Prototype declarative shadow DOM #4693

rniwa · 2022-09-26T03:03:56Z

`46837e5`

Prototype declarative shadow DOM
https://bugs.webkit.org/show_bug.cgi?id=245556

Reviewed by Chris Dumez.

Implement the declarative shadow DOM an experimental feature.

See whatwg/html#5465 and whatwg/dom#892

There are a few differences between what's being proposed and what we implement:
1. getInnerHTML method is not added; we've given quite a few feedback on this method, and it's nowhere near ready for implementation.
2. Declarative shadow DOMs inside another template element doesn't automatically get converted to a shadow tree,
and there is no special treatment of declarative shadow DOM when cloning Nodes.

* LayoutTests/imported/w3c/web-platform-tests/html/semantics/popups/popup-light-dismiss.tentative-expected.txt: Rebaselined.
* LayoutTests/imported/w3c/web-platform-tests/shadow-dom/declarative/declarative-shadow-dom-attachment.tentative-expected.txt:
Rebaselined the test now that we pass more test cases.
* LayoutTests/imported/w3c/web-platform-tests/shadow-dom/declarative/declarative-shadow-dom-basic.tentative-expected.txt: Ditto.
* LayoutTests/imported/w3c/web-platform-tests/shadow-dom/declarative/declarative-shadow-dom-opt-in.tentative-expected.txt: Ditto.
* LayoutTests/imported/w3c/web-platform-tests/shadow-dom/declarative/innerhtml-before-closing-tag.tentative-expected.txt: Ditto.
* LayoutTests/imported/w3c/web-platform-tests/shadow-dom/declarative/move-template-before-closing-tag-expected.txt: Removed.
* LayoutTests/imported/w3c/web-platform-tests/shadow-dom/declarative/move-template-before-closing-tag.tentative-expected.txt: Ditto.
* LayoutTests/imported/w3c/web-platform-tests/shadow-dom/declarative/script-access.tentative-expected.txt: Rebaselined.

* Source/WTF/Scripts/Preferences/WebPreferencesExperimental.yaml: Added a runtime flag.

* Source/WebCore/CMakeLists.txt:
* Source/WebCore/DerivedSources-input.xcfilelist:
* Source/WebCore/DerivedSources-output.xcfilelist:
* Source/WebCore/DerivedSources.make:
* Source/WebCore/Sources.txt:
* Source/WebCore/WebCore.xcodeproj/project.pbxproj:

* Source/WebCore/dom/DOMImplementation.cpp:
(WebCore::createXMLDocument): Disable declarative shadow DOM in a document created by DOMImplementation.createDocument.
(WebCore::DOMImplementation::createDocument): Ditto.
(WebCore::DOMImplementation::createHTMLDocument): Ditto.

* Source/WebCore/dom/Document.cpp:
(WebCore::Document::Document): Initialize newly introduced m_parserContentPolicy with DefaultParserContentPolicy.
(WebCore::Document::createParser): Specify m_parserContentPolicy as an argument to XMLDocumentParser::create.

* Source/WebCore/dom/Document.h:
(WebCore::Document::parserContentPolicy const): Added.
(WebCore::Document::setParserContentPolicy): Added.

* Source/WebCore/dom/Element.cpp:
(WebCore::Element::attachShadow): Returns the shadow root of declarative shadow DOM if one is available. This happens exactly once
since this function then clears the flag from ShadowRoot.
(WebCore::Element::attachDeclarativeShadow): Added.

* Source/WebCore/dom/Element.h:
* Source/WebCore/dom/FragmentScriptingPermission.h:
(WebCore::ParserContentPolicy): Added AllowDeclarativeShadowDOM.

* Source/WebCore/dom/ScriptableDocumentParser.h:
(WebCore::ScriptableDocumentParser::parserContentPolicy const): Made this const.
(WebCore::ScriptableDocumentParser::setParserContentPolicy): Added.
(WebCore::ScriptableDocumentParser::ScriptableDocumentParser): Added

* Source/WebCore/dom/ShadowRoot.h:
(WebCore::ShadowRoot::isDeclarativeShadowRoot): Added.
(WebCore::ShadowRoot::setIsDeclarativeShadowRoot): Added.

* Source/WebCore/html/HTMLAttributeNames.in:

* Source/WebCore/html/HTMLDocument.cpp:
(WebCore::HTMLDocument::createParser): Pass in the parser content policy.

