EPUB is an interchange and delivery format for digital publications The complete EPUB specification is also available for download as an EPUB This document has been reviewed by the IDPF membership and is. EPUB is a defunct version of the EPUB standard. No work is being undertaken to support this version due to incompatibility with earlier releases of EPUB 3. Submit an EPUB document for validation. Your file must This site uses EPUBCheck to provide validation information for EPUB 2 and 3 documents. If you are.
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EPUB is a maintenance release of EPUB 2. Its development was chartered in , and the final standard was approved by the IDPF Membership as a. EPUB 3 was developed pursuant to a charter approved by the IDPF Membership in May, EPUB was approved by the IDPF membership as a final. On January 30, the combination of IDPF and W3C was completed (W3C IDPF recently requested that all organizations that have contributed to EPUB.
Community Groups are proposed and run by the community. Although W3C hosts these conversations, the groups do not necessarily represent the views of the W3C Membership or staff. Chairs, when logged in, may publish draft and final reports. Please see report requirements. Publish Reports. Note that the specification is nearly finished, and we are encouraging feedback from the community.
EPUB 3. If you have any questions, please contact the group on their public list: In order to join the group , you will need a W3C account. This is a community initiative. This group was originally proposed on by Ralph Swick.
The following people supported its creation: The group must now choose a chair. Read more about how to get started in a new group and good practice for running a group. If you believe that there is an issue with this group that requires the attention of the W3C staff, please email us at site-comments w3.
Following the title first page, this sample also contains two spine items that are styled using CSS multi-column layout. If your reading system supports multi-column layout, then the pages will be rendered in two columns. Strategies for creating EPUB 3 content that can be read by people with different preferred reading modalities.
EPUB 3. This sample section from Children's Literature includes span-element headings in the navigation document toc and also includes the table of contents in the spine with styling and hidden page list.
See the Navigation Document toc. A bindings -based "object rotator".
This particular sample represents an image gallery with caption fields. This sample also includes a page-list nav. Japanese manga. Each page is represented by an HTML document having a single image and nothing else. This sample contains one instance of the epub: Like the base version , but the index is split across three content documents. This EPUB publication has features as below: Like the base version , but includes an embedded declaration for a preview.
Table of Contents
Key among these resources is the container. The container format is defined in [ OCF 3. The structure and containment of an EPUB Publication is only one half of the format, the other half being the content that gets presented to users.
This content is built on the Open Web Platform and comes in two flavours: Called EPUB Content Documents , these documents typically reference many additional resources required for their proper rendering, such as images, audio and video clips, scripts and style sheets. The result is the ability to create a read-aloud experience where text is highlighted as it is narrated.
Media Overlay Documents are defined in [ Media Overlays 3. Additional information about the primary features and functionality that EPUB Publications provide to enhance the reading experience is available from the referenced specifications, and a more general introduction to the features of EPUB 3. It must support all Core Media Type Resources.
It may support an arbitrary set of Foreign Resource types, and must process fallbacks for unsupported Foreign Resources as defined in Foreign Resources if not.
It is recommended that Reading Systems support at least one of the [ H. Authors and Reading System developers need to take into consideration factors such as breadth of adoption, video playback quality, and technology usage royalty requirements when making a choice to include or implement video in either format, or both.
EPUB Publications with older version numbers will not always render exactly as intended unless processed according to their respective specifications. It must be a conformant non-validating processor [ XML ]. It must be a conformant application as defined by [ XML Base ].
A conforming Reading System is not necessarily a single dedicated program or device, but might exist as a distributed system. These resources are divided into two categories: Authors are free to use both types of resources to construct their EPUB Publications, but need to be aware that some Reading Systems might not render the Foreign Resources they use.
As EPUB Publications are designed to be fully consumable on any compliant Reading System, a system of fallbacks is therefore necessary to ensure that the use of Foreign Resources does not impact on the ability of the user to consume the content.
This section lays out the set of Core Media Types that are supported across Reading Systems and identifies fallback mechanisms that can be used to satisfy the consumability requirement.
Foreign Resources may be included in an EPUB Publication without a fallback provided they are not referenced from spine itemref elements [ Packages 3. Fallbacks take one of the two following forms:. They are used to create fallbacks for Foreign Resources in the spine [ Packages 3.
Authors are encouraged to locate audio, video and script resources inside the EPUB Container whenever feasible to allow users access to the entire presentation regardless of connectivity status. It must be a conformant XML 1. External identifiers must not appear in the document type declaration [ XML ].
It must not make use of XInclude [ XInclude ]. Features defined in this specification and its siblings are occasionally removed if they are no longer needed or have been replaced by another feature. Prior to removal, the features are marked as deprecated or superseded as an early warning to the EPUB community. A deprecated feature is one that is in the process of being removed from the current version of the specification, while a superseded feature is one that is being retained only for authoring content compatible with an older version.
If a feature is marked as deprecated , the following hold true:. The feature will be removed in a future version of the specification. Reading Systems must continue to support the feature as it is defined until it is formally removed.
Validation tools must alert Authors that inclusion of the feature is deprecated when encountered in an EPUB Publication. It is recommended that the alert be lower in severity than an error or warning.
EPUB 3 Samples Project
If a feature is marked as superseded , the following hold true:. The superseded feature may be removed in a future version of the specification, but there is no definite timeline for removal. Authors may include the superseded feature for compatibility with older versions of the specification. Reading Systems must not support the superseded feature in content that conforms to the current version of the specification. Validation tools must not alert Authors about the presence of the superseded feature in an EPUB Publication, as it is valid for backwards compatibility.
Validation tools must alert Authors if the superseded feature is not conformant to its definition or otherwise breaks a usage requirement. A feature that is superseded and marked for removal differs from a superseded feature in the following ways:.
Validation tools must alert Authors about the presence of superseded features that are marked for removal.
It is recommended that the alert be given the same severity as deprecated features. This index identifies where key concepts are defined in EPUB 3. CSS style sheets [ Content Docs 3. CSS snapshot support.