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<!DOCTYPE html>
<link rel=help href="mailto:jarhar@chromium.org">
<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>
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