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Originally Posted by KevinH
Please show me where in the epub3.3 spec this "feature" is described or supported?
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https://www.w3.org/TR/epub/#sec-media-overlays
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What reading systems support this "feature"?
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All of them? Apple Books, Adobe Digital Editions, Thorium, Colibrio... Those are the ones I test on, but I'm guessing any current EPUB reader. Apple Books and Colibrio only support it with fixed-layout, though, not reflowable. Readium supports it, too.
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What namespace is "media:" from in the opf?
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I'm not sure how to answer this, but this is what InDesign puts in a reflowable:
xmlns="http://www.w3.org/1999/xhtml
and in a fixed-layout:
xmlns="http://www.idpf.org/2007/opf
Read-aloud EPUBs have been a huge part of my ebook conversion work for years, so from my perspective, it's nothing odd.