Chromium also targets the document when a handler-bearing element is attached to the live page and removed before the CSP event is sent, so the readHTML filter alone (directive, source file, line, target document) could not tell that from the inert parse. The page now also records, with a MutationObserver on the live document, every element that enters the page carrying an on* attribute and every on* attribute set on an element in the page, and h.quiet() asserts the record is empty. The live-handler test gains a case for a handler attached and removed in the same turn, and checks per case that the observer saw the handler enter the page (not for the element never attached). Test-only; no product change.
jason.woltje
e71222d1a0