Intent to prototype and ship: text-align: -webkit-{left,right,center} aliases

[Emilio Cobos Álvarez]

Summary: Expose text-align values -webkit-left/right/center.

We have the -moz- prefixed equivalents, and some sites only specify the -webkit- prefixed version.

These are used in the implementation of the html align attribute, so they're reasonably interoperable and not going anywhere. Given that, it's probably easier for us and for authors to support the -webkit- prefixed keywords.

I filed:

 * https://github.com/w3c/csswg-drafts/issues/10388

 * https://github.com/whatwg/html/issues/10391

To try to sort this out in spec-land. If that progresses, we should make the -webkit- keywords the canonical ones, presumably, but I'm not doing that yet.

Bug: https://bugzil.la/1899042

Pref: None (trivial-ish, extremely unlikely to cause issues)

Spec: See above

Other browsers: Shipping

Cheers,

 -- Emilio