @@
+<!-- basic table with inline content -->
+<table>
+  <tr>
+    <td>
+      <strong>A1</strong>
+    </td>
+    <td>
+      <i>B1</i>
+    </td>
+  </tr>
+  <tr>
+    <td>
+      <code>A2</code>
+    </td>
+    <td>
+      <a href="/">B2</a>
+    </td>
+  </tr>
+</table>
+
+<hr />
+
+<table>
+  <tr>
+    <td>
+      with break after
+      <br />
+    </td>
+  </tr>
+  <tr>
+    <td>
+      <br />
+      with break before
+    </td>
+  </tr>
+  <tr>
+    <td>
+      <br /><br /><br />
+      with break around
+      <br /><br /><br />
+    </td>
+  </tr>
+</table>
+
+<hr />
+<!-- yes: we can keep rendering a table (even though it contains a block node) -->
+
+<table>
+  <tr>
+    <td><p>Some normal content</p></td>
+  </tr>
+</table>
+
+<table>
+  <tr>
+    <td><div>Some normal content</div></td>
+  </tr>
+</table>
+
+<table>
+  <tr>
+    <td>
+      <article>
+        <p>Some normal content</p>
+      </article>
+    </td>
+  </tr>
+</table>
+
+<hr />
+<!-- no: we cannot keep rendering a table -->
+
+<table>
+  <tr>
+    <td>The content<br />with break</td>
+  </tr>
+</table>
+
+<table>
+  <tr>
+    <td><h1>Heading</h1></td>
+  </tr>
+</table>
+
+<table>
+  <tr>
+    <td><h1></h1></td>
+    <td>not the empty heading</td>
+  </tr>
+</table>
+
+<table>
+  <tr>
+    <td><hr /></td>
+  </tr>
+</table>
+
+<table>
+  <tr>
+    <td>
+      <pre>Code block</pre>
+    </td>
+  </tr>
+</table>
+
+<table>
+  <tr>
+    <td>
+      <blockquote>Blockquote</blockquote>
+    </td>
+  </tr>
+</table>
+
+<table>
+  <tr>
+    <td>
+      <ul>
+        <li>Unordered List</li>
+      </ul>
+    </td>
+  </tr>
+</table>
+
+<table>
+  <tr>
+    <td>
+      <ol>
+        <li>Ordered List</li>
+      </ol>
+    </td>
+  </tr>
+</table>
+
+<hr />
+
+<!-- nested table #1 -->
+<table>
+  <tr>
+    <td>
+      <table>
+        <tr>
+          <td>Nested Table</td>
+        </tr>
+      </table>
+    </td>
+  </tr>
+</table>
+
+<hr />
+
+<!-- nested table #2 -->
+<table>
+  <tr>
+    <td>Other cell</td>
+    <td>
+      <table>
+        <tr>
+          <td>Nested Table</td>
+        </tr>
+      </table>
+    </td>
+    <td>Another cell</td>
+  </tr>
+</table>
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/contents.md b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/contents.md
new file mode 100644
index 0000000..dbf7274
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/contents.md
@@ -0,0 +1,65 @@
+|        |         |
+|--------|---------|
+| **A1** | *B1*    |
+| `A2`   | [B2](/) |
+
+* * *
+
+|                   |
+|-------------------|
+| with break after  |
+| with break before |
+| with break around |
+
+* * *
+
+|                     |
+|---------------------|
+| Some normal content |
+
+|                     |
+|---------------------|
+| Some normal content |
+
+|                     |
+|---------------------|
+| Some normal content |
+
+* * *
+
+The content  
+with break
+
+# Heading
+
+not the empty heading
+
+* * *
+
+```
+Code block
+```
+
+> Blockquote
+
+- Unordered List
+
+<!--THE END-->
+
+1. Ordered List
+
+* * *
+
+|              |
+|--------------|
+| Nested Table |
+
+* * *
+
+Other cell
+
+|              |
+|--------------|
+| Nested Table |
+
+Another cell
\ No newline at end of file
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/email.html b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/email.html
new file mode 100644
index 0000000..a3a01bc
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/email.html
@@ -0,0 +1,248 @@
+<!DOCTYPE html>
+<html>
+  <body>
+    <div style="">
+      <!--[if mso | IE]><table align="center" border="0" cellpadding="0" cellspacing="0" class="" style="width:600px;" width="600" ><tr><td style="line-height:0px;font-size:0px;mso-line-height-rule:exactly;"><![endif]-->
+      <div style="margin: 0px auto; max-width: 600px">
+        <table
+          align="center"
+          border="0"
+          cellpadding="0"
+          cellspacing="0"
+          role="presentation"
+          style="width: 100%"
+        >
+          <tbody>
+            <tr>
+              <td
+                style="
+                  direction: ltr;
+                  font-size: 0px;
+                  padding: 20px 0;
+                  text-align: center;
+                "
+              >
+                <!--[if mso | IE]><table role="presentation" border="0" cellpadding="0" cellspacing="0"><tr><td class="" style="vertical-align:top;width:600px;" ><![endif]-->
+                <div
+                  class="mj-column-per-100 mj-outlook-group-fix"
+                  style="
+                    font-size: 0px;
+                    text-align: left;
+                    direction: ltr;
+                    display: inline-block;
+                    vertical-align: top;
+                    width: 100%;
+                  "
+                >
+                  <table
+                    border="0"
+                    cellpadding="0"
+                    cellspacing="0"
