I was googling around, and came upon these tables of ebook-format/platform comparisons at atavist.com (an online publishing platform).
CSS Support:
http://help.atavist.com/ebook:css
HTML Support:
http://help.atavist.com/ebook:html
I am not sure how current the information is (no dates displayed on their pages), but the site blog has articles posted in 2015 and 2016.
Possibly useful?
A very interesting point:
Quote:
Adobe Digital Editions (affects Bluefire Reader and ADE apps)
◾ ADE will remove all custom styles if your CSS file has any validation errors
◾ ADE will remove all custom styles if your CSS file has any media queries in it. We’ve filed this as a bug with Adobe but don’t know of a fix date.
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