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Accessibility tree and browser-reported issues. tree returns roles, names, and states for the page or a subtree (by ref/selector); node returns full properties for one element; check runs a quick audit (missing alt/labels/names, duplicate ids); issues lists problems Chrome reported (Audits domain: cookies, CORS, CSP, mixed content, deprecations, low contrast, quirks…) with affected node refs.
The tool names stay the same across browsers. See browser selection and Firefox and Zen exceptions before choosing an operation.

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Parameters

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integer
Target tab id from browser_tabs, which lists tabs across all windows. Defaults to the agent’s most recently opened usable tab, or the only usable tab. Otherwise select a listed tabId.
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enum
required
One of: tree, node, check, issues.
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string
Element ref from browser_snapshot, e.g. “e12”
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string
 
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integer
 
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integer
 
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string
issues: filter by issue code substring, e.g. “Cookie”, “MixedContent”, “Cors”, “ContentSecurityPolicy”, “LowTextContrast”
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string
 
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boolean
 

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Example