Found a small HTML, CSS, or JavaScript feature worth remembering? Send it over. A short example and a reliable source are enough; rough notes are welcome.

Submissions may be edited for clarity and to match HTMLcat’s format. Add your name or nickname and a profile link if you would like to be credited, or leave them blank to remain anonymous.

Please include sources where relevant, especially when the example or code is not your original work.

Thank you! ✨