http://w3c-test.org/html/semantics/embedded-content/the-img-element/invalid-src.html WPT PR to change the test slightly: https://github.com/web-platform-tests/wpt/pull/11304 Spec: https://html.spec.whatwg.org/multipage/images.html#updating-the-image-data:parse-a-url-2 The error event is not fired when the URL fails to parse.
Appears to pass and not timeout now. Probably because of https://github.com/web-platform-tests/wpt/commit/c23028ea6703236331a486258ba9a7a750e86722.