chromium/third_party/blink/web_tests/http/tests/html/validation-bubble-oopif-long-message-expected.html

<!DOCTYPE html>
<p>Cross origin validation bubbles should be truncated.</p>
<iframe src="http://127.0.0.1:8000/html/resources/validation-bubble-oopif-long-message-iframe-truncated.html"></iframe>