+                    role="presentation"
+                    style="vertical-align: top"
+                    width="100%"
+                  >
+                    <tbody>
+                      <tr>
+                        <td
+                          align="center"
+                          style="
+                            font-size: 0px;
+                            padding: 10px 25px;
+                            word-break: break-word;
+                          "
+                        >
+                          <table
+                            border="0"
+                            cellpadding="0"
+                            cellspacing="0"
+                            role="presentation"
+                            style="
+                              border-collapse: collapse;
+                              border-spacing: 0px;
+                            "
+                          >
+                            <tbody>
+                              <tr>
+                                <td style="width: 100px">
+                                  <img
+                                    height="auto"
+                                    src="/assets/picture.png"
+                                    style="
+                                      border: 0;
+                                      display: block;
+                                      outline: none;
+                                      text-decoration: none;
+                                      height: auto;
+                                      width: 100%;
+                                      font-size: 13px;
+                                    "
+                                    width="100"
+                                  />
+                                </td>
+                              </tr>
+                            </tbody>
+                          </table>
+                        </td>
+                      </tr>
+                      <tr>
+                        <td
+                          align="center"
+                          style="
+                            font-size: 0px;
+                            padding: 10px 25px;
+                            word-break: break-word;
+                          "
+                        >
+                          <p
+                            style="
+                              border-top: solid 4px red;
+                              font-size: 1px;
+                              margin: 0px auto;
+                              width: 100%;
+                            "
+                          ></p>
+                          <!--[if mso | IE
+                            ]><table
+                              align="center"
+                              border="0"
+                              cellpadding="0"
+                              cellspacing="0"
+                              style="
+                                border-top: solid 4px red;
+                                font-size: 1px;
+                                margin: 0px auto;
+                                width: 550px;
+                              "
+                              role="presentation"
+                              width="550px"
+                            >
+                              <tr>
+                                <td style="height: 0; line-height: 0">
+                                  &nbsp;
+                                </td>
+                              </tr>
+                            </table><!
+                          [endif]-->
+                        </td>
+                      </tr>
+                      <tr>
+                        <td
+                          align="left"
+                          style="
+                            font-size: 0px;
+                            padding: 10px 25px;
+                            word-break: break-word;
+                          "
+                        >
+                          <div
+                            style="
+                              font-family: Ubuntu, Helvetica, Arial, sans-serif;
+                              font-size: 13px;
+                              line-height: 1;
+                              text-align: left;
+                              color: #000000;
+                            "
+                          >
+                            normal body content
+                          </div>
+                        </td>
+                      </tr>
+                    </tbody>
+                  </table>
+                </div>
+                <!--[if mso | IE]></td></tr></table><![endif]-->
+              </td>
+            </tr>
+          </tbody>
+        </table>
+      </div>
+      <!--[if mso | IE]></td></tr></table><table align="center" border="0" cellpadding="0" cellspacing="0" class="" style="width:600px;" width="600" ><tr><td style="line-height:0px;font-size:0px;mso-line-height-rule:exactly;"><![endif]-->
