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chromium/third_party/blink/web_tests/wpt_internal/css/css-fonts/default-serif-apostrophe.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Apostrophe doesn't add excessive spacing with default serif font</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  .serif {
      font-size: 40px;
      font-family: serif;
      background: gray;
  }
</style>
<span id="div_apostrophe" class="serif">A’B</span><br/>
<span id="div_underscore" class="serif">A_B</span>
<script>
  function WidthOf(id) {
      return document.getElementById(id).getBoundingClientRect().width;
  };
  test(() => {
      assert_less_than(WidthOf("div_apostrophe"), WidthOf("div_underscore"));
  });
</script>