Update F3

[patrickhlauke]

Whether or not a text alternative is visually/visibly presented to users when CSS is disabled/unavailable is beyond the scope of 1.1.1. Rewording the last failure check to make the original intention clearer.

x-ref #4660 (comment)

EDIT: after some further consideration, this PR also:

• changes the wording throughout from "important information" to "relevant information"
• in the tests, it adds the caveat that the "relevant information" conveyed by the image is only of interest if it is not already conveyed elsewhere on the page

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[juliemoynat]

Can we also fix the points 2 and 3 speaking of images conveying "important information"? It should be just "information" no matter the importance, right?

[patrickhlauke]

@juliemoynat that point is a bit trickier. because intrinsically, any image will "convey information" depending on how you define "information" (at the very least, they convey "visual information"). it's a potentially slippery slope.

[patrickhlauke]

@juliemoynat revisited this tonight and did come up with a further tweak that hopefully works to address your concern, while not going down the slippery slope of ambiguity i feared... see 521f1e4

[juliemoynat]

@patrickhlauke oh! I like it! I think there is no ambiguity anymore with "relevant" instead of "important". Thankyou!