AlternateProposal
Alternate Proposal: Providing Human-Parseable and Machine-Processible Textual Alternatives and Markers for Static Images (GreggV)
Case 1: Image Needs alt, Author Provides It
<img src="123.jpg" alt="Photo of my granny"> OR use labelledby AND (if and only if needed) describedby
A 'Text alternative' is provided. Different alternatives are possible.
Case 2: Author Specifies the Image Should be Ignored
ariarole="presentation" AND/OR alt="" is used
Case 3: Image Needs alt, Author Can't/Won't Provide It, Also Doesn't Care If Code is Valid
<img src="123.jpg">
Case 4: Image needs text alternative, author can't/won't provide it, but does want code to be valid
ALTNEEDED is used instead of ALT
Content is VALID if ANY of the following is true
- ALT="<text alternative">
- ALT=""
- ALTNEEDED
- labelledby