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Accessible EPUB 3, Strategies for creating EPUB 3 content that can be read by people See the Navigation Document (wm-greece.info) for details. The EPUB 3 Samples Project provides a collection of EPUB 3 publications intended to showcase features of the specification and to provide testing materials for. EPUB 3 deprecates the NCX and replaces it with the EPUB Navigational Document (END). Listing 2 shows an example. The END uses.
Also supports both obfuscated and regular font resources to accommodate font licensing restrictions for many commercially-available fonts. For audio. Allows Media Overlay Documents pre-recorded narration synchronized with the text of a Content Document. Accessibility A major goal of EPUB3 is to facilitate content accessibility with a variety of features Navigation: END provides a mechanism to include a human- and machine-readable global navigation layer in the Publication nav element , thereby ensuring increased usability and accessibility Semantic Markup: support for a number of HTML5 elements intended to make markup more semantically meaningful e.
It also introduces the epub:type attribute, which is meant to be functionally equivalent to the W3C Role Attribute. This attribute allows any element in an XHTML Content Document to include additional information about its purpose and meaning within the work, using controlled vocabularies and terms. Dynamic Layouts: dynamic layout content is intended to be formatted on the fly rather than being typeset in a paginated manner in advance i.
Aural Renditions of content text-to-speech. Media Overlays provide the ability to synchronize the text and audio content. Both are important for accessibility. Draw the curtains, turn off the lights, set the background black and go full screen. Show them how to use the NEXT button. Antonio's tale is standard landscape-locked fixed layout in aspect ratio.
It uses advanced multi-layer CSS and user-mixed audio. The audio will work on all ePub3 devices but SFx mixing is not be available on devices where only one track can be played at a time. Famous paintings is a small but beautiful demonstration fixed layout book. It's purpose is to demonstrate how ePub3 fixed layout image-centric books can be designed to deliver new content engagement experiences.
It uses fixed layout to break paper metaphors with digital content reading.
It will work on all ePub3 readers but because it uses asymmetrical page layout and spine linear properties will not display as intended on reading systems with a partial or inflexible implementation of the fixed layout specification.
It uses spine properties and page dimensions aggressively. It demonstrates what can and should be done with fixed layout content. This is a designer-centric book to show what is possible in terms of page layout and interactive navigation.
Download the examples used in this article. Prerequisites The sample code and examples in this article assume a basic familiarity with the EPUB 2 specification and XML-based publications in general.
However, publishers and authors found that EPUB 2 couldn't handle many content types and use cases, such as multimedia books, books with complex layout, mathematical publications, and interactive documents. Support for embedded fonts is now required of reading systems that have a CSS viewport. Web Open Font Format was added as an acceptable font format.
The NCX is still allowed for backwards compatibility. A developer preview version is available for use with EPUB 3 documents and is used throughout this article. See Related topics for links to the latest version.
It is strongly suggested that you use the. XML processing mode is required when working with many of the features demonstrated in this article, such as CSS namespaces.
Typically, you interact with EpubCheck through the command line, as shown below. If you get the error java. This extremely useful feature, which is used in the examples in this article, can: Help isolate problems.
Be incorporated in a unit testing framework for a toolchain that outputs a single file type. Listing 1. Only a subset of the available tests is run! No errors or warnings detected. Reliance on the well-specified DAISY format was meant to ease development of eBook readers that could support rich accessibility.
In that sense, the NCX performed capably. Confusion over which parts of the NCX were required in EPUB resulted in undesirable fragmentation and proprietary extensions by some eBook retailers and reading system vendors. Listing 2 shows an example.
Listing 2. Listing 3. The END eliminates this duplication and allows a great deal of flexibility in presenting some or all of the TOC in the content flow.
Listing 4. You do so using the HTML5 hidden attribute, as in Listing 5 , on any elements that should be removed from presentation to users. Listing 5. Removing subsections from the visual presentation of a TOC You might wonder why you couldn't do this using the CSS display: none property.
Because EPUB is used in a variety of reading systems, including nonvisual screen readers or Braille devices, not all readers are required to support CSS.
Most modern web browsers support hidden natively. It's a good idea to include CSS to explicitly set the display property of these elements, as in Listing 6.
Listing 6. Figure 1.