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The CSSWG ended up disagreeing with my attempt to define the hashless-color and unitless-length quirks in the Syntax spec, preferring them to be handled at the value/property level. As such, we should define them here in the Quirks Mode spec again, and then CSS specs will ref it as necessary. I'd prefer this to be done by defining <quirky-color> and <quirky-length> productions, along with a list of properties affected by the quirk and their new grammars using the above productions. The only non-trivial grammar is for 'font', as an bare number might be a <quirky-length> for font-size or a <number> for line-height, depending on whether an explicit <length> for font-size also appears in the property value or not.
The current/previous spec excluded 'font' from supporting the quirk.
Ah, you're right, and the 'font' property is crazy anyway - numbers that are multiples of 100 might be font-weight values, too. So, ignore 'font'.
https://github.com/whatwg/quirks/commit/3aa39691b2a2f060d2c5c2ad8b7e05bfb82f0c7e http://quirks.spec.whatwg.org/#the-hashless-hex-color-quirk Does that make sense? (I haven't specced quirky lengths yet.)
Yep, looks great to me.
Relevant commits https://github.com/whatwg/quirks/commit/3aa39691b2a2f060d2c5c2ad8b7e05bfb82f0c7e https://github.com/whatwg/quirks/commit/5ded3430fe7fb139e0c275643b004511efb813a2 https://github.com/whatwg/quirks/commit/5c15baf3f38ee36709eb08b2daa70e5db67a1022 https://github.com/whatwg/quirks/commit/a217c67991e7b4858bcf53a74f04294cf1354a85
Looks good to me!