+      <div style="margin: 0px auto; max-width: 600px">
+        <table
+          align="center"
+          border="0"
+          cellpadding="0"
+          cellspacing="0"
+          role="presentation"
+          style="width: 100%"
+        >
+          <tbody>
+            <tr>
+              <td
+                style="
+                  direction: ltr;
+                  font-size: 0px;
+                  padding: 20px 0;
+                  text-align: center;
+                "
+              >
+                <!--[if mso | IE]><table role="presentation" border="0" cellpadding="0" cellspacing="0"><tr><td class="" style="vertical-align:top;width:600px;" ><![endif]-->
+                <div
+                  class="mj-column-per-100 mj-outlook-group-fix"
+                  style="
+                    font-size: 0px;
+                    text-align: left;
+                    direction: ltr;
+                    display: inline-block;
+                    vertical-align: top;
+                    width: 100%;
+                  "
+                >
+                  <table
+                    border="0"
+                    cellpadding="0"
+                    cellspacing="0"
+                    role="presentation"
+                    style="vertical-align: top"
+                    width="100%"
+                  >
+                    <tbody>
+                      <tr>
+                        <td
+                          align="left"
+                          style="
+                            font-size: 0px;
+                            padding: 10px 25px;
+                            word-break: break-word;
+                          "
+                        >
+                          <table
+                            cellpadding="0"
+                            cellspacing="0"
+                            width="100%"
+                            border="0"
+                            style="
+                              color: #000000;
+                              font-family: Ubuntu, Helvetica, Arial, sans-serif;
+                              font-size: 13px;
+                              line-height: 22px;
+                              table-layout: auto;
+                              width: 100%;
+                              border: none;
+                            "
+                          >
+                            <tr>
+                              <th>A1</th>
+                              <th>A2</th>
+                            </tr>
+                            <tr>
+                              <td>B1</td>
+                              <td>B2</td>
+                            </tr>
+                          </table>
+                        </td>
+                      </tr>
+                    </tbody>
+                  </table>
+                </div>
+                <!--[if mso | IE]></td></tr></table><![endif]-->
+              </td>
+            </tr>
+          </tbody>
+        </table>
+      </div>
+      <!--[if mso | IE]></td></tr></table><![endif]-->
+    </div>
+  </body>
+</html>
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/email.md b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/email.md
new file mode 100644
index 0000000..c8c5718
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/email.md
@@ -0,0 +1,7 @@
+![](/assets/picture.png)
+
+normal body content
+
+| A1 | A2 |
+|----|----|
+| B1 | B2 |
\ No newline at end of file
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/parents.html b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/parents.html
new file mode 100644
index 0000000..2fb0f77
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/parents.html
@@ -0,0 +1,110 @@
+<!-- these parents do work -->
+
+<blockquote>
+  The blockquote content:
+
+  <table>
+    <tr>
+      <td>A1</td>
+      <td>A2</td>
+    </tr>
+  </table>
+</blockquote>
+
+<hr />
+
+<ol start="10">
+  <li>The list item content</li>
+  <li>
+    <table>
+      <tr>
+        <td>A1</td>
+        <td>A2</td>
+      </tr>
+    </table>
+  </li>
+</ol>
+
+<div>
+  <span>
+    <table>
+      <tr>
+        <td>A1</td>
+        <td>A2</td>
+      </tr>
+    </table>
+  </span>
+</div>
+
+<hr />
+
+<!-- these parents unfortunately do NOT work (unless you reorder the nodes) -->
+
+<a href="/link">
+  link content before
+  <table>
+    <tr>
+      <td>A1</td>
+      <td>A2</td>
+    </tr>
+  </table>
+  link content after
+</a>
+
+<hr />
+
+<a href="/link">
+  <div>
+    <blockquote>
+      <table>
+        <tr>
+          <td>A1</td>
+          <td>A2</td>
+        </tr>
+      </table>
+    </blockquote>
+  </div>
+</a>
+
+<hr />
+
+<strong>
+  bold content before
+  <table>
+    <tr>
+      <td>A1</td>
+      <td>A2</td>
+    </tr>
+  </table>
+  bold content after
+</strong>
+
+<hr />
+
+<i>
+  <span>italic content before</span>
+  <blockquote>
