For years I've been using the Responsive and Off-Canvas Menu for my mobile menu. https://www.drupal.org/project/responsive_menu

I really like the functionality and how easy it is to use and configure. But it throws up three accessibility errors, which are known in the issue queue but relatively inactive. I can't really wait around for the fixes to come through unfortunately.

So does anyone else have suggestions for an easy to use mobile menu module? I really prefer the slide-in/off-canvas menus as opposed to the accordion expanding ones. yale.edu has a great menu on a drupal site but I don't know if that is an available module or something custom.