{
  "description": "A well-formed [accessibility tree](http://goo.gle/lighthouse-agentic-a11y) helps AI agents to navigate and interact with the page."
}

{
  "ruleId": "aria-roles",
  "impact": "critical",
  "description": "Ensure all elements with a role attribute use a valid value",
  "tags": [
    "cat.aria",
    "wcag2a",
    "wcag412",
    "EN-301-549",
    "EN-9.4.1.2",
    "RGAAv4",
    "RGAA-7.1.1"
  ],
  "affectedNodeCount": 1,
  "nodes": [
    {
      "target": [
        "a[title=\"Weather Line App\"]"
      ],
      "html": {
        "discarded": true,
        "reason": "[discarded fetched document data]",
        "originalType": "string",
        "originalLength": 85
      },
      "failureSummary": "Fix all of the following:\n  Role must be one of the valid ARIA roles: bookmark"
    }
  ]
}

{
  "displayValue": "2 layout shifts found",
  "description": "These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to [windowing](https://web.dev/articles/cls#what_is_cls). [Learn how to improve CLS](https://web.dev/articles/optimize-cls)"
}