Enhanced <select>: <selectedcontent> implementation

annevk · annevk · commit e529b93f77fc · 2025-11-05T14:30:13.000+01:00
https://bugs.webkit.org/show_bug.cgi?id=301929 rdar://164005712 Reviewed by NOBODY (OOPS!). This is a draft as there are a number of issues with the specification (and tests) and I'm not confident about the tree mutations. Tests changes: - web-platform-tests/wpt#55849
diff --git a/LayoutTests/html5lib/generated/run-tests1-data.html b/LayoutTests/html5lib/generated/run-tests1-data.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false ] -->
+<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false HTMLEnhancedSelectSelectedContentEnabled=false ] -->
 <script>
 var test_files = [ '../resources/tests1.dat' ]
 </script>
diff --git a/LayoutTests/html5lib/generated/run-tests1-write.html b/LayoutTests/html5lib/generated/run-tests1-write.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false ] -->
+<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false HTMLEnhancedSelectSelectedContentEnabled=false ] -->
 <script>
 var test_files = [ '../resources/tests1.dat' ]
 </script>
diff --git a/LayoutTests/html5lib/generated/run-tests10-data.html b/LayoutTests/html5lib/generated/run-tests10-data.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false ] -->
+<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false HTMLEnhancedSelectSelectedContentEnabled=false ] -->
 <script>
 var test_files = [ '../resources/tests10.dat' ]
 </script>
diff --git a/LayoutTests/html5lib/generated/run-tests10-write.html b/LayoutTests/html5lib/generated/run-tests10-write.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false ] -->
+<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false HTMLEnhancedSelectSelectedContentEnabled=false ] -->
 <script>
 var test_files = [ '../resources/tests10.dat' ]
 </script>
diff --git a/LayoutTests/html5lib/generated/run-tests7-data.html b/LayoutTests/html5lib/generated/run-tests7-data.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false ] -->
+<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false HTMLEnhancedSelectSelectedContentEnabled=false ] -->
 <script>
 var test_files = [ '../resources/tests7.dat' ]
 </script>
diff --git a/LayoutTests/html5lib/generated/run-tests7-write.html b/LayoutTests/html5lib/generated/run-tests7-write.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false ] -->
+<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false HTMLEnhancedSelectSelectedContentEnabled=false ] -->
 <script>
 var test_files = [ '../resources/tests7.dat' ]
 </script>
diff --git a/LayoutTests/html5lib/generated/run-tests9-data.html b/LayoutTests/html5lib/generated/run-tests9-data.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false ] -->
+<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false HTMLEnhancedSelectSelectedContentEnabled=false ] -->
 <script>
 var test_files = [ '../resources/tests9.dat' ]
 </script>
diff --git a/LayoutTests/html5lib/generated/run-tests9-write.html b/LayoutTests/html5lib/generated/run-tests9-write.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false ] -->
+<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false HTMLEnhancedSelectSelectedContentEnabled=false ] -->
 <script>
 var test_files = [ '../resources/tests9.dat' ]
 </script>
diff --git a/LayoutTests/html5lib/generated/run-tests_innerHTML_1-data.html b/LayoutTests/html5lib/generated/run-tests_innerHTML_1-data.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false ] -->
+<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false HTMLEnhancedSelectSelectedContentEnabled=false ] -->
 <script>
 var test_files = [ '../resources/tests_innerHTML_1.dat' ]
 </script>
diff --git a/LayoutTests/html5lib/generated/run-tests_innerHTML_1-write.html b/LayoutTests/html5lib/generated/run-tests_innerHTML_1-write.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false ] -->
+<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false HTMLEnhancedSelectSelectedContentEnabled=false ] -->
 <script>
 var test_files = [ '../resources/tests_innerHTML_1.dat' ]
 </script>
diff --git a/LayoutTests/html5lib/generated/run-webkit02-data.html b/LayoutTests/html5lib/generated/run-webkit02-data.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false ] -->
+<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false HTMLEnhancedSelectSelectedContentEnabled=false ] -->
 <script>
 var test_files = [ '../resources/webkit02.dat' ]
 </script>
diff --git a/LayoutTests/html5lib/generated/run-webkit02-write.html b/LayoutTests/html5lib/generated/run-webkit02-write.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false ] -->
+<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false HTMLEnhancedSelectSelectedContentEnabled=false ] -->
 <script>
 var test_files = [ '../resources/webkit02.dat' ]
 </script>
diff --git a/LayoutTests/imported/w3c/web-platform-tests/html/semantics/forms/the-select-element/customizable-select/select-value-selectedOption-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/html/semantics/forms/the-select-element/customizable-select/select-value-selectedOption-expected.txt
@@ -6,8 +6,8 @@ PASS Test value and selectedOption when value is null
 PASS Test value and selectedOption when value is undefined
 PASS Test value with non-HTMLOptionElement elements labeled as parts
 PASS Test that value and selectedOption are updated when options are removed
-FAIL Test that slotted-in selected-value part is updated to value of select assert_equals: Custom selected value part should be set to initial value of select expected "one" but got "Default custom selected-value text"
-FAIL Test that option parts in a slotted-in listbox are reflected in the value property assert_equals: Custom selected value part should be set to initial value of select expected "one" but got "Default custom selected-value text"
+PASS Test that slotted-in selected-value part is updated to value of select
+PASS Test that option parts in a slotted-in listbox are reflected in the value property
 PASS Test that value and selectedOption are correctly updated
 PASS Test that HTMLOption.selected updates select.value and select.selectedOptions
 PASS Test that HTMLOption.value updates select.value
diff --git a/LayoutTests/imported/w3c/web-platform-tests/html/semantics/forms/the-select-element/customizable-select/selectedcontent-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/html/semantics/forms/the-select-element/customizable-select/selectedcontent-expected.txt
@@ -1,7 +1,7 @@
 
