| <!DOCTYPE html> |
| <html> |
| <body> |
| <script src="../resources/runner.js"></script> |
| <script> |
| // Deep markup that exceeds the parser's max DOM tree depth (default 512), so the |
| // parser produces a long flat run of overflow siblings at the depth boundary. |
| // 100000 spans ~= 999500 overflow siblings, matching the regression magnitude observed |
| // in the original Mail thread (~15s render time pre-fix). |
| const depth = 100000; |
| let markup = "<!DOCTYPE html><body>"; |
| for (let i = 0; i < depth; ++i) |
| markup += "<span>"; |
| |
| let iframe; |
| |
| function setup() { |
| if (iframe) |
| document.body.removeChild(iframe); |
| iframe = document.createElement("iframe"); |
| iframe.sandbox = "allow-same-origin"; |
| document.body.appendChild(iframe); |
| iframe.contentDocument.open(); |
| iframe.contentDocument.write(markup); |
| iframe.contentDocument.close(); |
| } |
| |
| PerfTestRunner.measureTime({ |
| description: "Render time for deeply-nested HTML that exceeds the parser's max DOM tree depth and produces a long run of overflow siblings.", |
| setup: setup, |
| run: function () { |
| iframe.contentDocument.body.offsetHeight; |
| } |
| }); |
| </script> |
| </body> |
| </html> |
