Commits on Sep 8, 2021

1. v4: Disabled link cleanup …

   manual backport of #34886
   
   per https://www.w3.org/TR/html-aria/#docconformance
   
   > It is NOT RECOMMENDED to use `aria-disabled="true"` on an `a` element with an `href` attribute.
   >
   >NOTE
   >If a link needs to be "disabled", remove the `href` attribute.
   
   This PR removes the unnecessary `href="#"`, `tabindex="-1"`, and `aria-disabled="true"` from disabled links in both docs pages and examples. `aria-disabled="true"` *is* kept for disabled link-based buttons (that have `role="button"`) as there it's appropriate to use (you *want* to convey to assistive technologies that this thing you're claiming is a button is also disabled at the moment)
   
   Further, the PR extends the "Link functionality caveat" to show the "proper" way (removing `href` and adding `.disabled` class only) to disable a link, but then explains what to do if that's not possible (and then keeps an example with all the traditional `href="#" tabindex="-1" aria-disabled="true"`, but explains clearly that it's not ideal). Same sort of explanation is also added to the pointer event utilities page

   

   patrickhlauke committed Sep 8, 2021
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