I have also seen , in some retail books, the main body text size set to 1.1em and then lots of 0.9090...in para styles to counteract it.
And, less commonly, a base size of 1.2em....
To the extent that I can be bothered, I tweak everyting that is >1, back to 1. I am not a fan of big headers on small screens, also I find anything smaller than 0.9 to be hard to read. Some books put some sections in a smaller font, to make them stand out from the main story line I suppose. Which probably works for the print hardback edition but is a fail when carried over into the e book edition
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