LayoutTests/fast/multicol/nested-multicol-with-spanner-and-continuation.html

<style>
.container { 
    columns: 2;
}
#innerContainer { 
    position: absolute;
    columns: 2;
}
</style>
PASS if no crash when the nested fragmented context is being destroyed with a spanner in it while forming a new continuation.
<div class=container><span><div id=innerContainer><div style="column-span: all;"></div></div></span></div><script>
if (window.testRunner)
    testRunner.dumpAsText();
document.body.offsetHeight;
innerContainer.style.position = "static";
innerContainer.style.webkitColumns = "1";
</script>