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Run html5lib-tests against real browsers #188
Description
Hi,
Not sure if this is relevant to post here, feel free to close, but thought it might be helpful.
I've set up a testing bench where html5lib-tests can be run against three modern browser engines: Chromium, Webkit, Firefox: https://github.com/EmilStenstrom/justhtml-html5lib-tests-bench/
Results are pretty good!
| Engine | Tests Passed | Agreement | Notes |
|---|---|---|---|
| Chromium 143.0.7499.4 | 1763/1770 | 99.6% | 7 differing trees |
| WebKit 26.0 | 1741/1770 | 98.4% | 29 differing trees |
| Firefox 144.0.2 | 1727/1770 | 97.6% | 43 differing trees |
Activity
annevk commentedon Dec 30, 2025
Is that stable Safari? Safari Technology Preview should pass a couple more. See also https://wpt.fyi/results/html/syntax/parsing which does the same kind of thing.
EmilStenstrom commentedon Dec 30, 2025
@annevk Updated the table above. The latest version available from Playwright: Webkit 26.0. How this compares to Safari Preview 26.3 is very unclear to me. Do updates land in webkit first, then in safari-preview?
For what it's worth, the above runs across all browsers in 9 seconds :)
sideshowbarker commentedon Dec 30, 2025
FYI for the Gecko/Firefox HTML parser, I’ve got a couple of patches in the pipeline that’ll get us passing more tests there —