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chromium/third_party/blink/web_tests/fast/forms/validation-message-crash.html 

<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<iframe id="iframe"></iframe>
<script>
var t = async_test();
var repeat = 3;
function test() {
  if (repeat -- > 0)
    iframe.src = 'resources/validation-message-crash-iframe.html';
  else 
    t.done();
}
t.step(() => {
  iframe.onload = test;
  test();
});
</script>