 
 
-FAIL The <selectedcontent> element should reflect the HTML contents of the selected <option>. assert_equals: The innerHTML of <selectedcontent> should initially match the innerHTML of the selected <option>. expected "\n      <span class=\"one\">span</span> one\n    " but got ""
-FAIL When there are multiple <selectedcontent> elements, only the one in tree order should be kept up to date. assert_equals: selectedcontent should initially be one. expected "one" but got ""
-FAIL <seletedcontent> behavior in disconnected <select>. assert_equals: <selectedcontent> should be updated when <select> is connected to the document. expected "two" but got ""
+FAIL The <selectedcontent> element should reflect the HTML contents of the selected <option>. assert_equals: The innerHTML of <selectedcontent> should be updated in response to a form reset. expected "\n      <span class=\"one\">span</span> one\n    " but got "\n      <span class=\"two\" data-foo=\"bar\">new span</span> two\n    "
+PASS When there are multiple <selectedcontent> elements, only the one in tree order should be kept up to date.
+FAIL <seletedcontent> behavior in disconnected <select>. assert_equals: <selectedcontent> should not be updated when changing value of a disconnected select. expected "" but got "two"
 
diff --git a/LayoutTests/imported/w3c/web-platform-tests/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations-expected.txt
@@ -1,4 +1,4 @@
 
