IDPF Adoption Readiness Roadmap for Previews
Version 2015-07-08
3. Support in EPUB Conformance Test Suite (epubtest.org)
6. Primer/best practice documentation
7. Backwards compatibility assessment
8. Fallback feasibility assessment
9a. Polyfillability assessment
9b. Browser compatibility assessment
10. Accessibility implications assessment
A support request for previews has been opened in the epubcheck issue tracker. It is expected that support will be implemented by the release of EpubCheck 4.0 (release during summer 2015).
Initial support for previews will consist of the following two tests:
Work on building these tests and integrating them into the BISG support grid will be done in coordination with the BISG support grid working group.
Support for authoring previews does not exist at this time, but Feedbooks has created an EPUB Preview Factory tool that creates a standalone publication from an embedded preview collection.
Any reading system can render a standalone preview, as they are EPUB 3 Publications.
No separate primer/best practice documents are planned at this time.
Standalone previews will be readable in legacy EPUB 2 reading systems with the same limitations of any EPUB 3.0.1 publication.
Embedded previews will not be recognized because the collection element did not exist, so therefore will not be available. Otherwise, they present no new issues.
Standalone previews will be readable in exactly the same manner as any EPUB 3.0.1 publication.
Embedded previews will not be recognized because the collection element did not exist, so therefore will not be available. Otherwise, they present no issues.
Standalone previews will be readable in exactly the same manner as any EPUB 3.0.1 publication.
If embedded previews are not recognized, they will simply not be available, as unknown collections are ignored by 3.0.1 reading systems.
Not applicable to previews, as previews are EPUB 3 Publications not a content-level feature. Standalone previews are readable in the same manner as any other publication, and embedded previews simply aren't available if the preview collection is not recognized by the reading system.
Not applicable to previews as they do not introduce any new content-level features.
A reading system must be capable of extracting and presenting only the portions of an publication identified in an embedded preview collection, but implementing this functionality does not require changes to the underlying browser cores themselves.
As EPUB 3 Publications, all accessibility features of the format are available to authors.