<!DOCTYPE html>
<p>Insert a spanner after another spanner and before existing multicol content. The other spanner has a multicol container with yet another spanner inside.</p>
<p>PASS if no crash or assertion failure.</p>
<div style="-webkit-column-count:3;">
<div style="-webkit-column-span:all;">
<div style="-webkit-column-count:2;">
<div style="-webkit-column-span:all;"></div>
</div>
</div>
<div id="willBecomeSpanner"></div>
</div>
<script>
if (window.testRunner)
testRunner.dumpAsText();
document.body.offsetTop;
document.getElementById("willBecomeSpanner").style.webkitColumnSpan = "all";
</script>