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chromium/third_party/blink/web_tests/external/wpt/html/semantics/forms/the-selectlist-element/selectlist-pseudo-light-dismiss-invalidation.tentative.html 

<!DOCTYPE html>
<link rel=author href="mailto:[email protected]">
<link rel=help href="http://crbug.com/1429839">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>

<selectlist id=selectlist>
  <option id=optone>one</option>
  <option id=opttwo>two</option>
</selectlist>
<style>
selectlist {
  background-color: rgb(0, 0, 255);
}
selectlist:closed {
  background-color: rgb(0, 255, 0);
}
selectlist:open {
  background-color: rgb(255, 0, 0);
}
</style>
<button id=button>hello world</button>

<script>
promise_test(async () => {
  assert_equals(getComputedStyle(selectlist).backgroundColor, 'rgb(0, 255, 0)',
    'The selectlist should match :closed at the start of the test.');

  await test_driver.click(selectlist);
  assert_equals(getComputedStyle(selectlist).backgroundColor, 'rgb(255, 0, 0)',
    'The selectlist should match :open when opened.');

  await test_driver.click(opttwo);
  assert_equals(getComputedStyle(selectlist).backgroundColor, 'rgb(0, 255, 0)',
    'The selectlist should match :closed after clicking an option.');

  await test_driver.click(selectlist);
  assert_equals(getComputedStyle(selectlist).backgroundColor, 'rgb(255, 0, 0)',
    'The selectlist should match :open when reopened.');

  await test_driver.click(button);
  assert_equals(getComputedStyle(selectlist).backgroundColor, 'rgb(0, 255, 0)',
    'The selectlist should match :closed after light dismiss.');
}, 'selectlist should not match :open when light dismissed.');
</script>