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HTML

              
                <div class="container" id="container">
</div>
              
            
!

CSS

              
                .container 
  margin-top: 15px
textarea
  resize: vertical
  height: 100%
              
            
!

JS

              
                var DisplayContainer = React.createClass({
    updateValue:function(modifiedValue){
        this.setState({
            value: modifiedValue
        })
    },
    getInitialState:function(){
        return{
            value:'#Testing *mark*down\n####What is there to test?\n****\n'+
          '+ Everything\n+ Nothing\n* Whatever you want!\n----\n' +
          '| Code        | None Code |\n' +
          '-------------- | -------------   |\n' +
          '| `*Hi*`        | *Hi*             |\n' + 
          '| `**Bye**`   | **Bye**        |\n' +
          '| `~~Die~~` | ~~Die~~     |\n' +
          '____\n' +
          '```\nfunction hello_world() {\n' +
          '    alert("**HELLO WORLD**!");\n}\n```\n' +
          '>Notice that the `**` don\'t do anything\n\n' +
          '####Have fun with this!\n*~[Herman Fassett](https://freecodecamp.com/hermanfassett)*'
        }
    },
    rawMarkup: function(value) {
      var rawMarkup = marked(value, {sanitize: true});
      return { __html: rawMarkup };
    },
    render:function(){
        return (
          <div className="row">
            <div className="col-md-6">
              <RawInput value={this.state.value} updateValue={this.updateValue}/>
            </div>
            <div className="col-md-6">
              <span dangerouslySetInnerHTML={this.rawMarkup(this.state.value)} />
            </div>
          </div>
        );
    }
});
 
var RawInput = React.createClass({
    update:function(){
        var modifiedValue=this.refs.inputValue.getDOMNode().value;
        this.props.updateValue(modifiedValue);
    },
    render:function(){
        return (<textarea rows="22" type="text" ref="inputValue" value={this.props.value} onChange={this.update} className="form-control" />)
    }
});
 
React.render(<DisplayContainer />,document.getElementById("container"));
              
            
!
999px

Console