input-image-alt-decorative
<input type="image"> with alt="" must be appropriate (manual review)
Flags <input type="image"> elements with empty alt for human review (usually not appropriate for functional controls).
Applies to. Applies to <input type="image"> elements whose alt attribute is present but empty once trimmed, and which still carry a name from another source: an ARIA name resolving to non-empty text, or a title. Without that other name there is nothing to weigh the empty alt against, and the control is input-image-alt-present's failure instead. The element must be included in the accessibility tree, and role="presentation"/"none" takes it out of scope unless it is focusable, which restores its role.
Expectation. Human review is required to confirm that the provided text alternative is accurate and appropriate.
Examples
<input type="image" src="submit.png" alt="" title="Submit order">
Empty alt is unusual on a functional control; a `title` still names it, but worth confirming the empty alt was deliberate.
<input type="image" src="submit.png" alt="Submit order">
Non-empty alt is `input-image-alt-quality`'s question, not this rule's.