Handling of text documents does not comply with modern HTML spec

[brentfulgham]

e30caa2

Handling of text documents does not comply with modern HTML spec
https://bugs.webkit.org/show_bug.cgi?id=244950
<rdar://problem/99719728>

Reviewed by Chris Dumez.

The spec language in https://html.spec.whatwg.org/multipage/browsing-the-web.html#read-text, indicates that Text documents
must be in no-quirks mode: (7.11.4.3 Set document's mode to "no-quirks".)

This is in conflict with the source code in the TextDocument constructor:

  setCompatibilityMode(DocumentCompatibilityMode::QuirksMode);

This causes the following WPT failure:

wpt /html/browsers/browsing-the-web/read-text/load-text-plain.html

* LayoutTests/imported/w3c/web-platform-tests/html/browsers/browsing-the-web/read-text/load-text-plain-expected.txt:
* LayoutTests/imported/w3c/web-platform-tests/IndexedDB/idbobjectstore_putall.tentative.any-expected.txt
* LayoutTests/imported/w3c/web-platform-tests/IndexedDB/idbobjectstore_putall.tentative.any.worker-expected.txt
* LayoutTests/imported/w3c/web-platform-tests/wasm/jsapi/global/value-set.any-expected.txt
* LayoutTests/imported/w3c/web-platform-tests/wasm/jsapi/global/value-set.any.worker-expected.txt
* LayoutTests/platform/glib/fast/loader/text-document-wrapping-expected.txt
* LayoutTests/platform/glib/imported/w3c/web-platform-tests/WebCryptoAPI/import_export/rsa_importKey.https.worker-expected.txt
* LayoutTests/platform/glib/imported/w3c/web-platform-tests/wasm/jsapi/global/value-set.any-expected.txt
* LayoutTests/platform/glib/imported/w3c/web-platform-tests/wasm/jsapi/global/value-set.any.worker-expected.txt
* LayoutTests/platform/gtk/fast/forms/targeted-frame-submission-expected.txt
* LayoutTests/platform/ios-wk2/fast/forms/targeted-frame-submission-expected.txt
* LayoutTests/platform/ios-wk2/fast/loader/text-document-wrapping-expected.txt
* LayoutTests/platform/ios/fast/forms/targeted-frame-submission-expected.txt
* LayoutTests/platform/ios/fast/loader/text-document-wrapping-expected.txt
* LayoutTests/platform/mac/fast/forms/targeted-frame-submission-expected.txt
* LayoutTests/platform/mac/fast/loader/text-document-wrapping-expected.txt
* LayoutTests/platform/mac/http/tests/misc/acid3-expected.txt
* LayoutTests/platform/win/fast/loader/text-document-wrapping-expected.txt
* LayoutTests/platform/wincairo/fast/loader/text-document-wrapping-expected.txt
* Source/WebCore/html/TextDocument.cpp:

Canonical link: https://commits.webkit.org/254389@main

68cde4c

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
	✅ 🛠 tv	✅ 🧪 mac-wk1
	✅ 🛠 tv-sim	✅ 🧪 mac-wk2
✅ 🛠 🧪 merge	✅ 🛠 watch	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 watch-sim	✅ 🧪 mac-wk2-stress

[webkit-early-warning-system]

EWS run on previous version of this PR (hash 90a576f)

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
	✅ 🛠 tv	❌ 🧪 mac-wk1
	✅ 🛠 tv-sim	❌ 🧪 mac-wk2
	✅ 🛠 watch	❌ 🧪 mac-AS-debug-wk2
	✅ 🛠 watch-sim	✅ 🧪 mac-wk2-stress

[brentfulgham]

It will be interesting to see if this change triggers any test failures in our own test cases. Waiting on EWS...

[webkit-early-warning-system]

EWS run on previous version of this PR (hash d10634a)

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
	✅ 🛠 tv	⏳ 🧪 mac-wk1
	⏳ 🛠 tv-sim	⏳ 🧪 mac-wk2
	✅ 🛠 watch	⏳ 🧪 mac-AS-debug-wk2
	✅ 🛠 watch-sim	⏳ 🧪 mac-wk2-stress

[webkit-early-warning-system]

68cde4c

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
	✅ 🛠 tv	✅ 🧪 mac-wk1
	✅ 🛠 tv-sim	✅ 🧪 mac-wk2
✅ 🛠 🧪 merge	✅ 🛠 watch	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 watch-sim	✅ 🧪 mac-wk2-stress

[cdumez]

LGTM

[webkit-commit-queue]

Committed 254389@main (e30caa2): https://commits.webkit.org/254389@main

Reviewed commits have been landed. Closing PR #4143 and removing active labels.