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What is the issue with the DOM Standard?
When the attributesFilter property is used for a MutationObserver, attributes with namespaces are unconditionally excluded from getting mutation records:
https://dom.spec.whatwg.org/#queueing-a-mutation-record
type is "attributes", options["attributeFilter"] exists, and options["attributeFilter"] does not contain name or namespace is non-null
I don't know any of the history here, but this capability was asked for here: https://issues.chromium.org/issues/392661412
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