ISO/IEC 23736-3:2020
(Main)Information technology — Digital publishing — EPUB 3.0.1 — Part 3: Content documents
Information technology — Digital publishing — EPUB 3.0.1 — Part 3: Content documents
This specification, EPUB Content Documents 3.0.1, defines profiles of HTML5, SVG, and CSS for use in the context of EPUB® Publications. This specification is one of a family of related specifications that compose EPUB 3, the third major revision of an interchange and delivery format for digital publications based on XML and Web Standards. It is meant to be read and understood in concert with the other specifications that make up EPUB 3: The EPUB 3 Overview [EPUB3Overview], which provides an informative overview of EPUB and a roadmap to the rest of the EPUB 3 documents. The Overview should be read first. EPUB Publications 3.0.1 [Publications301], which defines the semantics and overarching conformance requirements for each Rendition of an EPUB Publication. EPUB Open Container Format (OCF) 3.0.1 [OCF301], which defines a file format and processing model for encapsulating a set of related resources into a single-file (ZIP) EPUB Container. EPUB Media Overlays 3.0.1 [MediaOverlays301], which defines a format and a processing model for synchronization of text and audio. This specification supersedes EPUB Content Documents 3.0 [ContentDocs30]. Refer to [EPUB3Changes] for information on differences between this specification and its predecessor.
Technologies de l'information — Publications numériques — EPUB 3.0.1 — Partie 3: Documents de contenu
General Information
Buy Standard
Standards Content (Sample)
INTERNATIONAL ISO/IEC
STANDARD 23736-3
First edition
2020-02
Information technology — Digital
publishing — EPUB 3.0.1 —
Part 3:
Content documents
Technologies de l'information — Publications numériques — EPUB
3.0.1 —
Partie 3: Documents de contenu
Reference number
©
ISO/IEC 2020
© ISO/IEC 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO/IEC 2020 – All rights reserved
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical activity.
ISO and IEC technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and non‐governmental, in liaison with ISO and IEC, also take part in the
work.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of document should be noted (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
Details of any patent rights identified during the development of the document will be in the
Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents) or the IEC
list of patent declarations received (see http://patents.iec.ch).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the World
Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT),
see www.iso.org/iso/foreword.html.
This document was prepared by the World Wide Web Consortium (W3C) (as EPUB Content Documents
3.0.1) and drafted in accordance with its editorial rules. It was adopted, under the JTC 1 PAS
procedure, by Joint Technical Committee ISO/IEC JTC 1, Information technology.
A list of all parts in the ISO/IEC 23736 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
© ISO/IEC 2020 – All rights reserved
iii
EPUB Content Documents 3.0.1
Recommended Specification 26 June 2014
THIS VERSION
http://www.idpf.org/epub/301/spec/epub-contentdocs-20140626.html
LATEST VERSION
http://www.idpf.org/epub3/latest/contentdocs
PREVIOUS VERSION
http://www.idpf.org/epub/301/spec/epub-contentdocs-20140228.html
A diff of changes from the previous version is also available.
Please refer to the errata for this document, which may include some normative corrections.
All rights reserved. This work is protected under Title 17 of the United States Code. Reproduction and
dissemination of this work with changes is prohibited except with the written permission of the International
Digital Publishing Forum (IDPF).
EPUB is a registered trademark of the International Digital Publishing Forum.
