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Re: problems with Checkpoint 2.1

From: Jon Gunderson <jongund@ux1.cso.uiuc.edu>
Date: Thu, 01 Feb 2001 12:48:19 -0600
Message-Id: <>
To: Al Gilman <asgilman@iamdigex.net>, w3c-wai-ua@w3.org
Responses in JRG:

  An example would be an SVG graphic used in a web page.  The SVG
>actually containts a lot of words, and the words are internally stored in a
>legible form following the suggestions of the access note for SVG.  But the
>User Agent doesn't implement SVG.  The user should be able to glance at the
>source as text and find the natural language embedded there even 'though they
>don't get the graphic rendition.  In addition to this, if the user has a
>for the format of any object in the content, then the user must have the
>to have that content rendered with that player.

JRG: So this would require source views for unsupported or unrecognized 
formats.  Is XML based formats a special case?

>Another application scenario is that if what the author of the SMIL thought
>user didn't need is an audio track, then the user must have access to an audio
>rendering of that object if the User Agent supports that type of audio format
>at all.  The user should be able to chose from the full range of feasible
>options, based on the formatting of the data and the formats implemented by
>The user must have their choice including a) if it is a format that the User
>Agent implements, the user must have the choice of formatted rendering and b)
>if the format is a text format and the User Agent implements Internet Media
>Type text/plain, then the user must have the choice of text presentation.  The
>requirement is the union of these two, not the intersection.
>Another example:  If the document links to a stylesheet in text/css , and the
>User Agent implements text/plain, then the user must be able to view the text
>of the stylesheet whether or not the User Agent implements CSS.

Are you saying that the UA must provide source views of linked resources?
Is an image SRC considered link information?
Do you know of anything that does this?

><possible new>
>    2.1 Make all [158]content available through the user interface. For 
> formats
>that the User Agent implements (see [162]checkpoint 6.2), make the content
>available through the implemented rendering process   In addition, for all
>ref]text formats, make a source text view available. [Priority 1]

JRG: should "implemented" be "specified".  If the rendering is not 
specified anywhere, do we want to include the concept of using conventions?

>[edit to reduce the note, perhaps.]
>           Note: In general, user agents render content through the user
>           interface according to the instructions of implemented
>           specifications (see [162]checkpoint 6.2). However, some users
>           may not be able to access this content, even when the user
>           agent renders it according to specification (e.g., for scripts
>           or style sheets). Therefore, this checkpoint includes the
>           requirement that user agents make available raw text content
>           (including attributes, style sheets, etc.) through the user
>           interface. Although this view (which may be a [163]document
>           source view) is an important part of a solution for providing
>           access to content, it is not a sufficient solution on its own
>           for all content. This checkpoint does not require that all
>           content be available through every [164]viewport. See
>           [165]guideline 5 for more information about programmatic access
>           to content.
>           [166]Techniques for checkpoint 2.1
>AG::  Insert definition at end of [new ref]
>Text formats:  This includes the following two subcategoies.  First,all media
>objects given an Internet Media Type of 'text', that is text/plain, text/HTML,
>text/* or text/anything.  Second, all SGML and XML applications regardless of
>Internet Media Type, including HTML 4.01, XHTML 1.1, SMIL, SVG, etc.

Jon Gunderson, Ph.D., ATP
Coordinator of Assistive Communication and Information Technology
Division of Rehabilitation - Education Services
College of Applied Life Studies
University of Illinois at Urbana/Champaign
1207 S. Oak Street, Champaign, IL  61820

Voice: (217) 244-5870
Fax: (217) 333-0248

E-mail: jongund@uiuc.edu

WWW: http://www.staff.uiuc.edu/~jongund
WWW: http://www.w3.org/wai/ua
Received on Thursday, 1 February 2001 13:46:24 UTC

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