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Issue #2732 - Part 3: Explicitly search for <area> only.

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Relying on the implicit conversion by `::FromContent` doesn't work for
us because we inherit that from `nsGenericHTMLElement` and isn't specific
to `HTMLAreaElement`, so it would accept other elements.

This also updates the Attribute changed event handler to exclude `<a>`
elements and cleans up an unused variable from the old code.
This commit is contained in:
Moonchild 2025-04-25 20:29:05 +02:00 • committed by roytam1
commit 8ae2b45691
1 changed files with 5 additions and 7 deletions
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12
layout/generic/nsImageMap.cpp
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@ -751,16 +751,15 @@ nsImageMap::Init(nsImageFrame* aImageFrame, nsIContent* aMap)
void
nsImageMap::SearchForAreas(nsIContent* aParent)
{
uint32_t n = aParent->GetChildCount();
// Look for <area> elements.
for (nsIContent* child = aParent->GetFirstChild();
child;
child = child->GetNextSibling()) {
if (auto* area = static_cast<HTMLAreaElement*>(HTMLAreaElement::FromContent(child))) {
if (child->IsHTMLElement(nsGkAtoms::area)) {
HTMLAreaElement* area = static_cast<HTMLAreaElement*>(HTMLAreaElement::FromContent(child));
AddArea(area);
// Continue to next child. This stops mConsiderWholeSubtree from
// Continue to next sibling. This stops mConsiderWholeSubtree from
// getting set. It also makes us ignore children of <area>s which
// is consistent with how we react to dynamic insertion of such
// children.
@ -895,11 +894,10 @@ nsImageMap::AttributeChanged(nsIDocument* aDocument,
const nsAttrValue* aOldValue)
{
// If the parent of the changing content node is our map then update
// the map. But only do this if the node is an HTML <area> or <a>
// the map. But only do this if the node is an HTML <area>
// and the attribute that's changing is "shape" or "coords" -- those
// are the only cases we care about.
if ((aElement->NodeInfo()->Equals(nsGkAtoms::area) ||
aElement->NodeInfo()->Equals(nsGkAtoms::a)) &&
if (aElement->NodeInfo()->Equals(nsGkAtoms::area) &&
aElement->IsHTMLElement() &&
aNameSpaceID == kNameSpaceID_None &&
(aAttribute == nsGkAtoms::shape ||