 
-FAIL MutationObserver records during parsing of <select> with <selectedcontent> assert_array_equals: lengths differ, expected array […, "Type: childList | Target: button | Added: [#text: \"\"] | After: selectedcontent", "Type: childList | Target: select | Added: [#text: \"\"] | After: button", "Type: childList | Target: select | Added: [option] | After: #text: \"\"", "Type: childList | Target: option | Added: [span]", "Type: childList | Target: span | Added: [#text: \"span\"]", "Type: childList | Target: option | Added: [#text: \"one\"] | After: span", "Type: childList | Target: selectedcontent | Added: [span, #text: \"one\"]", "Type: childList | Target: select | Added: [#text: \"\"] | After: option", "Type: childList | Target: select | Added: [option] | After: #text: \"\"", "Type: childList | Target: option | Added: [span]", "Type: childList | Target: span | Added: [#text: \"span\"]", "Type: childList | Target: option | Added: [#text: \"two\"] | After: span", "Type: childList | Target: select | Added: [#text: \"\"] | After: option", "Type: childList | Target: select | Added: [option] | After: #text: \"\"", "Type: childList | Target: selectedcontent | Removed: [span, #text: \"one\"]", "Type: childList | Target: option | Added: [span]", "Type: childList | Target: span | Added: [#text: \"span\"]", "Type: childList | Target: selectedcontent | Added: [span]", "Type: childList | Target: select | Added: [#text: \"three\"] | After: option", "Type: childList | Target: div#target | Added: [#text: \"\"] | After: select"] length 26, got […, "Type: childList | Target: select | Added: [button] | After: #text: \"\"", "Type: childList | Target: button | Added: [#text: \"\"]", "Type: childList | Target: button | Added: [selectedcontent] | After: #text: \"\"", "Type: childList | Target: button | Added: [#text: \"\"] | After: selectedcontent", "Type: childList | Target: select | Added: [#text: \"\"] | After: button", "Type: childList | Target: select | Added: [option] | After: #text: \"\"", "Type: childList | Target: option | Added: [span]", "Type: childList | Target: span | Added: [#text: \"span\"]", "Type: childList | Target: option | Added: [#text: \"one\"] | After: span", "Type: childList | Target: select | Added: [#text: \"\"] | After: option", "Type: childList | Target: select | Added: [option] | After: #text: \"\"", "Type: childList | Target: option | Added: [span]", "Type: childList | Target: span | Added: [#text: \"span\"]", "Type: childList | Target: option | Added: [#text: \"two\"] | After: span", "Type: childList | Target: select | Added: [#text: \"\"] | After: option", "Type: childList | Target: select | Added: [option] | After: #text: \"\"", "Type: childList | Target: option | Added: [span]", "Type: childList | Target: span | Added: [#text: \"span\"]", "Type: childList | Target: select | Added: [#text: \"three\"] | After: option", "Type: childList | Target: div#target | Added: [#text: \"\"] | After: select"] length 23
+PASS MutationObserver records during parsing of <select> with <selectedcontent>
 
diff --git a/LayoutTests/imported/w3c/web-platform-tests/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html b/LayoutTests/imported/w3c/web-platform-tests/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html
@@ -136,10 +136,9 @@
     "Type: childList | Target: option | Added: [#text: \"two\"] | After: span",
     "Type: childList | Target: select | Added: [#text: \"\"] | After: option",
     "Type: childList | Target: select | Added: [option] | After: #text: \"\"",
-    "Type: childList | Target: selectedcontent | Removed: [span, #text: \"one\"]",
     "Type: childList | Target: option | Added: [span]",
     "Type: childList | Target: span | Added: [#text: \"span\"]",
-    "Type: childList | Target: selectedcontent | Added: [span]",
+    "Type: childList | Target: selectedcontent | Added: [span] | Removed: [span, #text: \"one\"]",
     "Type: childList | Target: select | Added: [#text: \"three\"] | After: option",
     "Type: childList | Target: div#target | Added: [#text: \"\"] | After: select"
   ];
diff --git a/LayoutTests/imported/w3c/web-platform-tests/html/syntax/parsing/html5lib_webkit02_run_type=uri-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/html/syntax/parsing/html5lib_webkit02_run_type=uri-expected.txt
@@ -40,80 +40,6 @@ PASS html5lib_webkit02.html a6c50b1f6bfbe3c55102d8cad0950d0b68cc6729
 PASS html5lib_webkit02.html 411f313a1b92ac7be549c41ee6758f952dc2dced
 PASS html5lib_webkit02.html 84467597648753feeb78793e2cc9196bc75857c2
 PASS html5lib_webkit02.html ae6f2e0a014f620269920ceb12660ec708236846
-FAIL html5lib_webkit02.html fd7aea4db6702879b9f8f410b0400d9300ae9c05 assert_equals: expected "#document\n| <html>\n|   <head>\n|   <body>\n|     <select>\n|       <button>\n|         <selectedcontent>\n|           \"X\"\n|       <option>\n|         \"X\"" but got "#document\n| <html>\n|   <head>\n|   <body>\n|     <select>\n|       <button>\n|         <selectedcontent>\n|       <option>\n|         \"X\""
-FAIL html5lib_webkit02.html bad5cceffaffe98e3a1522be5f7df3e3e179d500 assert_equals: expected "#document\n| <html>\n|   <head>\n|   <body>\n|     <select>\n|       <button>\n|         <selectedcontent>\n|           \"x\"\n|           <i>\n|             \"i\"\n|             <b>\n|               \"ib\"\n|           <b>\n|             \"b\"\n|       <option>\n|         \"x\"\n|         <i>\n|           \"i\"\n|           <b>\n|             \"ib\"\n|         <b>\n|           \"b\"" but got "#document\n| <html>\n|   <head>\n|   <body>\n|     <select>\n|       <button>\n|         <selectedcontent>\n|       <option>\n|         \"x\"\n|         <i>\n|           \"i\"\n|           <b>\n|             \"ib\"\n|         <b>\n|           \"b\""
-fd7aea4db6702879b9f8f410b0400d9300ae9c05
-
-Input
-
-<select><button><selectedcontent></button><option>X
-Expected
-
-#document
-| <html>
-|   <head>
-|   <body>
-|     <select>
-|       <button>
-|         <selectedcontent>
-|           "X"
-|       <option>
-|         "X"
-Actual
-
-#document
-| <html>
-|   <head>
-|   <body>
-|     <select>
-|       <button>
-|         <selectedcontent>
-|       <option>
-|         "X"
-bad5cceffaffe98e3a1522be5f7df3e3e179d500
-
-Input
-
-<select><button><selectedcontent></button><option>x<i>i<b>ib</i>b
-Expected
-
-#document
-| <html>
-|   <head>
-|   <body>
-|     <select>
-|       <button>
-|         <selectedcontent>
-|           "x"
-|           <i>
-|             "i"
-|             <b>
-|               "ib"
-|           <b>
-|             "b"
-|       <option>
-|         "x"
-|         <i>
-|           "i"
-|           <b>
-|             "ib"
-|         <b>
-|           "b"
-Actual
-
-#document
-| <html>
-|   <head>
-|   <body>
-|     <select>
-|       <button>
-|         <selectedcontent>
-|       <option>
-|         "x"
-|         <i>
-|           "i"
-|           <b>
-|             "ib"
-|         <b>
-|           "b"
+PASS html5lib_webkit02.html fd7aea4db6702879b9f8f410b0400d9300ae9c05
+PASS html5lib_webkit02.html bad5cceffaffe98e3a1522be5f7df3e3e179d500
 
