---
title: Validating accesibility
related:
  - https://docs.kentico.com/k82/configuring-kentico/using-output-filters.md
---

> 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).

The system allows you to validate the accessibility of pages. You can perform the validation against several standards:

- BITV 1.0 (Level 2)
- [U.S. Section 508](http://www.section508.gov/index.cfm?fuseAction=stdsSum#web)
- Stanca Act
- [WCAG 1.0 (Level A)](http://www.w3.org/TR/WCAG10/)
- WCAG 1.0 (Level AA)
- WCAG 1.0 (Level AAA)
- [WCAG 2.0 (Level A)](http://www.w3.org/TR/WCAG/)
- WCAG 2.0 (Level AA)
- WCAG 2.0 (Level AAA)

We recommend using the [HTML validator](https://docs.kentico.com/k82/developing-websites/validating-website-code-and-accessibility/validating-html-code.md), [CSS validator](https://docs.kentico.com/k82/developing-websites/validating-website-code-and-accessibility/validating-css.md) and [Link checker](https://docs.kentico.com/k82/developing-websites/validating-website-code-and-accessibility/validating-links.md) before you use the accessibility validator.

To validate the accessibility of a page:

> **Warning:** **Warning**: During validation, your data is sent to an external **3rd party validation service**. If you have sensitive, non‑public content, we recommend using other types of validation.

1. Open the **Pages** application.
2. Select the page in the content tree.
3. Switch to **Preview** mode.
4. Open the **Validate -> Accessibility** tab.
5. Choose the validation **Standard**.
6. Click **Validate**.

If the page contains accessibility issues, you can view the following information for each detected problem:

- **Line** - the line number of the HTML code on which the issue appears.
- **Column** - the column of the HTML code (i.e. number of characters from the beginning of the respective line) where the issue appears.
- **Accessibility rule** - the standard's accessibility rule based on which the error was generated.
- **Error** - message describing the validity issue.
- **Fix suggestion** - description of steps that you can perform to address the accessibility issue.
- **Source** - extract of the part of the code where the accessibility issue appears.

> **Note:** **Note**: If you navigate to another page in preview mode using links on the displayed pages, and then switch to the **Validate** tab, the system still validates the page selected in the content tree.