Add CSS syntax patch for: `absolute-size`

[romainmenke]

Link to the definition in the spec

https://drafts.csswg.org/css-fonts-4/#font-size-prop

Syntax of the CSS construct

xx-small | x-small | small | medium | large | x-large | xx-large | xxx-large

Notes

See:

webref/ed/csspatches/syntax-patches.js

Lines 167 to 173 in b338f84

	// https://drafts.csswg.org/css2/#value-def-absolute-size
	// https://drafts.csswg.org/css2/#value-def-relative-size
	// https://drafts.csswg.org/css2/#value-def-shape
	"CSS2": {
	"<absolute-size>": `
	xx-small | x-small | small | medium |
	large | x-large | xx-large

I wasn't sure if the patch is incorrect or if maybe the patch should have been overridden by the later definition from css-fonts-4

[tidoust]

Oh. So the problem is that the css-fonts-4 spec fails to define the <absolute-type> type properly. It defines the construct as a value instead. That value links back to the definition of <absolute-type> in CSS2, which is incorrect as that version does not have xxx-large.

If there is a proper type definition in css-fonts-4, it will automatically override the definition in CSS2 in Webref. We'll still need a syntax patch, but that patch will then be for css-fonts-4, and not for CSS2.

I'll propose an update to css-fonts-4. I'd say it's fine to adjust the syntax patch to add xxx-large in the meantime, even if the patch needs to remain tied to the definition in CSS2 for the time being.