[Bug 19632] [WebVTT] cue identifier string clarification

https://www.w3.org/Bugs/Public/show_bug.cgi?id=19632

Silvia Pfeiffer <silviapfeiffer1@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|WORKSFORME                  |---

--- Comment #4 from Silvia Pfeiffer <silviapfeiffer1@gmail.com> ---
This falls in between WebVTT and CSS.

Since the WebVTT spec has a CSS extension section where it says how to apply
::cue(selector), and there is nothing about ::cue in the CSS spec, it seems
that the WebVTT spec is the only place where this could be explained

The "selector" in ::cue(selector) is expected to be a conformant CSS selector,
so we should add a sentence referencing CSS escaped characters:

E.g. add after:

"For the purposes of ID selector matching, Lists of WebVTT Node Objects have
the ID given by the cue's text track cue identifier, if any."

Something like:

"If necessary, CSS escaped characters [1] are used to make the cue identifier a
valid CSS selector."

[1] http://www.w3.org/TR/CSS21/syndata.html#escaped-characters

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