th content style and immediately check the height.
let t = test(function() {
  var div = document.createElement("div");
  div.setAttribute("style", "content: url('/images/blue.png')");
  div.setAttribute("width", "250");
  div.setAttribute("height", "100");
  document.body.appendChild(div);
  assert_equals(getComputedStyle(div).height, "0px");
}, "div with content style's width and height attributes are not used to infer aspect-ratio");

</script>
