chromium/chrome/test/data/extensions/api_test/dom/closed_shadow_root_from_background_page/manifest.json

{
  "name": "chrome.dom shadow root test",
  "version": "0.1",
  "manifest_version": 2,
  "description": "tests that a background script from an extension can access the closed shadow root via chrome.dom",
  "background": {
    "page": "background.html"
  }
}