| <!DOCTYPE html> |
| <html> |
| <head> |
| <script src="../resources/runner.js"></script> |
| <script src="resources/utils.js"></script> |
| </head> |
| <body> |
| </body> |
| <script> |
| createRegularDOMTree(); |
| PerfTestRunner.measureTime({ |
| description: "Measures the performance of a nth-child selector.", |
| run: function() { |
| var rule = applyCSSRule("div:nth-child(1) div { color: red; }"); |
| forceStyleRecalc(document.body); |
| rule.remove(); |
| forceStyleRecalc(document.body); |
| }, |
| tracingCategories: 'blink', |
| traceEventsToMeasure: [ |
| 'Document::updateStyle', |
| 'Document::recalcStyle', |
| 'Document::rebuildLayoutTree' |
| ] |
| }); |
| </script> |
| </html> |
