diff --git a/lib/capybara/spec/test_app.rb b/lib/capybara/spec/test_app.rb
index b29a1523c..3b9a50a94 100644
--- a/lib/capybara/spec/test_app.rb
+++ b/lib/capybara/spec/test_app.rb
@@ -31,6 +31,10 @@ def initialize(string1, msg)
     'Another World'
   end
 
+  get '/slow_resources' do
+    '<img src="https://httpstat.us/504?sleep=100000" />'
+  end
+
   get '/redirect' do
     redirect '/redirect_again'
   end
diff --git a/spec/selenium_spec_chrome.rb b/spec/selenium_spec_chrome.rb
index cde0d65dd..c42cd96c1 100644
--- a/spec/selenium_spec_chrome.rb
+++ b/spec/selenium_spec_chrome.rb
@@ -149,6 +149,12 @@ module TestSessions
     it 'sets the http client read timeout' do
       expect(TestSessions::Chrome.driver.browser.send(:bridge).http.read_timeout).to eq 30
     end
+
+    it 'does NOT block on slow resources' do
+      expect {
+        TestSessions::Chrome.visit('/slow_resources')
+      }.to raise_error(Net::ReadTimeout)
+    end
   end
 
   describe 'filling in Chrome-specific date and time fields with keystrokes' do
diff --git a/spec/selenium_spec_firefox.rb b/spec/selenium_spec_firefox.rb
index 4881b510e..784294556 100644
--- a/spec/selenium_spec_firefox.rb
+++ b/spec/selenium_spec_firefox.rb
@@ -206,6 +206,12 @@ module TestSessions
     it 'sets the http client read timeout' do
       expect(TestSessions::SeleniumFirefox.driver.browser.send(:bridge).http.read_timeout).to eq 31
     end
+
+    it 'does NOT block on slow resources' do
+      expect {
+        TestSessions::SeleniumFirefox.visit('/slow_resources')
+      }.to raise_error(Net::ReadTimeout)
+    end
   end
 end
 
diff --git a/spec/selenium_spec_safari.rb b/spec/selenium_spec_safari.rb
index ed83861f6..5808c5e6b 100644
--- a/spec/selenium_spec_safari.rb
+++ b/spec/selenium_spec_safari.rb
@@ -128,6 +128,12 @@ module TestSessions
     it 'sets the http client read timeout' do
       expect(TestSessions::Safari.driver.browser.send(:bridge).http.read_timeout).to eq 30
     end
+
+    it 'does NOT block on slow resources' do
+      expect {
+        TestSessions::Safari.visit('/slow_resources')
+      }.to raise_error(Net::ReadTimeout)
+    end
   end
 
   describe 'filling in Safari-specific date and time fields with keystrokes' do