+    blockquote content before
+    <table>
+      <tr>
+        <td>A1</td>
+        <td>A2</td>
+      </tr>
+    </table>
+    blockquote content after
+  </blockquote>
+  <span>italic content after</span>
+</i>
+
+<hr />
+
+<button>
+  button content before
+  <table>
+    <tr>
+      <td>A1</td>
+      <td>A2</td>
+    </tr>
+  </table>
+  button content after
+</button>
diff --git a/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/parents.md b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/parents.md
new file mode 100644
index 0000000..79e7f22
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/johanneskaufmann-html-to-markdown/table/parents.md
@@ -0,0 +1,58 @@
+> The blockquote content:
+> 
+> |    |    |
+> |----|----|
+> | A1 | A2 |
+
+* * *
+
+10. The list item content
+11. |    |    |
+    |----|----|
+    | A1 | A2 |
+
+|    |    |
+|----|----|
+| A1 | A2 |
+
+* * *
+
+[link content before  
+\
+A1 A2  
+\
+link content after](/link)
+
+* * *
+
+["  
+\
+A1 A2  
+\
+"](/link)
+
+* * *
+
+**bold content before**
+
+**A1 A2**
+
+**bold content after**
+
+* * *
+
+*italic content before " blockquote content before*
+
+*A1 A2*
+
+*blockquote content after " italic content after*
+
+* * *
+
+button content before
+
+|    |    |
+|----|----|
+| A1 | A2 |
+
+button content after
\ No newline at end of file
diff --git a/tests/files/thirdPartyFixtures/go/upstream_path_map.json b/tests/files/thirdPartyFixtures/go/upstream_path_map.json
new file mode 100644
index 0000000..bc3ab67
--- /dev/null
+++ b/tests/files/thirdPartyFixtures/go/upstream_path_map.json
@@ -0,0 +1,30 @@
+{
+  "go/johanneskaufmann-html-to-markdown/commonmark/blockquote.html": "plugin/commonmark/testdata/GoldenFiles/blockquote.in.html",
+  "go/johanneskaufmann-html-to-markdown/commonmark/blockquote.md": "plugin/commonmark/testdata/GoldenFiles/blockquote.out.md",
+  "go/johanneskaufmann-html-to-markdown/commonmark/bold.html": "plugin/commonmark/testdata/GoldenFiles/bold.in.html",
+  "go/johanneskaufmann-html-to-markdown/commonmark/bold.md": "plugin/commonmark/testdata/GoldenFiles/bold.out.md",
+  "go/johanneskaufmann-html-to-markdown/commonmark/code.html": "plugin/commonmark/testdata/GoldenFiles/code.in.html",
+  "go/johanneskaufmann-html-to-markdown/commonmark/code.md": "plugin/commonmark/testdata/GoldenFiles/code.out.md",
+  "go/johanneskaufmann-html-to-markdown/commonmark/heading.html": "plugin/commonmark/testdata/GoldenFiles/heading.in.html",
+  "go/johanneskaufmann-html-to-markdown/commonmark/heading.md": "plugin/commonmark/testdata/GoldenFiles/heading.out.md",
+  "go/johanneskaufmann-html-to-markdown/commonmark/image.html": "plugin/commonmark/testdata/GoldenFiles/image.in.html",
+  "go/johanneskaufmann-html-to-markdown/commonmark/image.md": "plugin/commonmark/testdata/GoldenFiles/image.out.md",
+  "go/johanneskaufmann-html-to-markdown/commonmark/link.html": "plugin/commonmark/testdata/GoldenFiles/link.in.html",
+  "go/johanneskaufmann-html-to-markdown/commonmark/link.md": "plugin/commonmark/testdata/GoldenFiles/link.out.md",
+  "go/johanneskaufmann-html-to-markdown/commonmark/list.html": "plugin/commonmark/testdata/GoldenFiles/list.in.html",
+  "go/johanneskaufmann-html-to-markdown/commonmark/list.md": "plugin/commonmark/testdata/GoldenFiles/list.out.md",
+  "go/johanneskaufmann-html-to-markdown/commonmark/metadata.html": "plugin/commonmark/testdata/GoldenFiles/metadata.in.html",
+  "go/johanneskaufmann-html-to-markdown/commonmark/metadata.md": "plugin/commonmark/testdata/GoldenFiles/metadata.out.md",
+  "go/johanneskaufmann-html-to-markdown/strikethrough/strikethrough.html": "plugin/strikethrough/testdata/GoldenFiles/strikethrough.in.html",
+  "go/johanneskaufmann-html-to-markdown/strikethrough/strikethrough.md": "plugin/strikethrough/testdata/GoldenFiles/strikethrough.out.md",
+  "go/johanneskaufmann-html-to-markdown/table/basics.html": "plugin/table/testdata/GoldenFiles/basics.in.html",
+  "go/johanneskaufmann-html-to-markdown/table/basics.md": "plugin/table/testdata/GoldenFiles/basics.out.md",
+  "go/johanneskaufmann-html-to-markdown/table/col_row_span.html": "plugin/table/testdata/GoldenFiles/col_row_span.in.html",
+  "go/johanneskaufmann-html-to-markdown/table/col_row_span.md": "plugin/table/testdata/GoldenFiles/col_row_span.out.md",
+  "go/johanneskaufmann-html-to-markdown/table/contents.html": "plugin/table/testdata/GoldenFiles/contents.in.html",
+  "go/johanneskaufmann-html-to-markdown/table/contents.md": "plugin/table/testdata/GoldenFiles/contents.out.md",
+  "go/johanneskaufmann-html-to-markdown/table/email.html": "plugin/table/testdata/GoldenFiles/email.in.html",
+  "go/johanneskaufmann-html-to-markdown/table/email.md": "plugin/table/testdata/GoldenFiles/email.out.md",
+  "go/johanneskaufmann-html-to-markdown/table/parents.html": "plugin/table/testdata/GoldenFiles/parents.in.html",
+  "go/johanneskaufmann-html-to-markdown/table/parents.md": "plugin/table/testdata/GoldenFiles/parents.out.md"
+}