This page renders fine; validation still fails

My page looks fine in the browser, so I don't know if the markup underneath is actually broken.

BeginnerRead 6 minDoing: under an hour6 steps

What you'll have at the end

A markup file run through the validator with every error read, understood, and fixed one by one.

Before you start

You need

An HTML page you already wrote and believe is finished, since nothing looks wrong when you open it in a browser.

Not covered

Wiring the checker into a build step or CI job so it runs on every commit automatically; this recipe stops at fixing one file by hand.

Leans on

6 steps

Build a valid HTML5 page from a blank file

You're starting a page from nothing rather than fixing one you already wrote.

Rebuild a div-soup page with real semantic landmarks

Your page already checks clean, but every section is still a plain div with no real landmark meaning.

Checked 20 Aug 2026