4 border: 1px solid black;
11 <script src="../resources/runner.js"></script>
14 window.onload = function() {
15 var root = document.querySelector('#list').createShadowRoot();
16 root.appendChild(document.createElement('content'));
18 PerfTestRunner.measureTime({
19 description: "Measures performance of creating and rendering elements with shadow roots (contains class descendant selector styles).",
23 var frag = document.createDocumentFragment();
24 var tmpl = document.querySelector('#tmpl');
25 var start = PerfTestRunner.now();
28 frag.appendChild(tmpl.content.cloneNode(true));;
29 } while (++i < listSize);
30 document.querySelector('#list').appendChild(frag);
32 document.body.offsetHeight;
33 return PerfTestRunner.now() - start;
36 document.querySelector('#list').innerHTML = '';
43 <div class="bar baz">item</div>
46 <section id="list"></section>