dom: invalidate node list caches on class attribute mutations - #23501
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iliaal wants to merge 1 commit into
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dom: invalidate node list caches on class attribute mutations#23501iliaal wants to merge 1 commit into
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Reflected attribute writes such as className and id, classList mutations, and removeAttribute()/removeAttributeNS()/removeAttributeNode() modified attributes without bumping the document cache tag, so live HTMLCollection caches like getElementsByClassName() kept serving stale lengths and items. Invalidate the node list caches at every one of these mutation points. Sibling audit: Attr:: writes, setAttribute(), setAttributeNode() and setAttributeNS() already invalidate; php_dom_ns_compat_mark_attribute() only mirrors namespace declarations during reconciliation and is not user-visible.
devnexen
approved these changes
Aug 29, 2026
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Mutating an element class through the reflected className property, classList mutations, or removeAttribute(), removeAttributeNS() and removeAttributeNode() modified the underlying attribute without bumping the document cache tag, so live collections such as getElementsByClassName() kept returning stale lengths and items afterwards. Each of these mutation points now invalidates the node list caches with php_libxml_invalidate_node_list_cache(). Attr::$value, setAttributeNode and setAttributeNS were audited and already invalidate correctly.