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chromium/third_party/blink/web_tests/external/wpt/css/css-viewport/zoom/resources/leaf.html 

<!DOCTYPE html>
<style>
body {
  background-color: aqua;
  --target-width: 32px;
  --target-height: 24px;
  --scale: 1;
  margin: calc(18px * var(--scale));
}
#target {
  width: calc(var(--target-width) * var(--scale));
  height: calc(var(--target-height) * var(--scale));
  background-color: hotpink;
}
</style>

<div id="target"></div>

<script>
let params = new URLSearchParams(location.search);
if (params.has("scale")) {
  document.body.style.setProperty("--scale", parseFloat(params.get("scale")));
}
</script>