Tests highlights for display locking in a frame.

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      "fillColor": "rgba(255, 0, 0, 0)",
      "outlineColor": "rgba(128, 0, 0, 0)",
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      "fillColor": "rgba(255, 255, 255, 0)",
      "name": "margin"
    }
  ],
  "showRulers": true,
  "showExtensionLines": true,
  "showAccessibilityInfo": true,
  "colorFormat": "hex",
  "elementInfo": {
    "tagName": "iframe",
    "idValue": "container",
    "nodeWidth": "14",
    "nodeHeight": "14",
    "isKeyboardFocusable": true,
    "accessibleName": "",
    "accessibleRole": "",
    "layoutObjectName": "LayoutIFrame",
    "isLocked": true,
    "showAccessibilityInfo": true
  }
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child{
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      "fillColor": "rgba(255, 0, 0, 0)",
      "outlineColor": "rgba(128, 0, 0, 0)",
      "name": "content"
    },
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      "fillColor": "rgba(255, 255, 255, 0)",
      "name": "margin"
    }
  ],
  "showRulers": true,
  "showExtensionLines": true,
  "showAccessibilityInfo": true,
  "colorFormat": "hex",
  "elementInfo": {
    "tagName": "iframe",
    "idValue": "container",
    "nodeWidth": "14",
    "nodeHeight": "14",
    "isKeyboardFocusable": true,
    "accessibleName": "",
    "accessibleRole": "",
    "layoutObjectName": "LayoutIFrame",
    "isLockedAncestor": true,
    "showAccessibilityInfo": true
  }
}