<!DOCTYPE html>
<link rel="stylesheet" href="resource-use.css">
<!-- these first few elements will get a backdrop layer -->
<div></div>
<div><div></div></div>
<div></div>
<div><div><div><div></div></div></div></div>
<div></div>
<div></div>
<!-- and by here we're exceeding the limits, so they won't get a backdrop layer -->
<div><div></div></div>
<div></div>
<script src="layer-tree-as-text.js"></script>