[Khalos]

This would be great, but would probably significantly hurt performance.

Especially if media queries come into play and we'd have to try different resolutions and ensure they're all the same.

[askmike]

> Especially if media queries come into play

Or even more simply: if your CSS is supposed to work on all pages of a website.

[bastawhiz]

And @supports, and vendor prefixes, and animations, and print styles, and IE hacks...