We've seen examples where devs have put aria-multinline=false on elements with contenteditable, with a role that doesn't support them. The reason for this turns out to be that Safari will otherwise announce that element as being a multinline element. We've seen this on an element with role=combobox, but it would be good to test whether this behavior happens with other roles too.

At least the following should pass axe-core:

<!-- This passes -->
<div aria-multiline="false" tabindex="0" aria-labelledby="foo" role="combobox" contenteditable>