[Bug 22369] New: Add the term "equivalent purpose" to the general requirements for ALT text to harmonize with WCAG

https://www.w3.org/Bugs/Public/show_bug.cgi?id=22369

            Bug ID: 22369
           Summary: Add the term "equivalent purpose" to the general
                    requirements for ALT text to harmonize with WCAG
    Classification: Unclassified
           Product: HTML WG
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P2
         Component: HTML5 spec
          Assignee: dave.null@w3.org
          Reporter: david100@sympatico.ca
        QA Contact: public-html-bugzilla@w3.org
                CC: mike@w3.org, public-html-admin@w3.org,
                    public-html-wg-issue-tracking@w3.org

It is a great general section on ALT text... however, the term Equivalent
Purpose is a pivotal term in WCAG 1.1.1 when describing it's requirements. You
catch the spirit of Equivalent Purpose, but can we work that in somewhere into
the general section?

http://www.w3.org/TR/UNDERSTANDING-WCAG20/text-equiv-all.html

Definitions in Merriam-Webster

Equivalent (adjective) 
Corresponding or virtually identical especially in effect or function

Purpose (noun)
Something set up as an object or end to be attained, intention

============
Suggested amendment
"... the value must be an appropriate replacement for the image, <add>It should
serve the equivalent purpose except for exceptions discussed below.</add> 
============

The exceptions being those in WCAG 1.1.1

     Controls, Input: If non-text content is a control or accepts user input,
then it has a name that describes its purpose. (Refer to Guideline 4.1 for
additional requirements for controls and content that accepts user input.)

    Time-Based Media: If non-text content is time-based media, then text
alternatives at least provide descriptive identification of the non-text
content. (Refer to Guideline 1.2 for additional requirements for media.)

    Test: If non-text content is a test or exercise that would be invalid if
presented in text, then text alternatives at least provide descriptive
identification of the non-text content.

    Sensory: If non-text content is primarily intended to create a specific
sensory experience, then text alternatives at least provide descriptive
identification of the non-text content.

    CAPTCHA: If the purpose of non-text content is to confirm that content is
being accessed by a person rather than a computer, then text alternatives that
identify and describe the purpose of the non-text content are provided, and
alternative forms of CAPTCHA using output modes for different types of sensory
perception are provided to accommodate different disabilities.

    Decoration, Formatting, Invisible: If non-text content is pure decoration,
is used only for visual formatting, or is not presented to users, then it is
implemented in a way that it can be ignored by assistive technology.

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Received on Friday, 14 June 2013 14:50:18 UTC