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w3c / wcag

Web Content Accessibility Guidelines
https://w3c.github.io/wcag/guidelines/22/
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Clarify the meaning of "is also available" in step #3 of F3 test #80

Closed awkawk closed 2 years ago

awkawk commented 9 years ago

Name: Detlev Fischer Affiliation: 3needs Document: TD Item Number: F3 Part of Item: Tests Comment Type: technical 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".

mraccess77 commented 3 years ago

Perhaps, but what's I'm suggesting is that the location of the text alternative may matter and impact meaning. I suppose it could be caught under SC 1.3.2 or 1.3.1, etc. The intent of programmatically associated was to ensure that if the image alt text did not provide everything the person could know where to look to find the alternative. CSS background images are widely used for informative graphics and while off-screen CSS text is used - others just say well the same information is generally conveyed in the page text as a whole so it's already provided. That may not be an equivalent experience though as if you see the image you get the immediate meaning while if you are a screen reader user you have to read the entire page to figure out that same information or go look for the the text which is not inline where it was needed but rather elsewhere on the page away from it's context. Context is important.

fstrr commented 2 years ago

Closing this as inactive. If this does need re-opening, please do so.