# Why HTML validation errors matter

> Browsers repair broken HTML silently, but each repair is a guess and can differ between browsers and crawlers.

Best practices · HTML version: https://getreport.app/learn/html-validation

## HTML validation errors

Passing looks like: No HTML validation errors.

**Why it matters.** Invalid HTML usually still renders, but each error is a place where browsers, screen readers and search engine parsers may disagree about what you meant.

**How to fix it.**

1. Run the page through the W3C validator and fix unclosed tags, duplicate ids and misplaced elements first.
2. Ignore warnings about vendor attributes if the page renders correctly everywhere.

Check your own page: https://getreport.app/