You could maaaaybe convince me to say something like: "all content stored in [textarea] blocks" or "input type=password" CSS-type scoping, but fundamentally, it

You could maaaaybe convince me to say something like: "all content stored in [textarea] blocks" or "input type=password" CSS-type scoping, but fundamentally, it wants to rewrite _your_ content on a page, but that requires it is allowed to view and modify _all_ content of the page.