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chromium/third_party/blink/web_tests/fast/forms/calendar-picker/date-picker-open-with-space-key.html 

<!DOCTYPE html>
<meta name=fuzzy content="maxDifference=0-3; totalPixels=0-1000">
<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>


<input type=date id=date value="2019-09-10">

<script>

test(() => {
  document.getElementById('date').focus();
  eventSender.keyDown(" ");
  assert_not_equals(internals.pagePopupWindow, null);
}, "Test opening date picker with Space key.");

</script>