Please follow these steps
1. Go to child directory, run:

```bash
$ npm install             # Install project dependencies
$ npm start               # Compile and launch
```

2. Go to parent direcotry, run:

```bash
$ npm install             # Install project dependencies
$ npm start               # Compile and launch
```

You will then be able to access it at http://localhost:9876. Like this:

![demo](https://raw.githubusercontent.com/hcl1687/iframe-channel/master/img/demo.png)