Re: [css-writing-modes] computed value for text-orientation: sideways or sideways-right

The original topic is just about serialization, used in getComputedStyle()
and a few other places. Jonathan might need to resolve it now, and I need
it too very soon. Can we simply straw poll on the next conf call, resolve,
and do other discussions after that?

<div id=a style="text-orientation:sideways"></div>
<div id=b style="text-orientation:sideways-right"></div>
<script>
console.log(getComputedStyle(a).style.textOrientation);
console.log(getComputedStyle(b).style.textOrientation);
</script>

Option A: it prints "sideways" and "sideways-right"
Option B: it prints "sideways" and "sideways"
Option C: it prints "sideways-right" and "sideways-right"

Current situation:
* Jonathan, Florian, and I prefer B.
* Takao prefers C.
* fantasai didn't show her preference IIUC but proposing a rename to
"sideways-lr".

> I think I would like to investigate the backwards-compat impact
> of switching to 'text-orientation: sideways-rl' and dropping
> the other keywords, since that would be a little easier to type,
> but also clearer and more consistent with the corresponding
> writing-mode' keywords... what is your opinion on that, if it
> is feasible?

I disagree. 'writing-mode' is about direction, so "l-to-r" and "r-to-l"
makes sense. 'text-orientation' is about orientation, so "right" makes
sense.

/koji