The Rules

The quality reference list for digital book

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The Rules

If the digital book establishes one or more standards or references, a link is offered to each of them.

Rule 021

Each decorative image is tagged as such

022

Each link image has a text alternative describing the link function

Rule 023

Information images are provided with a text alternative.

Rule 024

Images have a useful and reasonable size and resolution.

Rule 025

The included objects are provided with an appropriate fallback alternative.

Rule 026

Each audio and video-content is accompanied by its text transcript.

Renewal no. 027

Videos have synced subtitles

Rule 028

The hardness of empty or audio content is indicated.

Rule 029

Videos are triggered by the user.

Rule 030

Sounds are triggered by the user.

Rule 031

Animations, sounds and blinks can be paused.

Rule 032

Animation unfolding does not block navigation or access to content.

Rule 033

The international code is available for all phone numbers

Rule 034

Country is accurate for all mailing addresses

Rule 035

The source code of each portion indicates the main language of the content

036

The main language of the target page of a link is identifiable when it differs from that of the original page

Renewal no. 037

Every language change is reported.

Rule 038

Each link is assigned a title in the source code.

Renewal no. 039

The label for each link describes its function or the nature of the content it points to.

Rule 040