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<html>
<head>
  <style>
    div:first-letter {
      float: left;
      background: orange;
    }
    /* Note: there's an upper-bound on widths that trigger a crash.
       This bound depends on the width of the characters in the div. */
    div#v {
      column-count: 2;
      width: 30px;
      height: 1em;
      background: lightblue;
    }
  </style>
  <script>
    function boom() {
      var v = document.getElementById("v");
      // Note: This seems to crash regardless of what the text node is;
      // e.g. it can be the empty string, a space character, or any number of
      // other characters.
      v.appendChild(document.createTextNode("CRASH"));
    }
  </script>
</head>
<body onload="boom();"><div id="v">a b</div></body>
</html>