diff --git a/css/definitions.json b/css/definitions.json
index c72888b4..6fc1b7ca 100644
--- a/css/definitions.json
+++ b/css/definitions.json
@@ -57,6 +57,7 @@
       "CSS Types",
       "CSS Units",
       "CSS View Transitions",
+      "CSS Viewport",
       "CSS Will Change",
       "CSS Writing Modes",
       "CSSOM View",
@@ -64,7 +65,6 @@
       "Grouping Selectors",
       "MathML",
       "Media Queries",
-      "Microsoft Extensions",
       "Mozilla Extensions",
       "Pointer Events",
       "Pseudo",
diff --git a/css/properties.json b/css/properties.json
index 91937d3b..5cf58b73 100644
--- a/css/properties.json
+++ b/css/properties.json
@@ -15,763 +15,6 @@
     "status": "standard",
     "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/--*"
   },
-  "-ms-accelerator": {
-    "syntax": "false | true",
-    "media": "visual",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "false",
-    "appliesto": "allElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-block-progression": {
-    "syntax": "tb | rl | bt | lr",
-    "media": "visual",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "tb",
-    "appliesto": "allElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-content-zoom-chaining": {
-    "syntax": "none | chained",
-    "media": "interactive",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "none",
-    "appliesto": "nonReplacedBlockAndInlineBlockElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-content-zoom-limit": {
-    "syntax": "<'-ms-content-zoom-limit-min'> <'-ms-content-zoom-limit-max'>",
-    "media": "interactive",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": [
-      "-ms-content-zoom-limit-max",
-      "-ms-content-zoom-limit-min"
-    ],
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": [
-      "-ms-content-zoom-limit-max",
-      "-ms-content-zoom-limit-min"
-    ],
-    "appliesto": "nonReplacedBlockAndInlineBlockElements",
-    "computed": [
-      "-ms-content-zoom-limit-max",
-      "-ms-content-zoom-limit-min"
-    ],
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-content-zoom-limit-max": {
-    "syntax": "<percentage>",
-    "media": "interactive",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "maxZoomFactor",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "400%",
-    "appliesto": "nonReplacedBlockAndInlineBlockElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-content-zoom-limit-min": {
-    "syntax": "<percentage>",
-    "media": "interactive",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "minZoomFactor",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "100%",
-    "appliesto": "nonReplacedBlockAndInlineBlockElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-content-zoom-snap": {
-    "syntax": "<'-ms-content-zoom-snap-type'> || <'-ms-content-zoom-snap-points'>",
-    "media": "interactive",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": [
-      "-ms-content-zoom-snap-type",
-      "-ms-content-zoom-snap-points"
-    ],
-    "appliesto": "nonReplacedBlockAndInlineBlockElements",
-    "computed": [
-      "-ms-content-zoom-snap-type",
-      "-ms-content-zoom-snap-points"
-    ],
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-content-zoom-snap-points": {
-    "syntax": "snapInterval( <percentage>, <percentage> ) | snapList( <percentage># )",
-    "media": "interactive",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "snapInterval(0%, 100%)",
-    "appliesto": "nonReplacedBlockAndInlineBlockElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-content-zoom-snap-type": {
-    "syntax": "none | proximity | mandatory",
-    "media": "interactive",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "none",
-    "appliesto": "nonReplacedBlockAndInlineBlockElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-content-zooming": {
-    "syntax": "none | zoom",
-    "media": "interactive",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "zoomForTheTopLevelNoneForTheRest",
-    "appliesto": "nonReplacedBlockAndInlineBlockElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-filter": {
-    "syntax": "<string>",
-    "media": "visual",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "\"\"",
-    "appliesto": "allElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-flow-from": {
-    "syntax": "[ none | <custom-ident> ]#",
-    "media": "visual",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "none",
-    "appliesto": "nonReplacedElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-flow-into": {
-    "syntax": "[ none | <custom-ident> ]#",
-    "media": "visual",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "none",
-    "appliesto": "iframeElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-grid-columns": {
-    "syntax": "none | <track-list> | <auto-track-list>",
-    "media": "visual",
-    "inherited": false,
-    "animationType": "simpleListOfLpcDifferenceLpc",
-    "percentages": "referToDimensionOfContentArea",
-    "groups": [
-      "CSS Grid Layout"
-    ],
-    "initial": "none",
-    "appliesto": "gridContainers",
