Because in reality browsers can't do much. The API and spec are broken as-is. I'll quote my top-level comment: > This is both bad UX and bad for accessibility

Because in reality browsers can't do much. The API and spec are broken as-is. I'll quote my top-level comment: > This is both bad UX and bad for accessibility (you cannot navigate concatenated strings on the accessibility tree). And this isn't even implementation dependent, it's the spec! > Not using popups for important information is accessibility 101, but browsers cannot afford to do anything else without interfering with the actual document. Plus it doesn't matter who's to blame: people with accessibility issues need access now.