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<!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>
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