diff --git a/LayoutTests/imported/w3c/web-platform-tests/html/syntax/parsing/html5lib_webkit02_run_type=write-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/html/syntax/parsing/html5lib_webkit02_run_type=write-expected.txt
@@ -40,80 +40,6 @@ PASS html5lib_webkit02.html a6c50b1f6bfbe3c55102d8cad0950d0b68cc6729
 PASS html5lib_webkit02.html 411f313a1b92ac7be549c41ee6758f952dc2dced
 PASS html5lib_webkit02.html 84467597648753feeb78793e2cc9196bc75857c2
 PASS html5lib_webkit02.html ae6f2e0a014f620269920ceb12660ec708236846
-FAIL html5lib_webkit02.html fd7aea4db6702879b9f8f410b0400d9300ae9c05 assert_equals: expected "#document\n| <html>\n|   <head>\n|   <body>\n|     <select>\n|       <button>\n|         <selectedcontent>\n|           \"X\"\n|       <option>\n|         \"X\"" but got "#document\n| <html>\n|   <head>\n|   <body>\n|     <select>\n|       <button>\n|         <selectedcontent>\n|       <option>\n|         \"X\""
-FAIL html5lib_webkit02.html bad5cceffaffe98e3a1522be5f7df3e3e179d500 assert_equals: expected "#document\n| <html>\n|   <head>\n|   <body>\n|     <select>\n|       <button>\n|         <selectedcontent>\n|           \"x\"\n|           <i>\n|             \"i\"\n|             <b>\n|               \"ib\"\n|           <b>\n|             \"b\"\n|       <option>\n|         \"x\"\n|         <i>\n|           \"i\"\n|           <b>\n|             \"ib\"\n|         <b>\n|           \"b\"" but got "#document\n| <html>\n|   <head>\n|   <body>\n|     <select>\n|       <button>\n|         <selectedcontent>\n|       <option>\n|         \"x\"\n|         <i>\n|           \"i\"\n|           <b>\n|             \"ib\"\n|         <b>\n|           \"b\""
-fd7aea4db6702879b9f8f410b0400d9300ae9c05
-
-Input
-
-<select><button><selectedcontent></button><option>X
-Expected
-
-#document
-| <html>
-|   <head>
-|   <body>
-|     <select>
-|       <button>
-|         <selectedcontent>
-|           "X"
-|       <option>
-|         "X"
-Actual
-
-#document
-| <html>
-|   <head>
-|   <body>
-|     <select>
-|       <button>
-|         <selectedcontent>
-|       <option>
-|         "X"
-bad5cceffaffe98e3a1522be5f7df3e3e179d500
-
-Input
-
-<select><button><selectedcontent></button><option>x<i>i<b>ib</i>b
-Expected
-
-#document
-| <html>
-|   <head>
-|   <body>
-|     <select>
-|       <button>
-|         <selectedcontent>
-|           "x"
-|           <i>
-|             "i"
-|             <b>
-|               "ib"
-|           <b>
-|             "b"
-|       <option>
-|         "x"
-|         <i>
-|           "i"
-|           <b>
-|             "ib"
-|         <b>
-|           "b"
-Actual
-
-#document
-| <html>
-|   <head>
-|   <body>
-|     <select>
-|       <button>
-|         <selectedcontent>
-|       <option>
-|         "x"
-|         <i>
-|           "i"
-|           <b>
-|             "ib"
-|         <b>
-|           "b"
+PASS html5lib_webkit02.html fd7aea4db6702879b9f8f410b0400d9300ae9c05
+PASS html5lib_webkit02.html bad5cceffaffe98e3a1522be5f7df3e3e179d500
 
