chromium/third_party/blink/web_tests/dom/mutation-event-tests/fast/forms/week-multiple-fields-no-shadow-event.html

<!DOCTYPE html>
<body>
<script src="../../../../resources/js-test.js"></script>
<script>
var input = document.createElement("input");
var passed = true;
input.type = "week";
input.addEventListener("DOMCharacterDataModified", function() {
  passed = false;
  testFailed("DOMCharacterDataModified event should not be visible.");
});

input.value = "2015-W10";
if (passed) {
  testPassed("event did not get triggered.");
}
</script>
</body>