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| author | Matt A. Tobin <email@mattatobin.com> | 2020-04-17 05:01:17 -0400 |
|---|---|---|
| committer | Matt A. Tobin <email@mattatobin.com> | 2020-04-17 05:01:17 -0400 |
| commit | 0d362ca50335d964a78dbba7e7d32574ee67899a (patch) | |
| tree | 8b5de5f34019b97ad0b3c155c270a810608cd775 /layout/base/nsCSSFrameConstructor.cpp | |
| parent | de45820b64ab03768336c7242622ef9f499347cf (diff) | |
| download | UXP-0d362ca50335d964a78dbba7e7d32574ee67899a.tar UXP-0d362ca50335d964a78dbba7e7d32574ee67899a.tar.gz UXP-0d362ca50335d964a78dbba7e7d32574ee67899a.tar.lz UXP-0d362ca50335d964a78dbba7e7d32574ee67899a.tar.xz UXP-0d362ca50335d964a78dbba7e7d32574ee67899a.zip | |
Bug 1330843 - Allow JS to create NAC pseudo-elements
Tag #1375
Diffstat (limited to 'layout/base/nsCSSFrameConstructor.cpp')
| -rw-r--r-- | layout/base/nsCSSFrameConstructor.cpp | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/layout/base/nsCSSFrameConstructor.cpp b/layout/base/nsCSSFrameConstructor.cpp index 3be7c2a0b..b574e7690 100644 --- a/layout/base/nsCSSFrameConstructor.cpp +++ b/layout/base/nsCSSFrameConstructor.cpp @@ -5041,8 +5041,19 @@ nsCSSFrameConstructor::ResolveStyleContext(nsStyleContext* aParentStyleContext, aParentStyleContext); } } else { - MOZ_ASSERT(aOriginatingElementOrNull); MOZ_ASSERT(aContent->IsInNativeAnonymousSubtree()); + if (!aOriginatingElementOrNull) { + // For pseudo-implementing NAC created by JS using the ChromeOnly + // document.createElement(..., { pseudo: ... }) API, we find the + // originating element by lookup the tree until we find a non-NAC + // ancestor. (These are the correct semantics for C++-generated pseudo- + // implementing NAC as well, but for those cases we already have a + // correct originating element passed in.) + MOZ_ASSERT(nsCSSPseudoElements::PseudoElementIsJSCreatedNAC(pseudoType)); + aOriginatingElementOrNull = + nsContentUtils::GetClosestNonNativeAnonymousAncestor(aContent->AsElement()); + } + MOZ_ASSERT(aOriginatingElementOrNull); result = styleSet->ResolvePseudoElementStyle(aOriginatingElementOrNull, pseudoType, aParentStyleContext, |