Editors
Markus Gylling, International Digital Publishing Forum (IDPF)
William McCoy, International Digital Publishing Forum (IDPF)
Elika J. Etemad, Invited Expert
Matt Garrish, Invited Expert
TABLE OF CONTENTS
1. Overview
1.1. Purpose and Scope
1.2. Relationship to Other Specifications
1.2.1. Relationship to HTML5
1.2.2. Relationship to SVG
1.2.3. Relationship to CSS
1.2.4. Future Maintenance
1.3. Terminology
1.4. Typographic Conventions
1.5. Conformance Statements
1.6. Namespace prefix mappings
2. EPUB Content Documents
2.1. XHTML Content Documents
2.1.1. Content Conformance
2.1.2. Reading System Conformance
2.1.3. HTML5 Extensions
2.1.3.1. Semantic Markup
© ISO/IEC 2020 – All rights reserved 1
2.1.3.1.1. Semantic Inflection
2.1.3.1.1.1. Introduction
2.1.3.1.1.2. The epub:type Attribute
2.1.3.1.1.3. Vocabulary Association
2.1.3.1.1.4. Processing Requirements
2.1.3.1.2. Semantic Enrichment
2.1.3.1.2.1. Introduction
2.1.3.1.2.2. Content Conformance
2.1.3.1.2.3. Processing Requirements
2.1.3.2. SSML Attributes
2.1.3.2.1. Overview
2.1.3.2.2. The ssml:ph attribute
2.1.3.2.3. The ssml:alphabet attribute
2.1.3.3. Content Switching
2.1.3.3.1. Introduction
2.1.3.3.2. Definition
2.1.3.3.2.1. The epub:switch Element
2.1.3.3.2.2. The epub:case Element
2.1.3.3.2.3. The epub:default Element
2.1.3.3.3. Processing
2.1.3.4. The epub:trigger Element
2.1.3.5. Alternate Style Tags
2.1.3.6. Custom Attributes
2.1.3.7. The aria-describedat Attribute
2.1.4. HTML5 Deviations and Constraints
2.1.4.1. Embedded MathML
2.1.4.1.1. Introduction
2.1.4.1.2. Content Conformance
2.1.4.1.3. Reading System Conformance
2.1.4.1.4. Alternative Content
2.1.4.2. Embedded SVG
2.1.4.2.1. Embedded SVG and CSS
2.1.4.3. Unicode Restrictions
2.1.4.4. Discouraged Constructs
2.1.4.5. Special Considerations
2.1.4.5.1. The body element
2.2. EPUB Navigation Documents
2.2.1. Introduction
2.2.2. Content Conformance
2.2.3. Reading System Conformance
2.2.4. EPUB Navigation Document Definition
2.2.4.1. The nav Element: Restrictions
2.2.4.2. The nav Element: Types
2.2.4.2.1. The toc nav Element
2.2.4.2.2. The page-list nav Element
2.2.4.2.3. The landmarks nav Element
2.2.4.2.4. Other nav Elements
2.2.4.3. The hidden attribute
2.3. SVG Content Documents
2.3.1. Introduction
2.3.2. Content Conformance
2.3.3. Restrictions on SVG 1.1
2.3.4. Reading System Conformance
2.3.5. Semantic Inflection
2.4. Scripted Content Documents
2.4.1. Scripting Contexts
2.4.2. Content Conformance
2.4.3. Reading System Conformance
2.4.4. Security Considerations
2.4.5. Event Model Considerations
2.5. Fixed-Layout Documents
2.5.1. Introduction
2.5.2. Reading System Conformance
2 © ISO/IEC 2020 – All rights reserved
2.5.3. Viewport Rendering
2.5.4. Content Dimensions for XHTML and SVG
2.5.4.1. Expressing ICB Dimensions in XHTML
2.5.4.2. Expressing ICB Dimensions in SVG
3. EPUB Style Sheets
3.1. Content Conformance
3.2. Reading System Conformance
3.3. EPUB 3 CSS Profile
3.3.1. CSS 2.1
3.3.2. CSS 2.0
3.3.3. CSS 3.0 Speech
3.3.4. CSS Fonts Level 3
3.3.5. CSS Text Level 3
3.3.6. CSS Text Decoration Level 3
3.3.7. CSS Writing Modes
3.3.8. Selectors
3.3.9. Media Queries
3.3.10. CSS Namespaces
3.3.11. CSS Multi-Column Layout
3.3.12. Ruby Positioning
3.3.13. Display Property Values oeb-page-head and oeb-page-foot [DEPRECATED]
4. PLS Documents
4.1. Overview
4.2. EPUB Publication Conformance
4.3. Content Conformance
4.4. Reading System Conformance
A. JavaScript epubReadingSystem Object
A.1. Syntax
A.2. Description
A.3. Properties
A.4. Methods
A.4.1. hasFeature
A.4.1.1. Syntax
A.4.1.2. Description
A.4.1.3. Features
B. -epub-fullsize-kana Character Mapping Reference
C. Acknowledgements and Contributors
References
› 1 Overview
› 1.1 Purpose and Scope
This section is informative
This specification, EPUB Content Documents 3.0.1, defines profiles of HTML5, SVG, and CSS for
use in the context of EPUB® Publications.
This specification is one of a family of related specifications that compose EPUB 3, the third major
revision of an interchange and delivery format for digital publications based on XML and Web
Standards. It is meant to be read and understood in concert with the other specifications that make up
EPUB 3:
© ISO/IEC 2020 – All rights reserved 3
The EPUB 3 Overview [EPUB3Overview], which provides an informative overview of EPUB and
a roadmap to the rest of the EPUB 3 documents. The Overview should be read first.
