While [accessibility standards are written for humans](https://web.dev/learn/accessibility/why),
many of the design principles are also helpful for agents that want to
understand your website. Agents review the
[accessibility tree](https://web.dev/articles/the-accessibility-tree)
to identify interactive elements.

While some humans use visual cues to understand a buttons purpose,
missing labels can block users with visual disabilities and agents
from completing a task. The Lighthouse audit can help you verify that your
page has a complete accessibility tree.

For more information on how to improve your site's accessibility, see the
[Accessibility audits
documentation](https://developer.chrome.com/docs/lighthouse/accessibility).

> [!TIP]
> **Tip:** Take the [Learn Accessibility](https://web.dev/learn/accessibility) course to further improve your website's accessibility.