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jcmoore/gist:44b117ce6cd6ab4630f3

Created July 11, 2014 22:09
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Polymer DOM selection over many divs (hangs on FFv30)
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gistfile1.txt
<html class="no-js -webkit-" lang="en"><!--<![endif]-->
<!-- Problem avoided if platform.js is not loaded -->
<script language="javascript" src="http://cdnjs.cloudflare.com/ajax/libs/polymer/0.3.3/platform.js"></script>
<script type="text/javascript">
// version of platform.js does not seem to matter (in Firefox -- v30 for instance)
document.addEventListener('DOMContentLoaded', attempt);
function attempt () {
setTimeout(function () {
console.log("("+Date.now()+") hang starts in 3 seconds -- scroll around to see effects");
setTimeout(function () {
console.log("("+Date.now()+") hanging very soon");
setTimeout(function () {
var count = 50,
index = 0;
console.log("("+Date.now()+") hang up");
for (index = 0; index < count; index++) {
// any of the following
// will take a long time
//document.getElementsByTagName("notatag");
//document.getElementsByClassName("notaclass");
//document.getElementsByName("notaname");
document.querySelectorAll("notaselector");
}
console.log("("+Date.now()+") hang over");
}, 200);
}, 3000);
}, 0);
}
// static m&m screen below
// list campaigns
</script>
<body>
<script type="text/javascript">
(function () {
var count = 9001,
index = 0,
child = null;
for (index = 0; index < count; index++) {
child = document.createElement("DIV");
child.innerHTML = Date.now() + "" + Math.random();
//child.setAttribute("id", Date.now() + "" + Math.random());
document.body.appendChild(child);
}
}) ();
</script>
</body>
</html>
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