If you’re using the Underscores theme (also knows as _s) by Automattic, you may have tried to add multiple menus to the page and been frustrated when they don’t work on mobile.

Here’s a bit of Javascript to add to the theme’s navigation.js file to fix the issue:

https://gist.github.com/macbookandrew/74fd6dd1d101debcf6890778052609d4