# Constraint validation

The browser process that checks whether supported form controls meet their declared rules.

## What is **Constraint validation**?

**Constraint validation** — The browser process that checks whether supported form controls meet their declared rules.

Level: Apprentice · [More HTML terms at this level](https://www.ask-codey.com/glossary/subjects/html/apprentice)

Updated: September 27, 2026

Source: https://www.ask-codey.com/glossary/constraint-validation