Rule: Prevent using a role attribute value that matches the default semantic value of the element.

[rwjblue]

{{! bad }}

<button role="button">O_o</button>

{{! good }}
<div role="button"></div>

[rwjblue]

@nathanhammond / @Robdel12 / @sarenji (and anyone else) - Where can I get the canonical list of "default" roles by tag name?

[nathanhammond]

@rwjblue ARIA roles are fortunately all based on RDF and have super-specific inheritance: https://www.w3.org/TR/wai-aria/roles
https://www.w3.org/TR/wai-aria/rdf_model.svg

The related concepts specify which semantics are similar, but does not guarantee 1:1 behavior. ARIA is a spec on top of a spec and there may be reasons to attach the same role as the default semantics for that browser. I'm not sure that this rule is one we want to pursue.

[rwjblue]

Gotcha, thank you!