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Mark the rtl dir value under-implemented by mattgarrish · Pull Request #2515 · w3c/epub-specs · GitHub
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@mattgarrish mattgarrish commented Jan 6, 2023

As discussed on the 2023-01-05 telecon, there are support gaps for the dir attribute in the package document. Looking at the tests, these failures appear to all be centred around support for the rtl value.

Consequently, rather than mark the whole attribute under-implemented, this PR only adds the label to the rtl value. This is in keeping with how the portrait value for rendition:spread is deprecated.

If I've misread the test results and we need to consider a whole-attribute labelling, please feel free to say so, though.

And as this looks like it could be the only under-implemented feature we'll have, and we want reading systems to support it moving forward, it doesn't make sense to me to label it in the Reading Systems specification. It seems to undermine the goal of getting support improved. Can we limit ourselves only to warning authors? And, similarly, can we remove the text in the RS appendix about not having to support under-implemented features?


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@OriKuttner
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Where in the package document there is a dir="rtl"?

@mattgarrish
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The root element and all elements that accept text allow dir. See the diff.

…ote explaining why it is still important to set;

adds note to the RS spec to explain that reading systems need to support the attribute despite the authoring label
…o fix/dir-label

# Conflicts:
#	epub33/core/index.html
#	epub33/rs/index.html
Comment on lines +2703 to +2704
<li>11-Jan-2023: Removed support description for under-implemented features. See <a
href="https://github.com/w3c/epub-specs/pull/2515">pull request 2515</a>.</li>
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I guess this is based on getting to an equilibrium point on MO, ie, that there is no under-implemented notion for MO at all (which is probably all right, because MO is not a required feature as a whole).

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Either that or we do something similar where we under-implement the authoring feature. I made that change after the last call when it sounded like we wouldn't have to label MO because it's only a recommended feature. It's easy to get back the prose if we need it, though.

@mattgarrish mattgarrish merged commit 99d2e65 into main Jan 12, 2023
@mattgarrish mattgarrish deleted the fix/dir-label branch January 12, 2023 14:38
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5 participants