chromium/chrome/test/data/extensions/api_test/app_background_page/basic/manifest.json

{
  "name": "app_background_page/basic",
  "version": "0.1",
  "manifest_version": 2,
  "description": "Tests that web-extent background pages can be opened, shared, and closed.",
  "background": {
    "page": "test.html"
  },
  "permissions": ["tabs", "http://a.com/*"],
  "content_scripts": [
    {
      "matches": ["http://a.com/*"],
      "js": ["content_script.js"],
      "run_at": "document_end"
    }
  ]
}