<!DOCTYPE html>
<link rel=author href="mailto:jarhar@chromium.org">
<link rel=help href="https://github.com/w3c/csswg-drafts/issues/4441">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/css-animations/support/testcommon.js"></script>

<div id=target1 class=target>hello</div>
<div id=target2 class=target>hello</div>

<style>
.target {
  float: left;
  width: 100px;
  height: 100px;
}
.target.animated {
  float: right;
}

#target1 {
  transition: all 1s, float 1s;
}

#target2 {
  transition: all 1s;
}
</style>

<script>
promise_test(async () => {
  let transitionstartFired = false;
  target1.addEventListener('transitionstart', () => {
    transitionstartFired = true;
  });
  await waitForAnimationFrames(2);
  target1.classList.add('animated');
  await waitForAnimationFrames(1);
  assert_true(transitionstartFired);
}, 'all with an explicit discrete property should animate.');

promise_test(async () => {
  let transitionstartFired = false;
  target2.addEventListener('transitionstart', () => {
    transitionstartFired = true;
  });
  await waitForAnimationFrames(2);
  target2.classList.add('animated');
  await waitForAnimationFrames(1);
  assert_false(transitionstartFired);
}, 'all without an explicit discrete property should not animate.');
</script>
