<html>
<head>
<script>
if (window.testRunner)
testRunner.dumpAsText();
</script>
</head>
<style>
div {
border: 5px solid maroon;
-webkit-column-count: 2;
margin: 1em 0;
}
summary {
-webkit-column-span: all;
background-color: #eeeeee;
color: black;
}
</style>
<body onload="document.open(); document.write('PASS, does not crash'); document.close();">
<div>
<label>AAA
<summary>BBB
</div>
</body>
</html>