Howdy emailers!

I've went through some of the original hamburger menu thread, posts and the navigation contest. I couldn't however find an up-to-date working hamburger menu, that complied with some of the most tested clients (from our POV) such as Outlook - Office 365 and Gmail. I've tried solving the puzzle but it still remains tricky getting this hack going.

What is the best hamburger menu code you've found?