EPUB Publications 3.0.1 [Publications301], which defines the semantics and overarching
conformance requirements for each Rendition of an EPUB Publication.
EPUB Open Container Format (OCF) 3.0.1 [OCF301], which defines a file format and
processing model for encapsulating a set of related resources into a single-file (ZIP) EPUB
Container.
EPUB Media Overlays 3.0.1 [MediaOverlays301], which defines a format and a processing
model for synchronization of text and audio.
This specification supersedes EPUB Content Documents 3.0 [ContentDocs30]. Refer to
[EPUB3Changes] for information on differences between this specification and its predecessor.
› 1.2 Relationship to Other Specifications
This section is informative
› 1.2.1 Relationship to HTML5
The XHTML document type defined by this specification is based on W3C [HTML5], and inherits all
definitions of semantics, structure and processing behaviors from the HTML5 specification unless
otherwise specified.
In addition, this specification defines a set of extensions to the W3C HTML5 document model that
Authors may include in XHTML Content Documents.
This specification defines a simplified processing model that does not require Reading Systems to
support scripting, HTML5 forms or the HTML5 DOM. EPUB Reading Systems conformant with this
specification are only required to be able to process a conforming EPUB Content Document. As
support for scripting and HTML5 forms are optional Reading System features, a conformant Reading
System might not be a fully-conformant HTML5 User Agent (i.e., it might not implement the complete
HTML5 processing model).
› 1.2.2 Relationship to SVG
This specification defines a restricted subset of SVG 1.1 to represent vector graphics inline in XHTML
Content Documents and as standalone SVG Content Documents.
› 1.2.3 Relationship to CSS
The CSS profile defined in this specification has CSS 2.1 [CSS2.1] as its baseline. Any CSS Style
Sheet that conforms to CSS 2.1 may be used in the context of an EPUB Publication, except as noted
in CSS 2.1.
This specification also incorporates features defined by CSS3 Modules and introduces EPUB-specific
CSS constructs.
4 © ISO/IEC 2020 – All rights reserved
› 1.2.4 Future Maintenance
This specification references W3C specifications that are not yet final, and incompatible changes to
them may occur in the future that would cause EPUB 3 Content Documents that were previously
conformant to no longer be conformant to the latest versions of the referenced specifications.
The IDPF anticipates revising this specification if and when such incompatible changes occur,
updating the normative constraints defined herein as necessary.
› 1.3 Terminology
EPUB Publication
A collection of one or more Renditions conforming to this specification and its sibling
specifications , packaged in an EPUB Container.
An EPUB Publication typically represents a single intellectual or artistic work, but this
specification and its sibling specifications do not circumscribe the nature of the content.
Rendition
A logical document entity consisting of a set of interrelated resources representing one
rendering of an EPUB Publication.
Publication Resource
A resource that contains content or instructions that contribute to the logic and rendering of
at least one Rendition of an EPUB Publication. In the absence of this resource, the EPUB
Publication might not render as intended by the Author. Examples of Publication Resources
include a Rendition's Package Document, EPUB Content Document, EPUB Style Sheets,
audio, video, images, embedded fonts and scripts.
With the exception of the Package Document itself, the Publication Resources required to
render a Rendition are listed in that Rendition's manifest [Publications301] and bundled in
the EPUB Container file (unless specified otherwise in Publication Resource Locations
[Publications301] ).
Examples of resources that are not Publication Resources include those identified by the
Package Document link [Publications301] element and those identified in outbound
hyperlinks that resolve outside the EPUB Container (e.g., referenced from an [HTML5] a
element href attribute).
Core Media Type Resource
A Publication Resource that is a Core Media Type and may therefore be included in the
EPUB Publication without the provision of fallbacks [Publications301] .
EPUB Content Document
A Publication Resource that conforms to one of the EPUB Content Document definitions
(XHTML or SVG).
An EPUB Content Document is a Core Media Type, and may therefore be included in the
EPUB Publication without the provision of fallbacks [Publications301] .
XHTML Content Document
© ISO/IEC 2020 – All rights reserved 5
An EPUB Content Document conforming to the profile of [HTML5] defined in XHTML
Content Documents.
XHTML Content Documents use the XHTML syntax of [HTML5].
