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-rw-r--r--dom/html/nsGenericHTMLElement.cpp40
1 files changed, 40 insertions, 0 deletions
diff --git a/dom/html/nsGenericHTMLElement.cpp b/dom/html/nsGenericHTMLElement.cpp
index d75001a83..2f890325a 100644
--- a/dom/html/nsGenericHTMLElement.cpp
+++ b/dom/html/nsGenericHTMLElement.cpp
@@ -108,6 +108,7 @@
#include "mozilla/StyleSetHandle.h"
#include "mozilla/StyleSetHandleInlines.h"
#include "ReferrerPolicy.h"
+#include "mozilla/dom/HTMLLabelElement.h"
using namespace mozilla;
using namespace mozilla::dom;
@@ -493,6 +494,14 @@ nsGenericHTMLElement::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
}
}
+ // We need to consider a labels element is moved to another subtree
+ // with different root, it needs to update labels list and its root
+ // as well.
+ nsDOMSlots* slots = GetExistingDOMSlots();
+ if (slots && slots->mLabelsList) {
+ slots->mLabelsList->MaybeResetRoot(SubtreeRoot());
+ }
+
return rv;
}
@@ -513,6 +522,13 @@ nsGenericHTMLElement::UnbindFromTree(bool aDeep, bool aNullParent)
}
}
+ // We need to consider a labels element is removed from tree,
+ // it needs to update labels list and its root as well.
+ nsDOMSlots* slots = GetExistingDOMSlots();
+ if (slots && slots->mLabelsList) {
+ slots->mLabelsList->MaybeResetRoot(SubtreeRoot());
+ }
+
nsStyledElement::UnbindFromTree(aDeep, aNullParent);
}
@@ -1701,6 +1717,30 @@ nsGenericHTMLElement::IsLabelable() const
return IsAnyOfHTMLElements(nsGkAtoms::progress, nsGkAtoms::meter);
}
+/* static */ bool
+nsGenericHTMLElement::MatchLabelsElement(Element* aElement, int32_t aNamespaceID,
+ nsIAtom* aAtom, void* aData)
+{
+ HTMLLabelElement* element = HTMLLabelElement::FromContent(aElement);
+ return element && element->GetControl() == aData;
+}
+
+already_AddRefed<nsINodeList>
+nsGenericHTMLElement::Labels()
+{
+ MOZ_ASSERT(IsLabelable(),
+ "Labels() only allow labelable elements to use it.");
+ nsDOMSlots* slots = DOMSlots();
+
+ if (!slots->mLabelsList) {
+ slots->mLabelsList = new nsLabelsNodeList(SubtreeRoot(), MatchLabelsElement,
+ nullptr, this);
+ }
+
+ RefPtr<nsLabelsNodeList> labels = slots->mLabelsList;
+ return labels.forget();
+}
+
bool
nsGenericHTMLElement::IsInteractiveHTMLContent(bool aIgnoreTabindex) const
{