[webvtt] Isolate bidi for ruby text?

zcorpan has just created a new issue for 
https://github.com/w3c/webvtt:

== Isolate bidi for ruby text? ==
Should the text in `<rb>` be isolated for the purposes of bidi? It 
seems to me that it should be possible to use e.g. English ruby text 
for Arabic ruby base.

    <ruby>مرحبا!<rt>Hello!</ruby>

I think setting 'unicode-bidi' to "plaintext" for `<rt>` would fix 
this.

CC @r12a 


See https://github.com/w3c/webvtt/issues/236

Received on Thursday, 5 November 2015 11:07:48 UTC