* Source/WebCore/html/HTMLTemplateElement.cpp:
(WebCore::HTMLTemplateElement::attachAsDeclarativeShadowRootIfNeeded): Added. Implements the main logic of declarative shadow DOM.

* Source/WebCore/html/HTMLTemplateElement.h:
* Source/WebCore/html/parser/HTMLConstructionSite.cpp:
(WebCore::HTMLConstructionSite::attachDeclarativeShadowRootIfNeeded): Added.

* Source/WebCore/html/parser/HTMLConstructionSite.h:

* Source/WebCore/html/parser/HTMLDocumentParser.cpp:
(WebCore::HTMLDocumentParser::HTMLDocumentParser): Takes OptionSet<ParserContentPolicy> as an argument.
(WebCore::HTMLDocumentParser::create): Ditto.

* Source/WebCore/html/parser/HTMLDocumentParser.h:

* Source/WebCore/html/parser/HTMLTreeBuilder.cpp:
(WebCore::HTMLTreeBuilder::processTemplateEndTag): Attach the template content as the declarative shadow DOM if applicable.

* Source/WebCore/xml/DOMParser.cpp:
(WebCore::DOMParser::parseFromString): Added ParseFromStringOptions as an argument.

* Source/WebCore/xml/DOMParser.h:
* Source/WebCore/xml/DOMParser.idl:

* Source/WebCore/xml/ParseFromStringOptions.h: Added.
* Source/WebCore/xml/ParseFromStringOptions.idl: Added.

* Source/WebCore/xml/XMLHttpRequest.cpp:
(XMLHttpRequest::responseXML): Disable declarative shadow DOM in the response document.

* Source/WebCore/xml/parser/XMLDocumentParser.h:
(WebCore::XMLDocumentParser::create): Takes OptionSet<ParserContentPolicy> as an argument.

* Source/WebCore/xml/parser/XMLDocumentParserLibxml2.cpp:
(WebCore::XMLDocumentParser::XMLDocumentParser): Ditto.

Canonical link: https://commits.webkit.org/254964@main

2561ad4

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	~~🛠 🧪 win~~
✅ 🧪 bindings	✅ 🛠 ios-sim	~~🛠 mac-debug~~	✅ 🛠 gtk	✅ 🛠 wincairo
✅ 🧪 webkitperl	~~🧪 ios-wk2~~	✅ 🛠 mac-AS-debug	✅ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 api-mac	❌ 🧪 api-gtk
✅ 🛠 🧪 jsc	✅ 🛠 tv	✅ 🧪 mac-wk1	✅ 🛠 jsc-armv7
	✅ 🛠 tv-sim	✅ 🧪 mac-wk2	✅ 🧪 jsc-armv7-tests
✅ 🛠 🧪 merge	✅ 🛠 watch	~~🧪 mac-AS-debug-wk2~~	✅ 🛠 jsc-mips
	✅ 🛠 watch-sim	✅ 🧪 mac-wk2-stress	❌ 🧪 jsc-mips-tests

webkit-early-warning-system · 2022-09-26T03:04:01Z

EWS run on previous version of this PR (hash f9ce82f)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	❌ 🛠 🧪 win
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-debug	✅ 🛠 gtk	✅ 🛠 wincairo
✅ 🧪 webkitperl	❌ 🧪 ios-wk2	✅ 🛠 mac-AS-debug	❌ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 api-mac	✅ 🧪 api-gtk
✅ 🛠 🧪 jsc	✅ 🛠 tv	❌ 🧪 mac-wk1	✅ 🛠 jsc-armv7
	✅ 🛠 tv-sim	❌ 🧪 mac-wk2	✅ 🧪 jsc-armv7-tests
	✅ 🛠 watch	❌ 🧪 mac-AS-debug-wk2	✅ 🛠 jsc-mips
	✅ 🛠 watch-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 jsc-mips-tests

webkit-early-warning-system · 2022-09-27T03:06:46Z

Starting EWS tests for 0946f19. Live statuses available at the PR page, #4693

webkit-early-warning-system · 2022-09-27T03:06:47Z

EWS run on previous version of this PR (hash 0946f19)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	❌ 🛠 🧪 win
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-debug	✅ 🛠 gtk	✅ 🛠 wincairo
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🛠 mac-AS-debug	✅ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 api-mac	❌ 🧪 api-gtk
✅ 🛠 🧪 jsc	✅ 🛠 tv	✅ 🧪 mac-wk1	✅ 🛠 jsc-armv7
	✅ 🛠 tv-sim	✅ 🧪 mac-wk2	✅ 🧪 jsc-armv7-tests
	✅ 🛠 watch	✅ 🧪 mac-AS-debug-wk2	✅ 🛠 jsc-mips
	✅ 🛠 watch-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 jsc-mips-tests

cdumez

LGTM with minor nits.

