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The reference to CSS2 in Second Edition changed from:
> Bert Bos et al., Cascading Style Sheets, Level 2, W3C Recommendation, 12 May 1998. (See http://www.w3.org/TR/1998/REC-CSS2-19980512/.)
to …
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The `ttm:agent` element is defined in metadata.xsd as `xs:string`, but it should be as in [TTML1 §12.1.5](https://www.w3.org/TR/ttml1/#metadata-vocabulary-agent):
``` xml
Content: ttm:name*, ttm:a…
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Currently the schema depends on some external schema such as `xml.xsd` that are not in the repository. I would like to copy them into the repository for ease of reference when using validating XML pro…
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Either fill in CT708 mapping information in Appendix T or remove this appendix.
Editorial note from 2014-03-06.
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10.2.38 tts:rubyOverhangClass
https://www.w3.org/TR/2016/WD-ttml2-20161117/#style-attribute-rubyOverhangClass
> If the language of the base text is specified or can be inferred as Chinese or Korea…
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As presently defined, we allow the alpha value in an rgba() tuple to take a value from 0 to 255, rather than 0.0 to 1.0 (or 0% to 100%) as defined in CSS3 Color. On the other hand, we do use the CSS3 …
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TTML specifies:
* _The tts:padding attribute is used to specify padding (or inset) space on all sides of a region area._
* _The tts:origin attribute is used to specify the x and y coordinates of t…
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As follow-up of the discussion in https://github.com/w3c/ttml1/issues/221, the padding tests have to be revised in order to reflect that the [TTML padding](https://www.w3.org/TR/ttaf1-dfxp/#style-attr…
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The [construct intermediate document] process "prune[s] elements if they are not a content element". This prunes `set` elements, which cannot be used for the "10.4.4.4 Style Resolution Process".
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If a two value percentage based `tts:fontSize` is used and an ancestor element specifies a single value absolute size, the horizontal component is undefined. For example:
``` xml
...
```
In thi…