diff --git a/LayoutTests/imported/w3c/web-platform-tests/html/syntax/parsing/html5lib_webkit02_run_type=write_single-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/html/syntax/parsing/html5lib_webkit02_run_type=write_single-expected.txt
@@ -40,80 +40,6 @@ PASS html5lib_webkit02.html a6c50b1f6bfbe3c55102d8cad0950d0b68cc6729
 PASS html5lib_webkit02.html 411f313a1b92ac7be549c41ee6758f952dc2dced
 PASS html5lib_webkit02.html 84467597648753feeb78793e2cc9196bc75857c2
 PASS html5lib_webkit02.html ae6f2e0a014f620269920ceb12660ec708236846
-FAIL html5lib_webkit02.html fd7aea4db6702879b9f8f410b0400d9300ae9c05 assert_equals: expected "#document\n| <html>\n|   <head>\n|   <body>\n|     <select>\n|       <button>\n|         <selectedcontent>\n|           \"X\"\n|       <option>\n|         \"X\"" but got "#document\n| <html>\n|   <head>\n|   <body>\n|     <select>\n|       <button>\n|         <selectedcontent>\n|       <option>\n|         \"X\""
-FAIL html5lib_webkit02.html bad5cceffaffe98e3a1522be5f7df3e3e179d500 assert_equals: expected "#document\n| <html>\n|   <head>\n|   <body>\n|     <select>\n|       <button>\n|         <selectedcontent>\n|           \"x\"\n|           <i>\n|             \"i\"\n|             <b>\n|               \"ib\"\n|           <b>\n|             \"b\"\n|       <option>\n|         \"x\"\n|         <i>\n|           \"i\"\n|           <b>\n|             \"ib\"\n|         <b>\n|           \"b\"" but got "#document\n| <html>\n|   <head>\n|   <body>\n|     <select>\n|       <button>\n|         <selectedcontent>\n|       <option>\n|         \"x\"\n|         <i>\n|           \"i\"\n|           <b>\n|             \"ib\"\n|         <b>\n|           \"b\""
-fd7aea4db6702879b9f8f410b0400d9300ae9c05
-
-Input
-
-<select><button><selectedcontent></button><option>X
-Expected
-
-#document
-| <html>
-|   <head>
-|   <body>
-|     <select>
-|       <button>
-|         <selectedcontent>
-|           "X"
-|       <option>
-|         "X"
-Actual
-
-#document
-| <html>
-|   <head>
-|   <body>
-|     <select>
-|       <button>
-|         <selectedcontent>
-|       <option>
-|         "X"
-bad5cceffaffe98e3a1522be5f7df3e3e179d500
-
-Input
-
-<select><button><selectedcontent></button><option>x<i>i<b>ib</i>b
-Expected
-
-#document
-| <html>
-|   <head>
-|   <body>
-|     <select>
-|       <button>
-|         <selectedcontent>
-|           "x"
-|           <i>
-|             "i"
-|             <b>
-|               "ib"
-|           <b>
-|             "b"
-|       <option>
-|         "x"
-|         <i>
-|           "i"
-|           <b>
-|             "ib"
-|         <b>
-|           "b"
-Actual
-
-#document
-| <html>
-|   <head>
-|   <body>
-|     <select>
-|       <button>
-|         <selectedcontent>
-|       <option>
-|         "x"
-|         <i>
-|           "i"
-|           <b>
-|             "ib"
-|         <b>
-|           "b"
+PASS html5lib_webkit02.html fd7aea4db6702879b9f8f410b0400d9300ae9c05
+PASS html5lib_webkit02.html bad5cceffaffe98e3a1522be5f7df3e3e179d500
 
