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I'm curious: is there a ready-to-use set of tests for a layout engine that checks conformance with the specs? Something that you could, without much effort, run against a toy layout engine you'd write?

I know Webkit/Blink have humongous test suites, but these probably aren't easy to adapt to a toy layout engine.

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There's something like Acid3, but it doesn't give you information as to what failed when you get a less-than-perfect score. (Test: http://acid3.acidtests.org/ | Information: http://www.webstandards.org/action/acid3/)

There are also all those other browser benchmarks (e.g. http://peacekeeper.futuremark.com/), but those include things other than the layout engine, such as javascript performance, webGL, etc. You could try poking around a few of them and only looking at the CSS and DOM sections though (http://web.basemark.com/).

W3C Web Platform Tests probably would be best starting point.

http://testthewebforward.org/

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