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Re:Internet Explorer 11 (IE11) to be retired on June 15, 2022 by dragonwriter on Wednesday May 19, 2021 @11:36PM (#27217094)
> Sounds like you’re talking about the subset of HTML+CSS used in ePub.

EPUB3 supports JS.

Re:Internet Explorer 11 (IE11) to be retired on June 15, 2022 by derefr on Wednesday May 19, 2021 @11:55PM (#27217202)
EPUB3 is a half-baked standard that nothing actually fully supports. The JavaScript parts especially—most e-readers don’t ever plan on adding JS support, even if they nominally support EPUB3.