# Built-in Validation

A few HTML attributes let the browser check a form's answers before it sends them, so people fix a missing email or a short ZIP code right away, with no JavaScript.

![Codey's cheat sheet for Built-in Validation: A few HTML attributes let the browser check a form's answers before it sends them, so people fix a missing email or a short ZIP code right away, with no JavaScript.](https://fsdtrainingmedia.blob.core.windows.net/public/images/2026/10/fc154d82e6424b57b809b41b090843c4.webp)

- Category: HTML
- Level: Apprentice
- Tags: Constraint validation, html, max (html), min (html), minlength, pattern (html), required, web-development
- Updated: October 31, 2026

Source: https://www.ask-codey.com/cheat-sheets/html-forms-built-in-validation-cheat-sheet