React

HTML

<div id="app"></div>

CSS

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

.done {
  color: rgba(0, 0, 0, 0.3);
  text-decoration: line-through;
}

input {
  margin-right: 5px;
}

.parent {
  background-color: orange;
}

React

class TodoApp extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
    	items: [
      	{ text: "Learn JavaScript", done: false },
        { text: "Learn React", done: false },
        { text: "Play around in JSFiddle", done: true },
        { text: "Build something awesome", done: true }
      ]
    }
  }
  
  render() {
    return (
      <div className="parent" onClick={() => alert('x')}>
      <p>Alert anywhere on this div</p>
      <div className="children">
      <button>Do not alert On this element click</button>
      <p>Alert anywhere on this div</p>
      </div>
      </div>
    )
  }
}

ReactDOM.render(<TodoApp />, document.querySelector("#app"))