I am working with an NSAccessibilityElement that corresponds to a custom UI element that doesn't inherit from NSView or one of the other accessibility-enabled AppKit classes. I would like to update its accessibility frame as the UI element moves on the screen (so, during the animation itself), while VoiceOver is focused on this element.

Thank you for the quick reply! Could you please tell me more about this action? The documentation doesn't have any description. When is it triggered – when the user sends a scroll gesture/command, or when they focus on an element that is outside the visible area of a scroll view? I haven't worked with these constants before; just with the NSAccessibility instance methods named perform.... Will this constant have a corresponding instance method? Otherwise, should I create a NSAccessibilityCustomAction with the name of this constant and add it to the accessibilityCustomActions of my custom NSAccessibilityElement?