warning of usability and accessibility should be added to section of autofocus attribute

[mtrootyy]

section of autofocus attribute in W3C HTML5.3
http://w3c.github.io/html/sec-forms.html#autofocusing-a-form-control-the-autofocus-attribute

Warning!
Use of the autofocus attribute can reduce usability and accessibility for users. Users of assistive technology can be adversively affected, because its use overrides the default behaviour of assistive technology to display content at the top of a document in the viewport, or announce content from the start of the document. Users with cognitive disabilities can also be disorientated by unexpected focus movement upon page load.
User agents should provide a method for users to disable the autofocus attribute behaviour.

The above should be added to section of autofocus attribute in HTML Living Standard too.
Because the above is important usability and accessibility issues.

[annevk]

At a high level it makes sense as overall advice around focus, perhaps with individual API endpoints such as autofocus and focus() pointing to that advice.