-    "computed": "asSpecifiedRelativeToAbsoluteLengths",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-grid-rows": {
-    "syntax": "none | <track-list> | <auto-track-list>",
-    "media": "visual",
-    "inherited": false,
-    "animationType": "simpleListOfLpcDifferenceLpc",
-    "percentages": "referToDimensionOfContentArea",
-    "groups": [
-      "CSS Grid Layout"
-    ],
-    "initial": "none",
-    "appliesto": "gridContainers",
-    "computed": "asSpecifiedRelativeToAbsoluteLengths",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-high-contrast-adjust": {
-    "syntax": "auto | none",
-    "media": "visual",
-    "inherited": true,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "auto",
-    "appliesto": "allElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-hyphenate-limit-chars": {
-    "syntax": "auto | <integer>{1,3}",
-    "media": "visual",
-    "inherited": true,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "auto",
-    "appliesto": "allElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-hyphenate-limit-lines": {
-    "syntax": "no-limit | <integer>",
-    "media": "visual",
-    "inherited": true,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "no-limit",
-    "appliesto": "blockContainerElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-hyphenate-limit-zone": {
-    "syntax": "<percentage> | <length>",
-    "media": "visual",
-    "inherited": true,
-    "animationType": "discrete",
-    "percentages": "referToLineBoxWidth",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "0",
-    "appliesto": "blockContainerElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-ime-align": {
-    "syntax": "auto | after",
-    "media": "visual",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "auto",
-    "appliesto": "allElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-overflow-style": {
-    "syntax": "auto | none | scrollbar | -ms-autohiding-scrollbar",
-    "media": "interactive",
-    "inherited": true,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "auto",
-    "appliesto": "nonReplacedBlockAndInlineBlockElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-scroll-chaining": {
-    "syntax": "chained | none",
-    "media": "interactive",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "chained",
-    "appliesto": "nonReplacedBlockAndInlineBlockElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-scroll-limit": {
-    "syntax": "<'-ms-scroll-limit-x-min'> <'-ms-scroll-limit-y-min'> <'-ms-scroll-limit-x-max'> <'-ms-scroll-limit-y-max'>",
-    "media": "interactive",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": [
-      "-ms-scroll-limit-x-min",
-      "-ms-scroll-limit-y-min",
-      "-ms-scroll-limit-x-max",
-      "-ms-scroll-limit-y-max"
-    ],
-    "appliesto": "nonReplacedBlockAndInlineBlockElements",
-    "computed": [
-      "-ms-scroll-limit-x-min",
-      "-ms-scroll-limit-y-min",
-      "-ms-scroll-limit-x-max",
-      "-ms-scroll-limit-y-max"
-    ],
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-scroll-limit-x-max": {
-    "syntax": "auto | <length>",
-    "media": "interactive",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "auto",
-    "appliesto": "nonReplacedBlockAndInlineBlockElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-scroll-limit-x-min": {
-    "syntax": "<length>",
-    "media": "interactive",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "0",
-    "appliesto": "nonReplacedBlockAndInlineBlockElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-scroll-limit-y-max": {
-    "syntax": "auto | <length>",
-    "media": "interactive",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "auto",
-    "appliesto": "nonReplacedBlockAndInlineBlockElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-scroll-limit-y-min": {
-    "syntax": "<length>",
-    "media": "interactive",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "0",
-    "appliesto": "nonReplacedBlockAndInlineBlockElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-scroll-rails": {
-    "syntax": "none | railed",
-    "media": "interactive",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "railed",
-    "appliesto": "nonReplacedBlockAndInlineBlockElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-scroll-snap-points-x": {
-    "syntax": "snapInterval( <length-percentage>, <length-percentage> ) | snapList( <length-percentage># )",
-    "media": "interactive",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "snapInterval(0px, 100%)",
-    "appliesto": "nonReplacedBlockAndInlineBlockElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-scroll-snap-points-y": {
-    "syntax": "snapInterval( <length-percentage>, <length-percentage> ) | snapList( <length-percentage># )",
-    "media": "interactive",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "snapInterval(0px, 100%)",
-    "appliesto": "nonReplacedBlockAndInlineBlockElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-scroll-snap-type": {
-    "syntax": "none | proximity | mandatory",
