css/css-values/lh-unit-005.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Values and Units Test: lh unit based on inherited line-height</title>
<link rel="help" href="https://drafts.csswg.org/css-values-4/#font-relative-lengths">
<link rel="help" href="https://crbug.com/1487480">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  #lh50, #lh100 {
    height: 1lh;
  }
</style>
<div style="line-height: 50px">
  <div id="lh50"></div>
</div>
<div style="line-height: 100px">
  <div id="lh100"></div>
</div>
<script>
  test(() => {
    assert_equals(getComputedStyle(lh50).height, "50px");
    assert_equals(getComputedStyle(lh100).height, "100px");
  }, "lh relative to line-height inherited from parent");
</script>