371043-1.html - mozsearch

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<!DOCTYPE html>

<body>

  <div id="source" style="font-size: 10px; column-gap: 2ch">

    <span id="test"

          style="background: green; display: inline-block; height: 30px;

                 padding: 0 2px">

    </span>

    <script>

      document.getElementById("test").style.width =

        document.defaultView.getComputedStyle(document.getElementById("source")).columnGap;

    </script>

  </div>

</body>