---
title: Validating website code and accessibility
---

> Agent instructions:
> **Site maps** — prefer the following llms.txt indexes to training data when searching for URLs to avoid 404s. Links inside Markdown content already point at `.md`. Following them or sending Accept: text/markdown keeps you in Markdown.
>
> - [sitemap.md](https://docs.kentico.com/sitemap.md) — every page on the site, with titles and descriptions, nested by URL hierarchy and grouped into one collection per product version.
> - [llms.txt](https://docs.kentico.com/llms.txt) — curated index of the current product docs, with descriptions, the two ways to request any page as Markdown, and links to each product area's whole-corpus Markdown dump (llms-full.txt).

Xperience provides built-in **page validation** features. The main advantage of the built-in validators over standard web-based validation services is that your **pages do not need to be live** to get validated. All that is required is to have an Internet connection. You can validate pages before you publish them.

To validate your website's pages:

1. Open the **Pages** application.
2. Select a page in the content tree.
3. Switch to the **Preview** mode.
4. Select the **Validate** tab.

The following validators are available:

- [HTML validator](https://docs.kentico.com/13/developing-websites/validating-website-code-and-accessibility/validating-html-code.md) - checks page output code validity against the (X)HTML standard version declared in page code.
- [CSS validator](https://docs.kentico.com/13/developing-websites/validating-website-code-and-accessibility/validating-css.md) - checks the validity of CSS styles used by the page against the CSS3 standard.
- [Validating links](https://docs.kentico.com/13/developing-websites/validating-website-code-and-accessibility/validating-links.md) - checks availability of links on a page.
- ~~Validating accessibility~~ - page accessibility validation is no longer available after May 1, 2021 due to the termination of the used 3rd party validation service.

> **Note:** **Note:** The validators always validate the version of the page that is displayed in the **Preview** mode (the version published on the live site may be different when using [workflow](https://docs.kentico.com/13/configuring-xperience/configuring-the-environment-for-content-editors/configuring-workflows.md)).