Thanks for the input about h1-h5 and limitations of some ereaders. I was not aware that so many of them were so limited. The ebook I'm doing is actually four levels deep and is written in no-kidding outline form so h1-h4 looks real good on the TOC which is collapsible. I threw in h5 as image captions. In the past I've set images with non-drifting top, bottom, and top-and-bottom, and right-side captions using css. To my horror, years ago, I found out that even Amazon does not support but about half of what is available. It will not even do columns. Now there is the very desirable container queries on the horizon and, though I am hopeful, I'll bet this will not be included. The only ereader out there which works at the 100% level is calibre's own built-in reader. Best regards, Pop
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