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An ARIA slider exposes its min, max, and current value, but no step size. Indie UI provides a way to change the value, but even absent that it might be valuable for assistive technology to know the plausible step size that's allowed when changing a range value. Note that <input type=range> already supports a step attribute. I propose aria-valuestep Example: <div role="slider" tabindex=0 aria-valuemin=0 aria-valuemax=100 aria-valuestep=10 aria-value=70>70%</div>
https://github.com/w3c/aria/issues/471