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Clarify the meaning of "is also available" in step #3 of F3 test

From: <noreply@w3.org>
Date: Mon, 16 Mar 2015 15:24:24 +0000
To: public-comments-wcag20@w3.org
Message-Id: <E1YXWsS-000FsS-3h@deneb.w3.org>
Name: Detlev Fischer
Email: detlev.fischer@testkreis.de
Affiliation: 3needs
Document: TD
Item Number: F3
Part of Item: Tests
Comment Type: technical
Summary of Issue: Clarify the meaning of "is also available" in step #3 of F3 test
Comment (Including rationale for any proposed change):
The third step in the test of F3 says "If an image does convey important information, the information is provided to assistive technologies and is also available when the CSS image is not displayed". 
Since assistive technologies are mentioned immediately before the bit "is also available", it is no unambiguously clear that the intent here is to require also the  *visible* presence of replaced text when content is viewed with CSS disabled (i.e. in cases where background images disappear and some suitable alternative text that is off-screen-positioned when CSS is active is shown instead). 
An additional suggestion: The use of CSS background images for controls is now very frequent, so I wonder whether a sufficient technique describing replaced text (off-screen positioned when CSS is active, replacing the image when CSS is off) would be a good idea. Such a technique currently does not exist, I bevieve. Should I draft something?

Proposed Change:
Change third step of F3 test to:
"If an image does convey important information, the information is provided to assistive technologies and is available both visually and programmatically when the CSS image is not displayed".
Received on Monday, 16 March 2015 15:24:30 UTC

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