Layout shift a11y checker

manifest.json

{
  "name": "Layout shift text override check",
  "description": "Override existing type styles with the accessible requirements to test for layout shift.",
  "version": "1.0",
  "manifest_version": 2,
  "icons": {
    "16": "/images/layoutShift-16.png",
    "32": "/images/layoutShift-32.png",
    "48": "/images/layoutShift-48.png",
    "128": "/images/layoutShift-128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_icon": {
      "16": "/images/layoutShift-16.png",
      "32": "/images/layoutShift-32.png",
      "48": "/images/layoutShift-48.png",
      "128": "/images/layoutShift-128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "css": [
        "override-type.css"
      ],
      "js": [
        "override-type.js"
      ],
      "run_at": "document_end",
      "all_frames": false
    }
  ]
}