Add logical dimension values for touch-action property, since logical is/has shipped

[jonjohnjohnson]

https://w3c.github.io/pointerevents/#the-touch-action-css-property
https://drafts.csswg.org/css-logical-1/
https://caniuse.com/#feat=pointer
https://caniuse.com/#feat=css-logical-props

With Webkit being the last major vendor to work on pointer events, initially deployed in STP Release 67, as well as Edge being the only vendor without impending support for logical properties and values, it seems the touch-action property needs to be updated to accept a set of logical values.

cc @mbrubeck @atanassov

[patrickhlauke]

i assume you mean logical values for pan-x/pan-y in this case, right?

[jonjohnjohnson]

@patrickhlauke yep and any specifics of logical/physical language in the examples.

[NavidZ]

I guess this would also include pan-left/right/up/down in the extension doc.

[patrickhlauke]

I'll note that this is probably not so much about replacing those values, but complementing them with some form of logical axis/direction type values (that adapt to different writing systems etc). certainly pan-x/pan-y seem fine to me as they, in my mind at least, relate to the x/y coordinate system (which does not change for different writing systems) (as i see those being more low-level related to coordinates)

[jonjohnjohnson]

@patrickhlauke of course I hope it's only adding values, not replacing. No physical property/value has been replaced, only added afaik.

Even if someone does want to use scrolling/panning/interactions in the physical mapping, that's fine, but we also have a bunch of new ways to provide scrolling/panning/interactions that are related to a logical mapping. Think overflow-inline: scroll, scroll-snap-type: block, even if simply block/inline.

[patrickhlauke]

roughed out a potential addition here #496