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chromium/third_party/blink/web_tests/external/wpt/css/css-animations/animation-base-response-003.html 

<!DOCTYPE html>
<title>Tests that identical elements in the base style responds to font-size animation</title>
<link rel="help" href="https://drafts.csswg.org/css-animations/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  @keyframes font_size_animation {
    from { font-size: 10px; }
    to { font-size: 20px; }
  }
  div {
    font-size: 1px;
    min-width: 1em;
    animation: font_size_animation steps(2, end) 1000s -500s;
  }
</style>
<div></div>
<div></div>
<div></div>
<script>
test(() => {
  let divs = document.querySelectorAll('div');
  for (let div of divs)
    assert_equals(getComputedStyle(div).getPropertyValue('min-width'), '15px');
}, 'Identical elements are all responsive to font-size animation');
</script>