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The test for the correct use of longdesc should be conditional on its application in the first place. The first check 1. Check that the img element has a longdesc attribute. is not meaningful for any img and redundant for those that actually carry the longdesc attribute. (The descripton may also mention the drawback that alternative text via longdesc is not usually accessible to sighted users and might therefore be supplied redundantly.) Proposed Change: So the test in my opinion should start with a conditional: "If longdesc is used on images to supply alternative text:" ...then test #2 and #3 (as #1 and #2)