-    "media": "interactive",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "none",
-    "appliesto": "nonReplacedBlockAndInlineBlockElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-scroll-snap-x": {
-    "syntax": "<'-ms-scroll-snap-type'> <'-ms-scroll-snap-points-x'>",
-    "media": "interactive",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": [
-      "-ms-scroll-snap-type",
-      "-ms-scroll-snap-points-x"
-    ],
-    "appliesto": "nonReplacedBlockAndInlineBlockElements",
-    "computed": [
-      "-ms-scroll-snap-type",
-      "-ms-scroll-snap-points-x"
-    ],
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-scroll-snap-y": {
-    "syntax": "<'-ms-scroll-snap-type'> <'-ms-scroll-snap-points-y'>",
-    "media": "interactive",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": [
-      "-ms-scroll-snap-type",
-      "-ms-scroll-snap-points-y"
-    ],
-    "appliesto": "nonReplacedBlockAndInlineBlockElements",
-    "computed": [
-      "-ms-scroll-snap-type",
-      "-ms-scroll-snap-points-y"
-    ],
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-scroll-translation": {
-    "syntax": "none | vertical-to-horizontal",
-    "media": "interactive",
-    "inherited": true,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "none",
-    "appliesto": "allElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-scrollbar-3dlight-color": {
-    "syntax": "<color>",
-    "media": "visual",
-    "inherited": true,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "dependsOnUserAgent",
-    "appliesto": "allElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-scrollbar-arrow-color": {
-    "syntax": "<color>",
-    "media": "visual",
-    "inherited": true,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "ButtonText",
-    "appliesto": "allElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-scrollbar-base-color": {
-    "syntax": "<color>",
-    "media": "visual",
-    "inherited": true,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "dependsOnUserAgent",
-    "appliesto": "allElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-scrollbar-darkshadow-color": {
-    "syntax": "<color>",
-    "media": "visual",
-    "inherited": true,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "ThreeDDarkShadow",
-    "appliesto": "allElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-scrollbar-face-color": {
-    "syntax": "<color>",
-    "media": "visual",
-    "inherited": true,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "ThreeDFace",
-    "appliesto": "allElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-scrollbar-highlight-color": {
-    "syntax": "<color>",
-    "media": "visual",
-    "inherited": true,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "ThreeDHighlight",
-    "appliesto": "allElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-scrollbar-shadow-color": {
-    "syntax": "<color>",
-    "media": "visual",
-    "inherited": true,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "ThreeDDarkShadow",
-    "appliesto": "allElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-scrollbar-track-color": {
-    "syntax": "<color>",
-    "media": "visual",
-    "inherited": true,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "Scrollbar",
-    "appliesto": "allElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-text-autospace": {
-    "syntax": "none | ideograph-alpha | ideograph-numeric | ideograph-parenthesis | ideograph-space",
-    "media": "visual",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "none",
-    "appliesto": "allElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-touch-select": {
-    "syntax": "grippers | none",
-    "media": "interactive",
-    "inherited": true,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "grippers",
-    "appliesto": "allElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-user-select": {
-    "syntax": "none | element | text",
-    "media": "interactive",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "text",
-    "appliesto": "nonReplacedElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-wrap-flow": {
-    "syntax": "auto | both | start | end | maximum | clear",
-    "media": "visual",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "auto",
-    "appliesto": "blockLevelElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-wrap-margin": {
-    "syntax": "<length>",
-    "media": "visual",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "0",
-    "appliesto": "exclusionElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
-  "-ms-wrap-through": {
-    "syntax": "wrap | none",
-    "media": "visual",
-    "inherited": false,
-    "animationType": "discrete",
-    "percentages": "no",
-    "groups": [
-      "Microsoft Extensions"
-    ],
-    "initial": "wrap",
-    "appliesto": "blockLevelElements",
-    "computed": "asSpecified",
-    "order": "uniqueOrder",
-    "status": "nonstandard"
-  },
   "-moz-appearance": {
