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chromium/third_party/blink/web_tests/fast/forms/date/date-chooseronly-defaultValue.html 

<!DOCTYPE html>
<!-- A test for crbug.com/838898. defaultValue setter should invalidate view. -->
<body>
<input type="date">
<script>
document.querySelector('input').defaultValue = '2015-07-25';
</script>
</body>