SVG Content Document
An EPUB Content Document conforming to the constraints expressed in SVG Content
Documents.
EPUB Navigation Document
A specialization of the XHTML Content Document, containing human- and machine-
readable global navigation information, conforming to the constraints expressed in EPUB
Navigation Documents.
Scripted Content Document
An EPUB Content Document that includes scripting or an XHTML Content Document that
contains HTML5 forms elements.
Refer to Scripted Content Documents for more information.
Top-level Content Document
An EPUB Content Document referenced from the spine, whether directly or via a fallback
chain [Publications301] .
Fixed-Layout Document
An EPUB Content Document directly referenced from the spine that has been designated
pre-paginated in the Package Document, as defined in The rendition:layout Pr
...
INTERNATIONAL ISO/IEC
STANDARD 23736-3
First edition
2020-02
Information technology — Digital
publishing — EPUB 3.0.1 —
Part 3:
Content documents
Technologies de l'information — Publications numériques — EPUB
3.0.1 —
Partie 3: Documents de contenu
Reference number
©
ISO/IEC 2020
© ISO/IEC 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO/IEC 2020 – All rights reserved
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical activity.
ISO and IEC technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and non‐governmental, in liaison with ISO and IEC, also take part in the
work.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of document should be noted (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
Details of any patent rights identified during the development of the document will be in the
Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents) or the IEC
list of patent declarations received (see http://patents.iec.ch).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the World
Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT),
see www.iso.org/iso/foreword.html.
This document was prepared by the World Wide Web Consortium (W3C) (as EPUB Content Documents
3.0.1) and drafted in accordance with its editorial rules. It was adopted, under the JTC 1 PAS
procedure, by Joint Technical Committee ISO/IEC JTC 1, Information technology.
A list of all parts in the ISO/IEC 23736 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
© ISO/IEC 2020 – All rights reserved
iii
EPUB Content Documents 3.0.1
Recommended Specification 26 June 2014
THIS VERSION
http://www.idpf.org/epub/301/spec/epub-contentdocs-20140626.html
LATEST VERSION
http://www.idpf.org/epub3/latest/contentdocs
PREVIOUS VERSION
http://www.idpf.org/epub/301/spec/epub-contentdocs-20140228.html
A diff of changes from the previous version is also available.
Please refer to the errata for this document, which may include some normative corrections.
All rights reserved. This work is protected under Title 17 of the United States Code. Reproduction and
dissemination of this work with changes is prohibited except with the written permission of the International
Digital Publishing Forum (IDPF).
EPUB is a registered trademark of the International Digital Publishing Forum.
Editors
Markus Gylling, International Digital Publishing Forum (IDPF)
William McCoy, International Digital Publishing Forum (IDPF)
Elika J. Etemad, Invited Expert
Matt Garrish, Invited Expert
TABLE OF CONTENTS
1. Overview
1.1. Purpose and Scope
1.2. Relationship to Other Specifications
1.2.1. Relationship to HTML5
1.2.2. Relationship to SVG
1.2.3. Relationship to CSS
1.2.4. Future Maintenance
1.3. Terminology
1.4. Typographic Conventions
1.5. Conformance Statements
1.6. Namespace prefix mappings
2. EPUB Content Documents
2.1. XHTML Content Documents
2.1.1. Content Conformance
2.1.2. Reading System Conformance
2.1.3. HTML5 Extensions
2.1.3.1. Semantic Markup
© ISO/IEC 2020 – All rights reserved 1
2.1.3.1.1. Semantic Inflection
2.1.3.1.1.1. Introduction
2.1.3.1.1.2. The epub:type Attribute
2.1.3.1.1.3. Vocabulary Association
2.1.3.1.1.4. Processing Requirements
2.1.3.1.2. Semantic Enrichment
2.1.3.1.2.1. Introduction
2.1.3.1.2.2. Content Conformance
