159489 2016-07-06 13:51:39 -0700 iframe srcdoc with quirky doctype should be no-quirks mode 2022-08-11 02:15:40 -0700 1 1 1 Unclassified WebKit DOM WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 zcorpan rniwa ahmad.saleem792 ap bfulgham cdumez rniwa webkit-bug-importer oldest_to_newest 1208376 0 zcorpan 2016-07-06 13:51:39 -0700 http://software.hixie.ch/utilities/js/live-dom-viewer/saved/4303 <iframe srcdoc="<!doctype x>"> The srcdoc document should always be in no-quirks mode, regardless of the doctype. In WebKit if there's a quirky doctype it triggers quirks mode. https://html.spec.whatwg.org/multipage/syntax.html#the-initial-insertion-mode 1889845 1 ahmad.saleem792 2022-08-08 16:54:18 -0700 I am able to reproduce this bug in Safari 15.6 on macOS 12.5 using attached test case, where it shows "BackCompat" mode for Safari in logs, while CSS1Compat mode for Firefox Nightly 105 and Chrome Canary 106. Thanks! 1889846 2 ahmad.saleem792 2022-08-08 16:55:43 -0700 *** Safari 15.6 on macOS 12.5 *** log: BackCompat rendering mode: CSS1Compat document has no title *** Firefox Nightly 105 *** log: CSS1Compat rendering mode: CSS1Compat document has no title *** Chrome Canary 106 *** log: CSS1Compat rendering mode: CSS1Compat document has no title 1890358 3 webkit-bug-importer 2022-08-10 11:05:54 -0700 <rdar://problem/98460686> 1890369 4 rniwa 2022-08-10 12:15:43 -0700 Oh, we have a check for this in HTMLConstructionSite::setDefaultCompatibilityMode() but we're missing one in HTMLConstructionSite::setCompatibilityModeFromDoctype 1890378 5 rniwa 2022-08-10 13:10:20 -0700 Pull request: https://github.com/WebKit/WebKit/pull/3199 1890520 6 ews-feeder 2022-08-11 02:15:38 -0700 Committed 253326@main (4401d4e5b5d9): <https://commits.webkit.org/253326@main> Reviewed commits have been landed. Closing PR #3199 and removing active labels.