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Newly deprecated features in epub 3.4 #1649

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spec: EPUB 3.4status: has PR

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Features that are now deprecated and should generate warnings:

rendition:align-x-center
the use of the reserved prefixes xsd, msv, and prism

mattgarrish
added
spec: EPUB 3.4Impacting the support of EPUB 3.4
on Jan 2, 2026
rdeltour
self-assigned this
on Feb 5, 2026
rdeltour
added
status: ready for implemThe issue is ready to be implemented
on Feb 5, 2026
rdeltour
added this to the EPUB 3.4 milestone on Feb 5, 2026
rdeltour
added
status: has PRThe issue is being processed in a pull request
and removed
status: ready for implemThe issue is ready to be implemented
on Sep 14, 2026
rdeltour
added a commit that references this issue on Sep 14, 2026
feat(EPUB 3.4): deprecate `rendition:align-x-center`
94d76ff
rdeltour
closed this as completedin #1686 on Sep 14, 2026
rdeltour
added a commit that references this issue on Sep 14, 2026
feat(EPUB 3.4): deprecate `xsd`, `msv`, and `prism` reserved prefixes
dd7ad1a

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