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Hardware design On-screen design Next Bibliography Index Guideline 22 Guideline 21 Guideline 20 Guideline 19 Guideline 18 Guideline 17 Guideline 16 Guideline 15 Guideline 14 Guideline 13 Guideline 12 Guideline 11 Guideline 10 Guideline 9 Guideline 8 Guideline 7 Guideline 6 Guideline 5 Guideline 4 Guideline 3 Guideline 2 Guideline 1 Introduction Table of contents Previous On-screen design Hardware design Next page Bibliography Index Guideline 20 Guideline 19 Guideline 18 Guideline 17 Guideline 16 Guideline 15 Guideline 14 Guideline 13 Guideline 12 Guideline 11 Guideline 10 Guideline 9 Guideline 8 Guideline 7 Guideline 6 Guideline 5 Guideline 4 Guideline 3 Guideline 2 Guideline 1 Introduction Table of contents Previous page

"I kept getting lost and straying into other parts of the Web"

Participant in EBONI psychology evaluation

An electronic book should be treated as a closed environment, containing no links to external sources unless clearly labelled (for example in a reference section or bibliography). This assists the user in understanding the book as a single unit, avoids confusion about which pages are part of the book, and which are part of another resource, and prevents readers from getting "lost" in cyberspace.


5.1 Do not include external links in the main body of the text
5.2 If external links are provided in the reference section or bibliography, these should be clearly labelled as linking to external sources.


Consult the following recommendations from the W3C Web Content Accessibility Guidelines 1.0:
Guideline 12: Provide context and orientation information
Guideline 13: Provide clear navigation mechanisms

Figure 19.1

Figure 5. Mix of internal and external links: The Joy of Visual Perception by Peter Kaiser

In The Joy of Visual Perception, external links are mixed together with internal links. ALthough indicated as such, readers who are quickly scanning the text may easily become lost.

Click to enlarge

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Screenshot used with author's permission