We expose this on Mac as NSAccessibilityValueAutofilledAttribute and iOS as _accessibilityValueIsAutofilled, but nothing actually uses these.
<rdar://problem/97362766>
Created attachment 461106 [details] Patch
Created attachment 461107 [details] Patch
Created attachment 461115 [details] Patch
Committed 252723@main (b336a53b180c): <https://commits.webkit.org/252723@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 461115 [details].