cdumez · 2022-09-27T16:08:48Z

Source/WebCore/dom/Element.h

@@ -334,6 +334,7 @@ class Element : public ContainerNode {
    ShadowRoot* shadowRootForBindings(JSC::JSGlobalObject&) const;

    WEBCORE_EXPORT ExceptionOr<ShadowRoot&> attachShadow(const ShadowRootInit&);
+    ExceptionOr<ShadowRoot&>  attachDeclarativeShadow(ShadowRootMode, bool delegatesFocus);


nit: looks like an extra space before "attach".

Oh oops, will fix.

cdumez · 2022-09-27T16:13:12Z

Source/WebCore/html/HTMLTemplateElement.cpp

+    auto importedContent = document().importNode(content(), /* deep */ true).releaseReturnValue();
+    for (RefPtr<Node> node = NodeTraversal::next(importedContent), next; node; node = next) {
+        next = NodeTraversal::next(*node);
+        if (!is<HTMLTemplateElement>(node))


if (!is<HTMLTemplateElement>(*node)) would avoid an unnecessary null check.

Good pint. Will do.

cdumez · 2022-09-27T16:14:07Z

Source/WebCore/html/HTMLTemplateElement.cpp

+        next = NodeTraversal::next(*node);
+        if (!is<HTMLTemplateElement>(node))
+            continue;
+        RefPtr parentElement = node->parentElement();


Your call but this is less lines:

if (RefPtr parentElement = node->parentElement()) downcast<HTMLTemplateElement>(*node).attachAsDeclarativeShadowRootIfNeeded(*parentElement);

Okay, let's go with that.

cdumez · 2022-09-27T16:17:23Z

Source/WebCore/html/parser/HTMLTreeBuilder.cpp

@@ -900,10 +901,21 @@ bool HTMLTreeBuilder::processTemplateEndTag(AtomHTMLToken&& token)
    m_tree.generateImpliedEndTags();
    if (m_tree.currentStackItem().elementName() != HTML::template_)
        parseError(token);
-    m_tree.openElements().popUntilPopped(HTML::template_);
+    m_tree.openElements().popUntil(HTML::template_);
+    RefPtr templateElement = dynamicDowncast<HTMLTemplateElement>(m_tree.openElements().top());


So this code does a release type check here and then a release null check on the next line. I think the following would be slightly more efficient:

RELEASE_ASSERT(is<HTMLTemplateElement>(m_tree.openElements().top()); // Release type check. Ref templateElement = downcast<HTMLTemplateElement>(*m_tree.openElements().top()); // no release check.

Sure. Will do

webkit-early-warning-system · 2022-09-28T02:43:43Z

Starting EWS tests for 00021eb. Live statuses available at the PR page, #4693

webkit-early-warning-system · 2022-09-28T02:43:43Z

EWS run on previous version of this PR (hash 00021eb)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	⏳ 🛠 mac	⏳ 🛠 wpe	⏳ 🛠 🧪 win
✅ 🧪 bindings	✅ 🛠 ios-sim	⏳ 🛠 mac-debug	✅ 🛠 gtk	⏳ 🛠 wincairo
✅ 🧪 webkitperl	~~🧪 ios-wk2~~	⏳ 🛠 mac-AS-debug	~~🧪 gtk-wk2~~
	~~🧪 api-ios~~	⏳ 🧪 api-mac	~~🧪 api-gtk~~
✅ 🛠 🧪 jsc	✅ 🛠 tv	⏳ 🧪 mac-wk1	✅ 🛠 jsc-armv7
	✅ 🛠 tv-sim	⏳ 🧪 mac-wk2	✅ 🧪 jsc-armv7-tests
	✅ 🛠 watch	⏳ 🧪 mac-AS-debug-wk2	✅ 🛠 jsc-mips
	✅ 🛠 watch-sim	⏳ 🧪 mac-wk2-stress	✅ 🧪 jsc-mips-tests

