Implicit role of <img alt aria-label="foo" />

[Jym77]

In a recent change to ARIA in HTML, images with an empty alt but having another "img naming method" (aria-label(ledby)) now have an implicit role of img.

We should had an example like <img alt aria-label="foo" /> to our "Image has accessible name rule".

Note that this change hasn't been reflected in the HTML AAM yet: w3c/html-aam#577

[giacomo-petri]

We should also handle the opposite side of it: Element marked as decorative is not exposed - Failed Example 2

Related opened issue: #2212