Looking a bit more at all the "do not use this attribute" messages on that mozilla page, it looks like they're basically saying if it can be done in css, do it there instead of in the <body> tag. And that's pretty much why I clear the <body> tag on all the books I mess with. Of course, all I usually see there is an id= tag (I don't really understand the point of that) and a calibre tag of some sort (where, I think, it's trying to reproduce what the publisher was trying to do globally).
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