Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/external/wpt/css/css-transitions/display-none-no-animations.html 

<!DOCTYPE html>
<link rel=help href="mailto:[email protected]">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<div id=target>target</div>
<style>
#target {
  display: none;
  transition: 1s;
  color: red;
}
#target.animated {
  transition: 1s;
  color: green;
}
</style>

<script>
test(() => {
  target.addEventListener('transitionstart', () => {
    assert_unreached('transitionstart should not be fired.');
  });
  target.classList.add('animated');
  assert_equals(target.getAnimations().length, 0,
    'There should not be any animations running.');
}, 'Transitions and animations should not occur on display:none elements.');
</script>