You say isomorphic almost like you dismiss it. I structured my site so that, in the worst case, the user has a plain old site of HTML + CSS and lots of hyperli

You say isomorphic almost like you dismiss it. I structured my site so that, in the worst case, the user has a plain old site of HTML + CSS and lots of hyperlinks that work just fine. My drop down headers default to pages that show the drop down content. The embarrassing part was I had a simple bug affecting a sizable chunk of my user-base. In a certain browser, no code would run. But I never received a single complaint, because no one noticed. Sure, some fancy extras didn't work, but they are used to that with that particular browser. The information and required functionality was there. And I didn't have to write it in both PHP AND Javascript.