| <!doctype html> |
| <style> |
| div { |
| color: orange; |
| } |
| </style> |
| <script src="../resources/runner.js"></script> |
| <script> |
| var listSize = 100; |
| window.onload = function() { |
| PerfTestRunner.measureTime({ |
| description: "Measures performance of creating and rendering elements with shadow roots from templates (contains class descendant selector styles).", |
| run: function() { |
| var list = document.querySelector('#list'); |
| var tmpl = document.querySelector("#tmpl"); |
| list.innerHTML = ''; |
| var start = PerfTestRunner.now(); |
| var i = 0; |
| do { |
| var host = document.createElement('div'); |
| var root = host.createShadowRoot(); |
| root.appendChild(tmpl.content.cloneNode(true)); |
| var light = document.createElement('div'); |
| list.appendChild(host); |
| } while (++i < listSize); |
| |
| PerfTestRunner.forceLayout(); |
| return PerfTestRunner.now() - start; |
| } |
| }); |
| } |
| </script> |
| <template id="tmpl"> |
| <style> |
| .foo .bar .foo.bar.baz { |
| color: blue; |
| } |
| .bar.baz { |
| color: red; |
| } |
| </style> |
| <div class="foo"> |
| <div class="bar"> |
| <div class="foo bar baz">item</div> |
| </div> |
| </div> |
| <content></content> |
| </template> |
| <section id="list"></section> |
