A quick web prototyping tool with no dependencies above what the browser can run (JS/CSS/HTML). I'm stuck using HAML and Bootstrap to throw quick mock-ups toge

A quick web prototyping tool with no dependencies above what the browser can run (JS/CSS/HTML). I'm stuck using HAML and Bootstrap to throw quick mock-ups together. It's great and works fine but I have to load a pre-processor app (like PrePros or Koala) and HAML can't include elements into templates like header like headers/footers I have to copy/paste into every new template I'm putting together. I looked into Moustache and Hogan but neither of these offered what I'm after and they were pretty difficult to set up. I think the Mixture app will solve this when released but I've had issues getting the beta to properly run and it looks pretty bulky for what I need.