HTMLcat: 42 small, native web tricks worth remembering

HTMLcat collects 42 short, practical web development tips covering HTML, CSS, and JavaScript features often overlooked. Each post-it pairs a useful platform feature with a small example and the caveat that matters, noting limited or experimental support. The collection includes modern CSS selectors like :has() and :where(), the Popover API, View Transitions, and container queries, plus classic tricks like centering and hiding scrollbars. The site emphasizes testing with real browsers and assistive technology, keeping fallbacks for unsupported features.