chromium/third_party/blink/web_tests/external/wpt/css/css-viewport/zoom/reference/text-underline-offset-ref.html

<!DOCTYPE html>
<title>CSS zoom applies to text-underline-offset when specified and inherited</title>
<link rel="author" title="Stefan Zager" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-viewport/">

<style>
body {
  --scale: 1;
}
div {
  font-size: calc(1rem * var(--scale));
  text-decoration: underline hotpink;
  text-underline-offset: calc(5px * var(--scale));
}
.zoom {
  --scale: 2;
}
</style>

<div>unzoomed</div>
<div class="zoom">zoomed</div>
<div class="zoom">zoomed inherited</div>