Safari recently announced an "Apple Intelligence" feature where the web browser, rather than being either
* A viewer for a formatted document (what browsers mostly are today)
* A presentation layer for the display of semantic content (what browsers originally were, what Safari becomes in Reader Mode)
The browser is a new, third thing
* A cuisinart that turns other people's writing into content slurry in-place
By way of a "summarization" feature.
Firefox has a tracking issue for just this.