Ask HN: A way to search for how a website was created

I often find myself wondering what or if a framework was used to create a specific website and it would be pretty neat to be able to just put a url into a search field and see that. I end up trying to figure it out from the source but that's difficult unless it's like WordPress or WIX...

I even use view-source: from the phone quite a lot...

If there's no website maybe you could drop some tips about unique things specific frameworks use?