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Test Info:

<!DOCTYPE html>
<title>Tests that base responds to font-affecting properties appearing via setKeyframes</title>
<link rel="help" href="https://drafts.csswg.org/css-animations/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#target1 {
font-size: 10px;
height: 1em;
}
</style>
<div id=target1></div>
<script>
test(function() {
getComputedStyle(target1).height;
let animation = target1.animate([
{ height: '50px' },
{ height: '100px' },
], {
duration: 1000000,
delay: -500000,
easing: 'steps(2, end)'
});
assert_equals(getComputedStyle(target1).height, '75px');
animation.effect.setKeyframes([
{ fontSize: '10px' },
{ fontSize: '20px' },
]);
assert_equals(getComputedStyle(target1).height, '15px');
}, 'Base is responsive to font-affecting appearing via setKeyframes');
</script>