webkit-early-warning-system · 2022-09-28T04:23:45Z

EWS run on current version of this PR (hash 2561ad4)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	~~🛠 🧪 win~~
✅ 🧪 bindings	✅ 🛠 ios-sim	~~🛠 mac-debug~~	✅ 🛠 gtk	✅ 🛠 wincairo
✅ 🧪 webkitperl	~~🧪 ios-wk2~~	✅ 🛠 mac-AS-debug	✅ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 api-mac	❌ 🧪 api-gtk
✅ 🛠 🧪 jsc	✅ 🛠 tv	✅ 🧪 mac-wk1	✅ 🛠 jsc-armv7
	✅ 🛠 tv-sim	✅ 🧪 mac-wk2	✅ 🧪 jsc-armv7-tests
✅ 🛠 🧪 merge	✅ 🛠 watch	~~🧪 mac-AS-debug-wk2~~	✅ 🛠 jsc-mips
	✅ 🛠 watch-sim	✅ 🧪 mac-wk2-stress	❌ 🧪 jsc-mips-tests

https://bugs.webkit.org/show_bug.cgi?id=245556 Reviewed by Chris Dumez. Implement the declarative shadow DOM an experimental feature. See whatwg/html#5465 and whatwg/dom#892 There are a few differences between what's being proposed and what we implement: 1. getInnerHTML method is not added; we've given quite a few feedback on this method, and it's nowhere near ready for implementation. 2. Declarative shadow DOMs inside another template element doesn't automatically get converted to a shadow tree, and there is no special treatment of declarative shadow DOM when cloning Nodes. * LayoutTests/imported/w3c/web-platform-tests/html/semantics/popups/popup-light-dismiss.tentative-expected.txt: Rebaselined. * LayoutTests/imported/w3c/web-platform-tests/shadow-dom/declarative/declarative-shadow-dom-attachment.tentative-expected.txt: Rebaselined the test now that we pass more test cases. * LayoutTests/imported/w3c/web-platform-tests/shadow-dom/declarative/declarative-shadow-dom-basic.tentative-expected.txt: Ditto. * LayoutTests/imported/w3c/web-platform-tests/shadow-dom/declarative/declarative-shadow-dom-opt-in.tentative-expected.txt: Ditto. * LayoutTests/imported/w3c/web-platform-tests/shadow-dom/declarative/innerhtml-before-closing-tag.tentative-expected.txt: Ditto. * LayoutTests/imported/w3c/web-platform-tests/shadow-dom/declarative/move-template-before-closing-tag-expected.txt: Removed. * LayoutTests/imported/w3c/web-platform-tests/shadow-dom/declarative/move-template-before-closing-tag.tentative-expected.txt: Ditto. * LayoutTests/imported/w3c/web-platform-tests/shadow-dom/declarative/script-access.tentative-expected.txt: Rebaselined. * Source/WTF/Scripts/Preferences/WebPreferencesExperimental.yaml: Added a runtime flag. * Source/WebCore/CMakeLists.txt: * Source/WebCore/DerivedSources-input.xcfilelist: * Source/WebCore/DerivedSources-output.xcfilelist: * Source/WebCore/DerivedSources.make: * Source/WebCore/Sources.txt: * Source/WebCore/WebCore.xcodeproj/project.pbxproj: * Source/WebCore/dom/DOMImplementation.cpp: (WebCore::createXMLDocument): Disable declarative shadow DOM in a document created by DOMImplementation.createDocument. (WebCore::DOMImplementation::createDocument): Ditto. (WebCore::DOMImplementation::createHTMLDocument): Ditto. * Source/WebCore/dom/Document.cpp: (WebCore::Document::Document): Initialize newly introduced m_parserContentPolicy with DefaultParserContentPolicy. (WebCore::Document::createParser): Specify m_parserContentPolicy as an argument to XMLDocumentParser::create. * Source/WebCore/dom/Document.h: (WebCore::Document::parserContentPolicy const): Added. (WebCore::Document::setParserContentPolicy): Added. * Source/WebCore/dom/Element.cpp: (WebCore::Element::attachShadow): Returns the shadow root of declarative shadow DOM if one is available. This happens exactly once since this function then clears the flag from ShadowRoot. (WebCore::Element::attachDeclarativeShadow): Added. * Source/WebCore/dom/Element.h: * Source/WebCore/dom/FragmentScriptingPermission.h: (WebCore::ParserContentPolicy): Added AllowDeclarativeShadowDOM. * Source/WebCore/dom/ScriptableDocumentParser.h: (WebCore::ScriptableDocumentParser::parserContentPolicy const): Made this const. (WebCore::ScriptableDocumentParser::setParserContentPolicy): Added. (WebCore::ScriptableDocumentParser::ScriptableDocumentParser): Added * Source/WebCore/dom/ShadowRoot.h: (WebCore::ShadowRoot::isDeclarativeShadowRoot): Added. (WebCore::ShadowRoot::setIsDeclarativeShadowRoot): Added. * Source/WebCore/html/HTMLAttributeNames.in: * Source/WebCore/html/HTMLDocument.cpp: (WebCore::HTMLDocument::createParser): Pass in the parser content policy. * Source/WebCore/html/HTMLTemplateElement.cpp: (WebCore::HTMLTemplateElement::attachAsDeclarativeShadowRootIfNeeded): Added. Implements the main logic of declarative shadow DOM. * Source/WebCore/html/HTMLTemplateElement.h: * Source/WebCore/html/parser/HTMLConstructionSite.cpp: (WebCore::HTMLConstructionSite::attachDeclarativeShadowRootIfNeeded): Added. * Source/WebCore/html/parser/HTMLConstructionSite.h: * Source/WebCore/html/parser/HTMLDocumentParser.cpp: (WebCore::HTMLDocumentParser::HTMLDocumentParser): Takes OptionSet<ParserContentPolicy> as an argument. (WebCore::HTMLDocumentParser::create): Ditto. * Source/WebCore/html/parser/HTMLDocumentParser.h: * Source/WebCore/html/parser/HTMLTreeBuilder.cpp: (WebCore::HTMLTreeBuilder::processTemplateEndTag): Attach the template content as the declarative shadow DOM if applicable. * Source/WebCore/xml/DOMParser.cpp: (WebCore::DOMParser::parseFromString): Added ParseFromStringOptions as an argument. * Source/WebCore/xml/DOMParser.h: * Source/WebCore/xml/DOMParser.idl: * Source/WebCore/xml/ParseFromStringOptions.h: Added. * Source/WebCore/xml/ParseFromStringOptions.idl: Added. * Source/WebCore/xml/XMLHttpRequest.cpp: (XMLHttpRequest::responseXML): Disable declarative shadow DOM in the response document. * Source/WebCore/xml/parser/XMLDocumentParser.h: (WebCore::XMLDocumentParser::create): Takes OptionSet<ParserContentPolicy> as an argument. * Source/WebCore/xml/parser/XMLDocumentParserLibxml2.cpp: (WebCore::XMLDocumentParser::XMLDocumentParser): Ditto. Canonical link: https://commits.webkit.org/254964@main

