A series of EPUB widgets (http://www.idpf.org/epub/widgets/) for the development of avant-garde ebook content:
Swipe/mouse over the whitespace in the excerpt from Alice’s Adventures in Wonderland to reveal the rest of the story
Click/tap anywhere on a text excerpt of Bartleby, the Scrivener, and see the evidence left behind.
Click/tap the “Randomize content!” button over and over to scramble and re-scramble the lines of a famous passage from Hamlet.
Each subdirectory contains a .epub Widget file, as well as its component HTML/JS.
Also, you can download a full EPUB containing all three avant-garde examples.