     "syntax": "none | button | button-arrow-down | button-arrow-next | button-arrow-previous | button-arrow-up | button-bevel | button-focus | caret | checkbox | checkbox-container | checkbox-label | checkmenuitem | dualbutton | groupbox | listbox | listitem | menuarrow | menubar | menucheckbox | menuimage | menuitem | menuitemtext | menulist | menulist-button | menulist-text | menulist-textfield | menupopup | menuradio | menuseparator | meterbar | meterchunk | progressbar | progressbar-vertical | progresschunk | progresschunk-vertical | radio | radio-container | radio-label | radiomenuitem | range | range-thumb | resizer | resizerpanel | scale-horizontal | scalethumbend | scalethumb-horizontal | scalethumbstart | scalethumbtick | scalethumb-vertical | scale-vertical | scrollbarbutton-down | scrollbarbutton-left | scrollbarbutton-right | scrollbarbutton-up | scrollbarthumb-horizontal | scrollbarthumb-vertical | scrollbartrack-horizontal | scrollbartrack-vertical | searchfield | separator | sheet | spinner | spinner-downbutton | spinner-textfield | spinner-upbutton | splitter | statusbar | statusbarpanel | tab | tabpanel | tabpanels | tab-scroll-arrow-back | tab-scroll-arrow-forward | textfield | textfield-multiline | toolbar | toolbarbutton | toolbarbutton-dropdown | toolbargripper | toolbox | tooltip | treeheader | treeheadercell | treeheadersortarrow | treeitem | treeline | treetwisty | treetwistyopen | treeview | -moz-mac-unified-toolbar | -moz-win-borderless-glass | -moz-win-browsertabbar-toolbox | -moz-win-communicationstext | -moz-win-communications-toolbox | -moz-win-exclude-glass | -moz-win-glass | -moz-win-mediatext | -moz-win-media-toolbox | -moz-window-button-box | -moz-window-button-box-maximized | -moz-window-button-close | -moz-window-button-maximize | -moz-window-button-minimize | -moz-window-button-restore | -moz-window-frame-bottom | -moz-window-frame-left | -moz-window-frame-right | -moz-window-titlebar | -moz-window-titlebar-maximized",
     "media": "visual",
@@ -10853,7 +10096,7 @@
     "animationType": "notAnimatable",
     "percentages": "no",
     "groups": [
-      "Microsoft Extensions"
+      "CSS Viewport"
     ],
     "initial": "normal",
     "appliesto": "allElements",
diff --git a/css/selectors.json b/css/selectors.json
index 51c283e5..549049d2 100644
--- a/css/selectors.json
+++ b/css/selectors.json
@@ -782,132 +782,6 @@
     ],
     "status": "experimental"
   },
-  "::-ms-browse": {
-    "syntax": "::-ms-browse",
-    "groups": [
-      "Pseudo-elements",
-      "Selectors",
-      "Microsoft Extensions"
-    ],
-    "status": "nonstandard"
-  },
-  "::-ms-check": {
-    "syntax": "::-ms-check",
-    "groups": [
-      "Pseudo-elements",
-      "Selectors",
-      "Microsoft Extensions"
-    ],
-    "status": "nonstandard"
-  },
-  "::-ms-clear": {
-    "syntax": "::-ms-clear",
-    "groups": [
-      "Pseudo-elements",
-      "Selectors",
-      "Microsoft Extensions"
-    ],
-    "status": "nonstandard"
-  },
-  "::-ms-expand": {
-    "syntax": "::-ms-expand",
-    "groups": [
-      "Pseudo-elements",
-      "Selectors",
-      "Microsoft Extensions"
-    ],
-    "status": "nonstandard"
-  },
-  "::-ms-fill": {
-    "syntax": "::-ms-fill",
-    "groups": [
-      "Pseudo-elements",
-      "Selectors",
-      "Microsoft Extensions"
-    ],
-    "status": "nonstandard"
-  },
-  "::-ms-fill-lower": {
-    "syntax": "::-ms-fill-lower",
-    "groups": [
-      "Pseudo-elements",
-      "Selectors",
-      "Microsoft Extensions"
-    ],
-    "status": "nonstandard"
-  },
-  "::-ms-fill-upper": {
-    "syntax": "::-ms-fill-upper",
-    "groups": [
-      "Pseudo-elements",
-      "Selectors",
-      "Microsoft Extensions"
-    ],
-    "status": "nonstandard"
-  },
-  "::-ms-reveal": {
-    "syntax": "::-ms-reveal",
-    "groups": [
-      "Pseudo-elements",
-      "Selectors",
-      "Microsoft Extensions"
-    ],
-    "status": "nonstandard"
-  },
-  "::-ms-thumb": {
-    "syntax": "::-ms-thumb",
-    "groups": [
-      "Pseudo-elements",
-      "Selectors",
-      "Microsoft Extensions"
-    ],
-    "status": "nonstandard"
-  },
-  "::-ms-ticks-after": {
-    "syntax": "::-ms-ticks-after",
-    "groups": [
-      "Pseudo-elements",
-      "Selectors",
-      "Microsoft Extensions"
-    ],
-    "status": "nonstandard"
-  },
-  "::-ms-ticks-before": {
-    "syntax": "::-ms-ticks-before",
-    "groups": [
-      "Pseudo-elements",
-      "Selectors",
-      "Microsoft Extensions"
-    ],
-    "status": "nonstandard"
-  },
-  "::-ms-tooltip": {
-    "syntax": "::-ms-tooltip",
-    "groups": [
-      "Pseudo-elements",
-      "Selectors",
-      "Microsoft Extensions"
-    ],
-    "status": "nonstandard"
-  },
-  "::-ms-track": {
-    "syntax": "::-ms-track",
-    "groups": [
-      "Pseudo-elements",
-      "Selectors",
-      "Microsoft Extensions"
-    ],
-    "status": "nonstandard"
-  },
-  "::-ms-value": {
-    "syntax": "::-ms-value",
-    "groups": [
-      "Pseudo-elements",
-      "Selectors",
-      "Microsoft Extensions"
-    ],
-    "status": "nonstandard"
-  },
   "::-moz-progress-bar": {
     "syntax": "::-moz-progress-bar",
     "groups": [