You can change the property of an accessible object during SWF file playback. For example, to indicate changes that take place on a keyframe in an animation. However, different vendor’s screen readers treat new objects on frames differently. Some screen readers might read only the new object, whereas other screen readers might re‑read the entire document.

To reduce the chance of causing a screen reader to emit extra “chatter” that can annoy users, avoid animating the text, buttons, and input text fields in your document. Also, avoid making your content loop.

Flash Player can’t determine the actual text content of features such as Text Break Apart to animate text. Screen readers can only provide accurate accessibility to information-carrying graphics such as icons and gestural animation, if you provide names and descriptions for these objects in your document or for the entire Flash application. You can also add supplementary text to your document or shift important content from graphics to text.