See the discussion in this issue for more context: - https://github.com/w3c/html-aam/issues/545 The code to create aria-details relationships for non-popover use cases of anchor positioning was likely a mistake. Since popovers and other semantic relationships *do* create aria-details, and the remaining use cases are likely non-semantic, there is a desire *not* to create these relationships in the non-semantic cases. Since most common use cases use popovers, this change should hopefully not be too noticeable to users.