Description

Today, button and icon button only support native [disabled]. They should also support aria-disabled.

The chip component exposes an always-focusable attribute for this:

We could copy that same API, or we could add a new aria-disabled attribute to button and icon button.

Pros for always-focusable

• Aligns with chip

Pros for aria-disabled

• Aligns with existing web APIs
• Aligns with other aria-* APIs exposed on button (e.g. aria-label, aria-haspopup, etc)

I also noticed while looking at chip's implementation that it doesn't set aria-disabled on its inner button if it's disabled and always focusable. It probably should?