Quote:
Originally Posted by pedz
Do you happen to have an example of an epub book where on some reader, some part is viewed as a pop up?
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I don't think any reader system implements a multi-window environment for epubs. The references to footnotes were just talk. ePub's only linking mechanism is the simple anchor tag and href attribute, so there's nothing built-in to allow it to display certain links in a different way, and there's no support for embedded scripts.
It would certainly be possible to bolt on a set of extensions to allow this, but that basically means a rewrite of the specification.