I'm not sure how much <details> can be customized, but there's also a CSS-only r...

ryanwhitney on April 25, 2021 | parent | context | favorite | on: Using <details> for menus and dialogs (2019)

I'm not sure how much <details> can be customized, but there's also a CSS-only route using a hidden checkbox beneath the hamburger icon and looking for the input[type="checkbox"]:checked selector. (Example: https://codepen.io/plavookac/pen/qomrMw)