[1eduard]

Originally Posted by theducks

Remember EPUB is a subset of HTML / CSS
Not all things that work on Web Pages can be used in EPUB
.
Not all Devices behave the same (for a given code)


MR has a wonderful Wiki How To
https://wiki.mobileread.com/wiki/Category:HowTo

So, you've to learn HTML5, SVG, and CSS to know EPUB?