Twenty Seventeen : CSS Warnings

[pitamdey]

In theme Twenty Seventeen,
we can see some warnings in style.css i.e.

• Also define the standard property 'appearance' for compatibility
• Also define the standard property 'backface-visibility' for compatibility

[pitamdey]

Patch for this issue

[abcd95]

Hey @pitamdey, Thanks for bringing this up.

Even though I observed these warnings for the Twenty Seventeen Theme, I am not sure whether this patch would be the best way to handle those.

Maybe we would need a second opinion on this.

[sabernhardt]

As mentioned on #61963, some CSS rules are "intentionally not cross-browser," so I will close this ticket too.

• The -webkit-appearance rules come from normalize.css, both for ​buttons and for ​search fields.
• On ​PR 213, Joe Fusco specifically said "I have included only the prefixed version of backface-visibility as this just happens in Chrome."