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Quick Reminder that Details/Summary is the Easiest Way Ever to Make an Accordion | CSS-Tricks

Hells, yeah! Want to make an accordion widget? Use the details element as your starting point and progressively enhance from there.

Completely CSS: Progressively Collapsing Navigation | Kenan Yusuf

One way of implementing the growing/shrinking navigation pattern—an alternative to just shoving everything behind a hamburger icon.