Better typesetting for EPUB (and HTML)
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Better typesetting for EPUB (and HTML)

The aim of Calzone is to create a Javascript library which can be dropped into EPUB files to greatly improve the typographic experience of ebook readers. Most current e-reader software does not support lovely typography. In particular, there is little if any support for hyphenation, paragraph-level justification, keep and break controls, and other typographic necessities in a reflowing ebook environment. (See for a full list of gripes.)

But the EPUB standard, in particular EPUB3, grudging allows for readers to support the execution of JavaScript, and many e-reader software already executes inline Javascript in EPUB files. Which means that the programmer already has a lot of control over what gets displayed on the page.

Borrowing (extremely) heavily from and , Calzone fills in the gaps that reader software leaves behind, fiddling with the placement of words and paragraphs on the page to make e-books prettier.

There's nothing particularly EPUB-specific about Calzone, so if you like you can use it to improve the typography of ordinary web pages too. I wouldn't, though.

See for a rigged demo.