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Test Info:

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id='container'>
<div id='element'></div>
</div>
<script>
var element = document.getElementById('element');
var container = document.getElementById('container');
test(function() {
element.style.fontSize = '10px';
container.style.width = '1000px';
var player = element.animate([{left: 'calc(100px + 80%)'}, {left: '10em'}], 10);
player.pause();
player.currentTime = 5;
assert_equals(getComputedStyle(element).left, 'calc(40% + 100px)');
element.style.fontSize = '20px';
assert_equals(getComputedStyle(element).left, 'calc(40% + 150px)');
container.style.width = '500px';
assert_equals(getComputedStyle(element).left, 'calc(40% + 150px)');
}, 'Lengths responsive to style changes');
test(function() {
container.style.width = '1000px';
var player = element.animate([{paddingTop: '30%'}, {paddingTop: '50%'}], 10);
player.pause();
player.currentTime = 5;
container.style.width = '700px';
assert_equals(getComputedStyle(element).paddingTop, '280px');
}, 'Percentages responsive to width style changes');
test(function() {
element.style.fontSize = '1px';
var player = element.animate([{lineHeight: '9'}, {lineHeight: '13'}], 10);
player.pause();
player.currentTime = 2.5;
element.style.fontSize = '7px';
assert_equals(getComputedStyle(element).lineHeight, '70px');
}, 'Numbers responsive to style changes');
</script>