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Bug 1330843 - Allow JS to create NAC pseudo-elements

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Tag #1375
This commit is contained in:
Matt A. Tobin 2020-04-17 05:01:17 -04:00 • committed by Roy Tam
commit c37b4d0c63
8 changed files with 115 additions and 4 deletions
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7
layout/style/nsComputedDOMStyle.cpp
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@ -717,7 +717,9 @@ nsComputedDOMStyle::UpdateCurrentStyleSources(bool aNeedsLayoutFlush)
// We want to check that going through this path because of
// HasPseudoElementData is rare, because it slows us down a good
// bit. So check that we're really inside something associated
// with a pseudo-element that contains elements.
// with a pseudo-element that contains elements. (We also allow
// the element to be NAC, just in case some chrome JS calls
// getComputedStyle on a NAC-implemented pseudo.)
nsStyleContext* topWithPseudoElementData = mStyleContext;
while (topWithPseudoElementData->GetParent()->HasPseudoElementData()) {
topWithPseudoElementData = topWithPseudoElementData->GetParent();
@ -728,7 +730,8 @@ nsComputedDOMStyle::UpdateCurrentStyleSources(bool aNeedsLayoutFlush)
NS_LITERAL_STRING("we should be in a pseudo-element that is expected to contain elements ("));
assertMsg.Append(nsDependentString(pseudoAtom->GetUTF16String()));
assertMsg.Append(')');
NS_ASSERTION(nsCSSPseudoElements::PseudoElementContainsElements(pseudo),
NS_ASSERTION(nsCSSPseudoElements::PseudoElementContainsElements(pseudo) ||
mElement->IsNativeAnonymous(),
NS_LossyConvertUTF16toASCII(assertMsg).get());
}
#endif