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?

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.