It's not perfect, but Edge will let one take a simple full page screenshot with Ctrl+Shift+S. It results in a hefty PNG but at least it's a visual copy of everything which might suffice for a certain set of purposes (e.g. links will be lost, so it's not good for that).

I can still right-click > Save any page as .html, but that doesn't guarantee server streamed stuff, media, images, etc. will be preserved correctly.