I have noticed some inconsistency in Mac - Voiceover. Aria-live should read the content when it changes, only once. But when the content is in the iframe voiceover reads aria-live content twice. This happens only in the Mac - Chrome - Voiceover combination. There is no issue in Safari. Below are the sample links. I want to know whether this is an issue are not.
2. Content is in iframe - https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/ARIA_Live_Regions#Simple_live_regions