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Test Info:

<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>