webkit-commit-queue · 2022-09-28T17:45:54Z

Committed 254964@main (46837e5): https://commits.webkit.org/254964@main

Reviewed commits have been landed. Closing PR #4693 and removing active labels.

rniwa requested a review from cdumez as a code owner September 26, 2022 03:03

rniwa self-assigned this Sep 26, 2022

rniwa added DOM For bugs specific to XML/HTML DOM elements (including parsing). WebKit Nightly Build labels Sep 26, 2022

rniwa requested a review from anttijk September 26, 2022 03:04

webkit-ews-buildbot added the merging-blocked Applied to prevent a change from being merged label Sep 26, 2022

rniwa requested review from darinadler and geoffreygaren September 26, 2022 20:29

rniwa removed the merging-blocked Applied to prevent a change from being merged label Sep 27, 2022

rniwa force-pushed the fix245556 branch from f9ce82f to 0946f19 Compare September 27, 2022 03:06

cdumez approved these changes Sep 27, 2022

View reviewed changes

rniwa force-pushed the fix245556 branch from 0946f19 to 00021eb Compare September 28, 2022 02:43

rniwa force-pushed the fix245556 branch from 00021eb to 2561ad4 Compare September 28, 2022 04:23

rniwa added the merge-queue Applied to send a pull request to merge-queue label Sep 28, 2022

webkit-early-warning-system force-pushed the fix245556 branch from 2561ad4 to 46837e5 Compare September 28, 2022 17:45

webkit-early-warning-system merged commit 46837e5 into WebKit:main Sep 28, 2022

webkit-commit-queue removed the merge-queue Applied to send a pull request to merge-queue label Sep 28, 2022

rniwa deleted the fix245556 branch February 2, 2023 02:24

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Prototype declarative shadow DOM #4693

Prototype declarative shadow DOM #4693

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Prototype declarative shadow DOM #4693

Prototype declarative shadow DOM #4693

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