2.1.3.1.2.3. Processing Requirements
2.1.3.2. SSML Attributes
2.1.3.2.1. Overview
2.1.3.2.2. The ssml:ph attribute
2.1.3.2.3. The ssml:alphabet attribute
2.1.3.3. Content Switching
2.1.3.3.1. Introduction
2.1.3.3.2. Definition
2.1.3.3.2.1. The epub:switch Element
2.1.3.3.2.2. The epub:case Element
2.1.3.3.2.3. The epub:default Element
2.1.3.3.3. Processing
2.1.3.4. The epub:trigger Element
2.1.3.5. Alternate Style Tags
2.1.3.6. Custom Attributes
2.1.3.7. The aria-describedat Attribute
2.1.4. HTML5 Deviations and Constraints
2.1.4.1. Embedded MathML
2.1.4.1.1. Introduction
2.1.4.1.2. Content Conformance
2.1.4.1.3. Reading System Conformance
2.1.4.1.4. Alternative Content
2.1.4.2. Embedded SVG
2.1.4.2.1. Embedded SVG and CSS
2.1.4.3. Unicode Restrictions
2.1.4.4. Discouraged Constructs
2.1.4.5. Special Considerations
2.1.4.5.1. The body element
2.2. EPUB Navigation Documents
2.2.1. Introduction
2.2.2. Content Conformance
2.2.3. Reading System Conformance
2.2.4. EPUB Navigation Document Definition
2.2.4.1. The nav Element: Restrictions
2.2.4.2. The nav Element: Types
2.2.4.2.1. The toc nav Element
2.2.4.2.2. The page-list nav Element
2.2.4.2.3. The landmarks nav Element
2.2.4.2.4. Other nav Elements
2.2.4.3. The hidden attribute
2.3. SVG Content Documents
2.3.1. Introduction
2.3.2. Content Conformance
2.3.3. Restrictions on SVG 1.1
2.3.4. Reading System Conformance
2.3.5. Semantic Inflection
2.4. Scripted Content Documents
2.4.1. Scripting Contexts
2.4.2. Content Conformance
2.4.3. Reading System Conformance
2.4.4. Security Considerations
2.4.5. Event Model Considerations
2.5. Fixed-Layout Documents
2.5.1. Introduction
2.5.2. Reading System Conformance
2 © ISO/IEC 2020 – All rights reserved
2.5.3. Viewport Rendering
2.5.4. Content Dimensions for XHTML and SVG
2.5.4.1. Expressing ICB Dimensions in XHTML
2.5.4.2. Expressing ICB Dimensions in SVG
3. EPUB Style Sheets
3.1. Content Conformance
3.2. Reading System Conformance
3.3. EPUB 3 CSS Profile
3.3.1. CSS 2.1
3.3.2. CSS 2.0
3.3.3. CSS 3.0 Speech
3.3.4. CSS Fonts Level 3
3.3.5. CSS Text Level 3
3.3.6. CSS Text Decoration Level 3
3.3.7. CSS Writing Modes
3.3.8. Selectors
3.3.9. Media Queries
3.3.10. CSS Namespaces
3.3.11. CSS Multi-Column Layout
3.3.12. Ruby Positioning
3.3.13. Display Property Values oeb-page-head and oeb-page-foot [DEPRECATED]
4. PLS Documents
4.1. Overview
4.2. EPUB Publication Conformance
4.3. Content Conformance
4.4. Reading System Conformance
A. JavaScript epubReadingSystem Object
A.1. Syntax
A.2. Description
A.3. Properties
A.4. Methods
A.4.1. hasFeature
A.4.1.1. Syntax
A.4.1.2. Description
A.4.1.3. Features
B. -epub-fullsize-kana Character Mapping Reference
C. Acknowledgements and Contributors
References
› 1 Overview
› 1.1 Purpose and Scope
This section is informative
This specification, EPUB Content Documents 3.0.1, defines profiles of HTML5, SVG, and CSS for
use in the context of EPUB® Publications.
This specification is one of a family of related specifications that compose EPUB 3, the third major
revision of an interchange and delivery format for digital publications based on XML and Web
Standards. It is meant to be read and understood in concert with the other specifications that make up
EPUB 3:
© ISO/IEC 2020 – All rights reserved 3
The EPUB 3 Overview [EPUB3Overview], which provides an informative overview of EPUB and
a roadmap to the rest of the EPUB 3 documents. The Overview should be read first.
EPUB Publications 3.0.1 [Publications301], which defines the semantics and overarching
conformance requirements for each Rendition of an EPUB Publication.
EPUB Open Container Format (OCF) 3.0.1 [OCF301], which defines a file format and
processing model for encapsulating a set of related resources into a single-file (ZIP) EPUB
Container.
EPUB Media Overlays 3.0.1 [MediaOverlays301], which defines a format and a processing
model for synchronization of text and audio.
This specification supersedes EPUB Content Documents 3.0 [ContentDocs30]. Refer to
[EPUB3Changes] for information on differences between this specification and its predecessor.
