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Bug 1396584 - Remove support for multiple ShadowRoots

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Tag #1375
This commit is contained in:
Matt A. Tobin 2020-04-17 06:34:38 -04:00 • committed by Roy Tam
commit 5917636e83
44 changed files with 334 additions and 1955 deletions
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22
dom/base/Element.cpp
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@ -1095,6 +1095,11 @@ Element::RemoveFromIdTable()
already_AddRefed<ShadowRoot>
Element::CreateShadowRoot(ErrorResult& aError)
{
if (GetShadowRoot()) {
aError.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return nullptr;
}
nsAutoScriptBlocker scriptBlocker;
RefPtr<mozilla::dom::NodeInfo> nodeInfo;
@ -1131,24 +1136,7 @@ Element::CreateShadowRoot(ErrorResult& aError)
shadowRoot->SetIsComposedDocParticipant(IsInComposedDoc());
// Replace the old ShadowRoot with the new one and let the old
// ShadowRoot know about the younger ShadowRoot because the old
// ShadowRoot is projected into the younger ShadowRoot's shadow
// insertion point (if it exists).
ShadowRoot* olderShadow = GetShadowRoot();
SetShadowRoot(shadowRoot);
if (olderShadow) {
olderShadow->SetYoungerShadow(shadowRoot);
// Unbind children of older shadow root because they
// are no longer in the composed tree.
for (nsIContent* child = olderShadow->GetFirstChild(); child;
child = child->GetNextSibling()) {
child->UnbindFromTree(true, false);
}
olderShadow->SetIsComposedDocParticipant(false);
}
// xblBinding takes ownership of docInfo.
RefPtr<nsXBLBinding> xblBinding = new nsXBLBinding(shadowRoot, protoBinding);