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What is the benefit to add null alt=””? is it only to pass validation or it has more reason
and how it should be write?
like this, no space
alt=""
or this with one blank space
alt=" "
Other answers have pointed out the requirements in the standard. Here is a practical example:
Given blank alt text, lynx will render:
Given a missing alt attribute, lynx will render:
You don’t want your content to have irrelevant filenames scattered throughout.