In CSS3 it is called "shapes".
There is also these sites showing off more examples:
http://demosthenes.info/blog/898/Wra...ith-CSS-Shapes
https://www.adobe.com/devnet/html5/a...3-regions.html
And here is a draft of the spec:
http://dev.w3.org/csswg/css-shapes-2/
Quote:
Originally Posted by Jellby
Whether any real reader will support it, I don't know.
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I believe iBooks supports the webkit variant of CSS Shapes... although I am not 100% sure (I don't venture into that space).
I could have sworn I saw example EPUBs on Adobe's site somewhere over the past few years.