fix(css): Prevent transforming @page properties like size #2341
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| @@ -368,7 +368,7 @@ export const css = | |||
| const x = styles[key as keyof typeof styles] | |||
| const val = typeof x === 'function' ? x(theme) : x | |||
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| if (val && typeof val === 'object') { | |||
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I agree that this is the implementation for the solution, but I'm very conflicted about having a special case for @page.
It feels bad, doesn't it? Could we maybe... choose a different solution?
There's no perfect solution here, but I suppose I'd rather resign from the size shorthand and add w and h shorthands in its place.
An alternative we could consider — could we just not implement anything?
There's an escape hatch with css prop, Safari doesn't support @page. Seems less correct than dropping the size alias, and we'd probably need an error thrown only in development, but it's something 🤷
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w/h shorthands will require changes by a significant percentage of Theme UI users & seems like a price they shouldn’t have to pay to me. The number of people using @page is likely tiny, & it’s very easy to update what code in the extremely rare case this change breaks it (imagine usages of that selector to find & replace vs “size” in a codebase). This isn’t very correct but it just doesn’t seem like a common issue to be sad about not getting your (screen-optimized) theme as automatically accessible in printing page setup for some browsers.
Closes #2166. This may not be ideal because it prevents transforms of all properties inside
@page, but the way our transform function is setup, it doesn't seem easy to fix otherwise. This means use of margin properties inside@pagewill no longer be transformed; in my experience you're only using those properties so you can define physical units likein&cminstead of pixels, so doesn't seem like a big deal to me.