The Future of EPUBIDPF Digital Book 2011 at BEA

May 24, 2011

Garth ConboyEngineering Manager, Google Books

Vice-Chair, EPUB Working Group

Rich(er) Layout

• EPUB 3 adds lots– CSS 2.1

• Media Queries (@media, @import)• display: inline-block, position:, z-index:• overflow:, clip:, visibility:• content:, quotes:, visibility:• letter-spacing:, word-spacing:, text-transform:• border-collapse:, border-spacing:, empty-cells:• Enhanced aural stylesheets

– CSS Text Level 3• -epub-hyphens:, -epub-line-break:, -epub-text-align-last:• -epub-emphasis:, -epub-word-break:

Rich(er) Layout

• EPUB 3 adds lots– CSS Writing Modes Module Level 3

• -epub-writing-direction:, -epub-text-orientation:, -epub-text-combine:– CSS3 Multi Column

• column-width:, column-count:, column-gap:, column-rule:• break-before:, break-after:, break-inside:• column-fill:

– CSS3 Media Queries– -epub-ruby-position:– CSS Font Level 3 @font-face

• font-family, font-style, font-weight• src• unicode-range• Both OpenType and WOFF fonts• Font Obsfucation

Rich(er) Layout

Support for attractively reflowing content to different formats, for example from 3 to 2 columns…

Rich(er) Layout

Support for multilingual and multi-alphabet layout beyond traditional Latin-based alphabet

Rich(er) Layout JavaScript islands Active content areas

Rich(er) Layout

JavaScript islands Click-through or timed

slideshows

Rich(er) Layout CSS media-queries to support

multiple display sizes retaining high content fidelity…

EPUB 3 Linking Scheme Registry• EPUB CFI: First Scheme, Part of EPUB 3• EPUB CFI design considerations:

– Document references to EPUB content should be enabled in the same way that existing hyperlinks enable references throughout the Web.

– The mechanism used to reference content should be interoperable: references to a reading position created by one Reading System should be usable by another.

– Each location in an EPUB file should be able to be identified without the need to modify the document.

– Comparison operations, including tests for sorting and comparison, should be able to be performed without accessing the referenced files.

– Identifier resolution should be reasonably efficient (e.g., processing of the first chapter is not required to resolve a fragment identifier that points to the last chapter).

– References should be able to recover their target locations through parser variations and document revisions.

– Expression of simple ranges should be supported.

EPUB 3 Linking Scheme Registry• EPUB CFI Examples:

– book.epub#epubcfi(/6/4[chap01ref]!/4[body01]/14/10[para05]/3:10[abc,xyz])

– <a href="pub.opf#epubcfi(/6/4[chap01ref]!/4[body01]/14/10[para05]/2/1:3[;s=b])">location</a>

• EPUB Linking Going Forward– Reading position– Annotations & highlights– Additional schemes