› 1.2 Relationship to Other Specifications
This section is informative
› 1.2.1 Relationship to HTML5
The XHTML document type defined by this specification is based on W3C [HTML5], and inherits all
definitions of semantics, structure and processing behaviors from the HTML5 specification unless
otherwise specified.
In addition, this specification defines a set of extensions to the W3C HTML5 document model that
Authors may include in XHTML Content Documents.
This specification defines a simplified processing model that does not require Reading Systems to
support scripting, HTML5 forms or the HTML5 DOM. EPUB Reading Systems conformant with this
specification are only required to be able to process a conforming EPUB Content Document. As
support for scripting and HTML5 forms are optional Reading System features, a conformant Reading
System might not be a fully-conformant HTML5 User Agent (i.e., it might not implement the complete
HTML5 processing model).
› 1.2.2 Relationship to SVG
This specification defines a restricted subset of SVG 1.1 to represent vector graphics inline in XHTML
Content Documents and as standalone SVG Content Documents.
› 1.2.3 Relationship to CSS
The CSS profile defined in this specification has CSS 2.1 [CSS2.1] as its baseline. Any CSS Style
Sheet that conforms to CSS 2.1 may be used in the context of an EPUB Publication, except as noted
in CSS 2.1.
This specification also incorporates features defined by CSS3 Modules and introduces EPUB-specific
CSS constructs.
4 © ISO/IEC 2020 – All rights reserved
› 1.2.4 Future Maintenance
This specification references W3C specifications that are not yet final, and incompatible changes to
them may occur in the future that would cause EPUB 3 Content Documents that were previously
conformant to no longer be conformant to the latest versions of the referenced specifications.
The IDPF anticipates revising this specification if and when such incompatible changes occur,
updating the normative constraints defined herein as necessary.
› 1.3 Terminology
EPUB Publication
A collection of one or more Renditions conforming to this specification and its sibling
specifications , packaged in an EPUB Container.
An EPUB Publication typically represents a single intellectual or artistic work, but this
specification and its sibling specifications do not circumscribe the nature of the content.
Rendition
A logical document entity consisting of a set of interrelated resources representing one
rendering of an EPUB Publication.
Publication Resource
A resource that contains content or instructions that contribute to the logic and rendering of
at least one Rendition of an EPUB Publication. In the absence of this resource, the EPUB
Publication might not render as intended by the Author. Examples of Publication Resources
include a Rendition's Package Document, EPUB Content Document, EPUB Style Sheets,
audio, video, images, embedded fonts and scripts.
With the exception of the Package Document itself, the Publication Resources required to
render a Rendition are listed in that Rendition's manifest [Publications301] and bundled in
the EPUB Container file (unless specified otherwise in Publication Resource Locations
[Publications301] ).
Examples of resources that are not Publication Resources include those identified by the
Package Document link [Publications301] element and those identified in outbound
hyperlinks that resolve outside the EPUB Container (e.g., referenced from an [HTML5] a
element href attribute).
Core Media Type Resource
A Publication Resource that is a Core Media Type and may therefore be included in the
EPUB Publication without the provision of fallbacks [Publications301] .
EPUB Content Document
A Publication Resource that conforms to one of the EPUB Content Document definitions
(XHTML or SVG).
An EPUB Content Document is a Core Media Type, and may therefore be included in the
EPUB Publication without the provision of fallbacks [Publications301] .
XHTML Content Document
© ISO/IEC 2020 – All rights reserved 5
An EPUB Content Document conforming to the profile of [HTML5] defined in XHTML
Content Documents.
XHTML Content Documents use the XHTML syntax of [HTML5].
SVG Content Document
An EPUB Content Document conforming to the constraints expressed in SVG Content
Documents.
EPUB Navigation Document
A specialization of the XHTML Content Document, containing human- and machine-
readable global navigation information, conforming to the constraints expressed in EPUB
Navigation Documents.
Scripted Content Document
An EPUB Content Document that includes scripting or an XHTML Content Document that
contains HTML5 forms elements.
Refer to Scripted Content Documents for more information.
Top-level Content Document
An EPUB Content Document referenced from the spine, whether directly or via a fallback
chain [Publications301] .
Fixed-Layout Document
An EPUB Content Document directly referenced from the spine that has been designated
pre-paginated in the Package Document, as defined in The rendition:layout Pr
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.