HTML and CSS native features still surprise experienced developers
Two separate threads on the same day covered underused native HTML and CSS features, one titled 'HTML Can Do That' and another on small native web tricks. Both got strong engagement, with developers expressing genuine surprise at features like 'hidden until found,' datalist, and various CSS layout primitives that ship in every browser but get replaced by JavaScript libraries.
The datalist discussion is instructive. Someone pointed out it is not a good solution when you need strict input validation, because users can type anything. That is a real limitation. But the broader point in both threads is that the gap between what the platform natively supports and what developers actually know is still enormous, even among experienced people.
This keeps happening because the web platform ships features quietly and documentation is fragmented. MDN is comprehensive but not discoverable. Most developers learn from Stack Overflow answers that are five years old and recommend a jQuery plugin.
So what?
Before reaching for a component library or npm package, there is probably a native HTML or CSS feature that does 80 percent of what you need with zero bundle cost. This is especially relevant for founders watching performance metrics. Replacing a JavaScript autocomplete with a styled datalist is not always right, but knowing the option exists saves time.