This is why we are cooked. Just because you can, doesn’t mean you should.

?tab[0]=/some/url&tab[1]=/some/resource&activeTab=0

Bam, you have tabs in the url. I can duplicate the tab, share my view, or whatever. Assuming the other user/tab/window/profile has access to these resources, it’ll show exactly the same thing. I can even bookmark it!

You can even add popups:

?popupModal=saveorleave

This state probably won’t be applied on an entry, but what’s great is that pushing [back] in the browser is the same effect as cancel! If you click “leave” then you do a “replace state” instead of a “push state” navigation, so the user doesn’t go back to a modal…

This was, at one point, decently standard logic. Then people who don’t know how browsers work started creating frameworks and reinventing things.

I digress. I’m just so glad I left the front end 15 years ago, I’d lose my shit if I were dealing with this kind of stuff every day.