chromium/chrome/test/data/extensions/api_test/side_panel/open_panel_errors/manifest.json

{
  "name": "sidePanel.open() errors",
  "manifest_version": 3,
  "version": "1",
  "background": {"service_worker": "background.js"},
  "side_panel": {"default_path": "default_panel.html"},
  "permissions": ["sidePanel"]
}