layout/reftests/bugs/1721223-1.html


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<!DOCTYPE html>
<style>
div {
  background: black;
  height: 2em;
  margin: 1em;
  float: left;
}
</style>

<!-- U+209B (subscript 's') is present in the macOS system font, so it should not render
     with the width of the hexbox produced by the U+FDD0 noncharacter. -->

<p>The two blocks should NOT be the same width:</p>

<div>&#xfdd0;&#xfdd0;&#xfdd0;&#xfdd0;&#xfdd0;</div> <!-- noncharacter (renders hexbox) -->

<div>&#x209b;&#x209b;&#x209b;&#x209b;&#x209b;</div> <!-- subscript letter s -->