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<!DOCTYPE html>
<html>
<body>
  
<script>
class Car {
  constructor(name) {
    this.brand = name;
  }
  present() {
    return 'I have a ' + this.brand;
  }
}
class Model extends Car {
  constructor(name, mod) {
    super(name);
    this.model = mod;
  }  
  show() {
    return this.present() + ', it is a ' + this.model
  }
}
const mycar = new Model("Ford", "Mustang");
document.write(mycar.show());
</script>
</body>
</html>