[forms] Don't include <compat-auto> appearance tests for square-button / push-button / slider-horizontal

[emilio]

Test List

• https://wpt.fyi/results/css/css-ui/appearance-push-button-001.html
• https://wpt.fyi/results/css/css-ui/webkit-appearance-push-button-001.html
• https://wpt.fyi/results//css/css-ui/appearance-slider-horizontal-001.html
• https://wpt.fyi/results//css/css-ui/webkit-appearance-slider-horizontal-001.html
• https://wpt.fyi/results//css/css-ui/appearance-square-button-001.html
• https://wpt.fyi/results//css/css-ui/webkit-appearance-square-button-001.html

Rationale

These are tests for legacy values that are supposedly needed for compat:

https://drafts.csswg.org/css-ui-4/#typedef-appearance-compat-auto:

If any of these values are not needed for web compat, they should be dropped from this list; conversely, any value needed for compat not included in this list should be added.

Firefox doesn't implement these and we haven't seen any compat issue, so I'm proposing getting these removed from the spec in w3c/csswg-drafts#8506.

I don't think we want to implement these just for the sake of passing these tests, so I'd rather get them removed from the interop dashboard (or even from wpt altogether maybe).

[nt1m]

I would wait on w3c/csswg-drafts#8506 and remove these tests altogether from WPT if relevant.

[jgraham]

Arguably if these properties are little used, and we don't expect/want that to change, we could remove the tests from interop either way. But it also seems fine to wait and see what the CSS-WG decision is.

[foolip]

@emilio we discussed this briefly in the interop team meeting today. This is blocked on w3c/csswg-drafts#8506, can you pull some strings to get it on the agenda in a meeting soon?

[foolip]

There's a resolution for w3c/csswg-drafts#8506 now. @emilio do you think we can update the tests right away, or wait for spec edit?

[emilio]

We can probably just update the tests right away.

[zcorpan]

• Spec change: [css-ui] Remove slider-horizontal, square-button, push-button from <compat-auto> w3c/csswg-drafts#8877
• Tests change: [css-ui] slider-horizontal, square-button, push-button are now invalid wpt#40233

[foolip]

Tusen tack @zcorpan!