canvas-text-alternative-quality
<canvas> text alternative must be appropriate (manual review)
Flags <canvas> elements with a detected text alternative for human review of equivalence and appropriateness.
Applies to. Applies to <canvas> elements that already carry a text alternative: fallback content inside the element, an ARIA name, or a title. A <canvas> with none of those has no alternative whose quality could be judged; that's canvas-text-alternative-present's failure. 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
<canvas width="400" height="200">Bar chart</canvas>
The fallback text "Bar chart" is present but generic — worth confirming it conveys the actual data, not just the chart type.
<canvas width="400" height="200"></canvas>
No fallback content, ARIA name, or title exists to review; that's `canvas-text-alternative-present`'s failure instead.