<style>
    div.test { -webkit-column-width: 100px; }
    div.test > div { block-size: 100%; }
</style>
<div id="outerdiv" class="test">
    <div id="innerdiv"></div><div></div>
</div>
<script>
document.execCommand("SelectAll");
for (i=0;i<5;i++) {
var canvas = document.createElement("canvas");
document.getElementById("innerdiv").insertBefore(canvas, document.getElementById("innerdiv").appendChild(document.createElement("strong")));
var ctx = canvas.getContext("2d");
ctx.createImageData(1024, 65534);
}
</script>
<script>
head = document.getElementsByTagName("head")[0];
var style = document.createElement("style");
var rule = document.createTextNode("* { position: absolute;");
style.appendChild(rule);
head.appendChild(style);
var elem = document.getElementById("outerdiv");
elem.parentNode.removeChild(elem);
</script>