diff --git a/Source/WTF/Scripts/Preferences/UnifiedWebPreferences.yaml b/Source/WTF/Scripts/Preferences/UnifiedWebPreferences.yaml
@@ -3431,7 +3431,7 @@ HTMLEnhancedSelectParsingEnabled:
 
 HTMLEnhancedSelectSelectedContentEnabled:
    type: bool
-   status: unstable
+   status: testable
    category: dom
    humanReadableName: "Enhanced HTML select: selectedcontent element"
    humanReadableDescription: "Enable enhanced HTML select: selectedcontent element"
diff --git a/Source/WebCore/dom/ContainerNode.cpp b/Source/WebCore/dom/ContainerNode.cpp
@@ -1289,6 +1289,17 @@ ExceptionOr<void> ContainerNode::replaceChildren(FixedVector<NodeOrString>&& vec
     return { };
 }
 
+void ContainerNode::replaceChildrenWithoutValidityCheck(NodeVector&& newChildren)
+{
+    ChildListMutationScope mutation(*this);
+    NodeVector removedChildren;
+    removeAllChildrenWithScriptAssertionMaybeAsync(ChildChange::Source::API, removedChildren, DeferChildrenChanged::No);
+    auto appendResult = insertChildrenBeforeWithoutPreInsertionValidityCheck(WTFMove(newChildren));
+    ASSERT_UNUSED(appendResult, !appendResult.hasException());
+    rebuildSVGExtensionsElementsIfNecessary();
+    dispatchSubtreeModifiedEvent();
+}
+
 HTMLCollection* ContainerNode::cachedHTMLCollection(CollectionType type)
 {
     return hasRareData() && rareData()->nodeLists() ? rareData()->nodeLists()->cachedCollection<HTMLCollection>(type) : nullptr;
diff --git a/Source/WebCore/dom/ContainerNode.h b/Source/WebCore/dom/ContainerNode.h
@@ -145,6 +145,7 @@ class ContainerNode : public Node {
     ExceptionOr<void> prepend(FixedVector<NodeOrString>&&);
 
     ExceptionOr<void> replaceChildren(FixedVector<NodeOrString>&&);
+    void replaceChildrenWithoutValidityCheck(NodeVector&&);
 
     ExceptionOr<void> ensurePreInsertionValidity(Node& newChild, Node* refChild);
     ExceptionOr<void> ensurePreInsertionValidityForPhantomDocumentFragment(NodeVector& newChildren, Node* refChild = nullptr);
diff --git a/Source/WebCore/html/HTMLOptionElement.cpp b/Source/WebCore/html/HTMLOptionElement.cpp
diff --git a/Source/WebCore/html/HTMLOptionElement.h b/Source/WebCore/html/HTMLOptionElement.h
diff --git a/Source/WebCore/html/HTMLSelectElement.cpp b/Source/WebCore/html/HTMLSelectElement.cpp
diff --git a/Source/WebCore/html/HTMLSelectElement.h b/Source/WebCore/html/HTMLSelectElement.h
diff --git a/Source/WebCore/html/HTMLSelectedContentElement.cpp b/Source/WebCore/html/HTMLSelectedContentElement.cpp
diff --git a/Source/WebCore/html/HTMLSelectedContentElement.h b/Source/WebCore/html/HTMLSelectedContentElement.h

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false ] -->`
	`1`	`+<!DOCTYPE html><!-- webkit-test-runner [ HTMLEnhancedSelectParsingEnabled=false HTMLEnhancedSelectSelectedContentEnabled=false ] -->`
`2`	`2`	`<script>`
`3`	`3`	`var test_files = [ '../resources/tests1.dat' ]`
`4`	`4`	`</script>`