wpt / css / css-viewport / zoom / font-size-keyword-system-font.html

Status: PASS | Duration: 47ms | Subtests: 1/1 | Open test on wpt.live | wpt.fyi

TestTest Source

/css/css-viewport/zoom/font-size-keyword-system-font.html

<!DOCTYPE html>
<title>CSS zoom applies to font-size when specified via system font keyword</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="help" href="https://drafts.csswg.org/css-viewport/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#ref, #target {
  font: menu;
  width: 1em;
  height: 1em;
}
#target {
  zoom: 2;
}
</style>
<div id="ref">Reference</div>
<div id="target">Target</div>
<script>
test(function() {
  const unzoomedComputedSize = parseFloat(getComputedStyle(ref).fontSize);
  assert_greater_than(unzoomedComputedSize, 0, "system font should have a positive font-size");
  const zoomedComputedSize = parseFloat(getComputedStyle(target).fontSize);
  assert_equals(zoomedComputedSize, unzoomedComputedSize, "computed style should be the same");

  const unzoomedWidth = ref.getBoundingClientRect().width;
  const zoomedWidth = target.getBoundingClientRect().width;
  assert_approx_equals(zoomedWidth, 2 * unzoomedWidth, 0.1);
}, "zoom scales font-size set via system font keyword");
</script>