# Validating Your Page

The W3C Nu HTML Checker reads your page against HTML's rules and lists every mistake with its line number, so you can find and fix what the browser quietly covered up.

![Codey's cheat sheet for Validating Your Page: The W3C Nu HTML Checker reads your page against HTML's rules and lists every mistake with its line number, so you can find and fix what the browser quietly covered up.](https://fsdtrainingmedia.blob.core.windows.net/public/images/2026/10/997a97b605044f56a2d1f4abcbb8641e.webp)

- Category: HTML
- Level: Apprentice
- Tags: html, HTML conformance checker, HTML validation, Parse error
- Updated: October 31, 2026

Source: https://www.ask-codey.com/cheat-sheets/html-validating-your-page-cheat-sheet