HTML Form Validation Without JavaScript: 10 Useful Techniques
Validate HTML forms with zero JavaScript using 10 live demos: required, pattern, min/max, :valid/:invalid, :has() and more. Fork and edit each one.
HTML Form Validation Without JavaScript: 10 Useful Techniques
Most developers reach for JavaScript the moment a form needs validation — a keyup listener here, a regex check there, a red border toggled in code. But the browser has been able to validate forms on its own since HTML5 shipped required , pattern , typed inputs, and a full set of CSS pseudo-classes that expose the result. No listener, no library, no risk of the validation running before the script has finished loading. The browser blocks the submit itself, focuses the offending field, and shows its own message — and CSS alone can style every step of that. The 10 demos below are all real forms — type into them, try submitting them empty or malformed, and watch the browser's native validation UI do the work. Every embed also has a Fork & Edit button that opens the exact snippet, already running, in My Code — FWD Tools' free in-browser editor. Loosen a pattern , delete a required , and watch what the browser stops catching — that's a faster way to understand constraint validati…
