layout/reftests/bugs/1563484-ref.html

   1 <!doctype html>
   2 <div style="font: message-box">
   3   System font text.
   4 </div>
   5 <script>
   6   let el = document.querySelector("div");
   7   el.style.fontSize = (2 * parseFloat(getComputedStyle(el).fontSize)) + "px";
   8 </script>