30 lines
1.8 KiB
Markdown
30 lines
1.8 KiB
Markdown
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---
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sidebar_label: Accessibility
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---
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# Accessibility class
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The Accessibility class provides methods for inspecting Chromium's accessibility tree. The accessibility tree is used by assistive technology such as [screen readers](https://en.wikipedia.org/wiki/Screen_reader) or [switches](https://en.wikipedia.org/wiki/Switch_access).
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**Signature:**
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```typescript
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export declare class Accessibility
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```
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## Remarks
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Accessibility is a very platform-specific thing. On different platforms, there are different screen readers that might have wildly different output.
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Blink - Chrome's rendering engine - has a concept of "accessibility tree", which is then translated into different platform-specific APIs. Accessibility namespace gives users access to the Blink Accessibility Tree.
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Most of the accessibility tree gets filtered out when converting from Blink AX Tree to Platform-specific AX-Tree or by assistive technologies themselves. By default, Puppeteer tries to approximate this filtering, exposing only the "interesting" nodes of the tree.
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The constructor for this class is marked as internal. Third-party code should not call the constructor directly or create subclasses that extend the `Accessibility` class.
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## Methods
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| Method | Modifiers | Description |
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| ---------------------------------------------------------- | --------- | -------------------------------------------------------------------------------------------------------------------------- |
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| [snapshot(options)](./puppeteer.accessibility.snapshot.md) | | Captures the current state of the accessibility tree. The returned object represents the root accessible node of the page. |
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