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chromium/third_party/blink/web_tests/fast/hidpi/static/calendar-picker-appearance.html 

<!DOCTYPE html>
<script src="../../../resources/testdriver.js"></script>
<script src="../../../resources/testdriver-vendor.js"></script>
<script src="../../forms/resources/picker-common.js"></script>

<input type=date value="10000-12-31">

<script>
  window.onload = openPickerAppearanceOnly(document.querySelector('select'));
</script>