html-w3c-validator/example/package.json

{
  "name": "example",
  "private": true,
  "scripts": {
    "start": "serve ./build",
    "test:html-w3c-validator": "start-server-and-test 'start' 'http://localhost:3000' 'html-w3c-validator'"
  },
  "devDependencies": {
    "serve": "13.0.2",
    "start-server-and-test": "1.14.0",
    "html-w3c-validator": "file:.."
  }
}