# What is Accessibility Tree?

*Development · Last updated: November 4, 2026*

The hierarchical structure created by the operating system to explain on-screen elements to assistive technologies.

## Overview

The accessibility tree is a computer-understandable map of the buttons, text, and images on the screen. Screen readers used by visually impaired users read this tree to voice what is on the screen. Recently, AI agents also directly use this tree to understand the screen.

***Analogy:** It is similar to a tactile embossed map of a building printed for the blind. While a sighted person directly observes the building, this map summarizes the structure of the building and the locations of the doors.*

## How it works

The operating system and browsers convert the visual interface into a textual and structural tree form in the background. Software or AI bots scan this tree to detect clickable areas on the screen.

## Where it is used

It functions in screen reader software, automation tools, and AI agents that control the computer by reading on-screen elements rather than using a mouse.

## Commonly confused with

It is confused with HTML source code. Source code is the raw structure of the site, whereas the accessibility tree is the visible state that the browser or system filters and organizes for accessibility.

## Questions and answers

**Why do AI models use the accessibility tree?**

Instead of examining visual pixels one by one, reading structured texts directly is much faster and more error-free for AI.

**Why is it important when developing a website?**

A properly labeled structure both ensures access for individuals with disabilities and lays the groundwork for AI tools to correctly understand the page.

## Related terms

- [Computer Use](https://trescout.com/en/dictionary/computer-use/)
- [User Interface](https://trescout.com/en/dictionary/user-interface/)
- [Frontend](https://trescout.com/en/dictionary/frontend/)

## Related tools

- [Agent Browser](https://trescout.com/en/discover/agent-browser/)

This explanation was written in plain language for TreScout with AI and **machine-translated** from the Turkish original · the Turkish version prevails. If something looks wrong or missing, write to [hello@trescout.com](mailto:hello@trescout.com). [Read in Turkish →](https://trescout.com/dictionary/accessibility-tree/)

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Source: TreScout Dictionary · https://trescout.com/en/dictionary/accessibility-tree/