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<!DOCTYPE html>
<title>CSS Values and Units Test: line-height transition affecting lh units</title>
<link rel="help" href="https://www.w3.org/TR/css-values-4/#lh">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#target {
width: 20lh;
line-height: 10px;
transition: line-height 1s;
}
#target.lh {
line-height: 20px;
}
</style>
<div id="target"></div>
<script>
let t = async_test("lh unit length should change with transitioning line-height");
t.step(() => {
target.offsetTop;
target.className = "lh";
});
requestAnimationFrame(() => requestAnimationFrame(() => requestAnimationFrame(() => {
t.step(() => {
assert_not_equals(getComputedStyle(target).width, "200px");
assert_not_equals(getComputedStyle(target).width, "400px");
t.done();
}, "Transition should be progressing. Not at start/end.");
})));
</script>
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