Users can't interact with a text input using VoiceOver on iOS/Safari. The logic that updates the text field's state is broke when we switched to shadow dom.
The current logic uses domDocument.activeElement == editableElement to determine if the input field currently has focus, but this condition always returns false. We have to use flutterViewEmbedder.glassPaneShadow!.activeElement in order to get the active element instead of domDocument.activeElement throughout the update() function.

https://github.com/flutter/engine/blob/4cb5be089e587d71bf9b283cb72d21668baf81be/lib/web_ui/lib/src/engine/semantics/text_field.dart#L365-#L392