Collapse language for style application to paragraph text nodes; add …

[skynavga]

…anonymous span term (#533).

Closes #533.

[cconcolato]

Built version here https://rawgit.com/w3c/ttml2/3b30856c6e90ae772401b8e14fa8abe1647b7f40/index.html

[cconcolato]

This seems obvious to me.

[skynavga]

I added this because someone (perhaps you) had suggested that we add anonymous span to the Applies to entries for each property that listed span. I did not wish to add this in all those locations, so determined that a blanket statement in the prologue would serve the same purpose. Just consider the purpose of this text to be for avoidance of doubt, which we use elsewhere as well.

[nigelmegitt]

I think this is a helpful line to add to the spec, but I would prefer to explicitly state that character children of p elements are considered to be enclosed in those anonymous spans. Perhaps reword to:

For the purpose of determining the applicability of a style property, if the style property is defined 
so as to apply to a <loc href="#content-vocabulary-span"><el>span</el></loc> element, then it also 
applies to the <loc href="#terms-anonymous-span">anonymous span</loc> elements that enclose 
any character content children of <loc href="#content-vocabulary-"><el>p</el></loc> elements.

In a way this could be seen as duplication of the definition of anonymous span, but I think it would be helpful for ease of reading and for continuity when comparing against the removed sentences. In other words, it makes it easier to argue that this is an editorial change.

[cconcolato]

Besides the last sentence of section 10 which seems obvious to me and not necessarily, I'm fine with this PR.

[nigelmegitt]

Requesting a small but I think worthwhile editorial change.

[nigelmegitt]

I think this is a helpful line to add to the spec, but I would prefer to explicitly state that character children of p elements are considered to be enclosed in those anonymous spans. Perhaps reword to:

For the purpose of determining the applicability of a style property, if the style property is defined 
so as to apply to a <loc href="#content-vocabulary-span"><el>span</el></loc> element, then it also 
applies to the <loc href="#terms-anonymous-span">anonymous span</loc> elements that enclose 
any character content children of <loc href="#content-vocabulary-"><el>p</el></loc> elements.

In a way this could be seen as duplication of the definition of anonymous span, but I think it would be helpful for ease of reading and for continuity when comparing against the removed sentences. In other words, it makes it easier to argue that this is an editorial change.

[skynavga]

@nigelmegitt the language you suggest would be redundant or possibly read as contradicting the statement found in 8.1.5:

If a sequence of children of a p element consists solely of character information items, then that sequence must be considered to be an anonymous span for the purpose of applying style properties that apply to span elements.

[css-meeting-bot]

The Working Group just discussed Collapse language for style application to paragraph text nodes; add … ttml2#803, and agreed to the following:

• SUMMARY: Duplicate anonymous span text from p element into span element (for @skynavga) and reference the [create anonymous span] procedure from both.

The full IRC log of that discussion

<nigel> Topic: Collapse language for style application to paragraph text nodes; add … ttml2#803
<nigel> github: https://github.com//pull/803
<nigel> Glenn: I added a comment to this.
<nigel> Cyril: Can we add a link from the sentence in 8.1.5 to the process for creating anonymous spans?
<nigel> Glenn: Yes, and come to think of it we should add the same text to the span element to
<nigel> .. make it complete. Right now it is incomplete.
<nigel> Cyril: I don't want it to look like there's a separate procedure.
<nigel> Glenn: That gives me a tbd on this before you sign off on it Nigel
<nigel> Nigel: OK
<nigel> .. Should we add a note pointing the reader to anonymous spans beneath the new text?
<nigel> Glenn: I don't want another place where we paraphrase what the construct anonymous span
<nigel> .. procedure does.
<nigel> Nigel: I was thinking of a note with a reference, but I take your point.
<nigel> Glenn: The terms anonymous span and span already take you to the right definitions.
<nigel> Nigel: Yes, if you add that anonymous span text from p to span then yes, I'm okay with that.
<nigel> SUMMARY: Duplicate anonymous span text from p element into span element (for @skynavga) and reference the [create anonymous span] procedure from both.

[skynavga]

@nigelmegitt addressed actions from SUMMARY above; should be good to go