[ttml2] Clarify "the first font obtained" in tts:lineHeight normal algorithm. (#1241)

skynavga has just created a new issue for https://github.com/w3c/ttml2:

== Clarify "the first font obtained" in tts:lineHeight normal algorithm. ==
Clarify the following ambiguity regarding the `tts:lineHeight="normal"` algorithm in [ยง10.2.27](https://www.w3.org/TR/2021/CR-ttml2-20210309/#style-attribute-lineHeight):

- [ ] no contextual context is specified by which means `tts:fontSelectionStrategy` could function as a mapping constraint

If possible, the resolution of this ambiguity should favor the CSS Fonts Module definition of [first available font](https://www.w3.org/TR/css-fonts-3/#character-map), in which case the use of `tts:fontSelectionStrategy` as a mapping constrain becomes moot.

Note that this ambiguity is present regardless of whether `tts:lineHeight` is applied to `p` or `span`.

Please view or discuss this issue at https://github.com/w3c/ttml2/issues/1241 using your GitHub account


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Received on Thursday, 5 August 2021 00:45:10 UTC