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HTML

              
                <div class="container-fluid">
  <div class="row topLine">
    <div class="col-sm-5">
      <h1> Emmet Dojo:</h1>
    </div>
    <div class="col-sm-7">
      <button type="button" class="btn btn-danger float-right" onClick="clearContents()">CLEAR</button>
    </div>
  </div>
  <textarea class="form-control" rows="10" id="emmetT" placeholder="Instructions: type emmet expressions (consult Syntax, Examples and HTML below) + tab"></textarea>

  <div class="row">
    <br />
    <div class="col-sm-4">
      <h3>Syntax :</h3>
      <div class="well pre-scrollable columnA">
        <ul class="list-unstyled">
          <li>Child: <kbd>></kbd></li>
          <li>Sibling: <kbd>+</kbd></li>
          <li>Climb-up: <kbd>^</kbd></li>
          <li>Multiplication: <kbd>*</kbd></li>
          <li>Grouping: <kbd>()</kbd></li>
          <li>Id: <kbd>elem#</kbd></li>
          <li>Class: <kbd>elem.</kbd></li>
          <li>Custom attributes: <kbd>[attr]</kbd></li>
          <li>Item numbering: <kbd>$</kbd></li>
          <li>Text: <kbd>{}</kbd></li>
        </ul>
      </div>

    </div>

    <div class="col-sm-4">
      <h3>Examples :</h3>
      <div class="well pre-scrollable columnB">
        <ul class="list-unstyled">
          <li>nav>ul>li</li>

          <li>div+p+bq</li>
          <li>div+div>p>span+em^bq</li>
          <li>div+div>p>span+em^^^bq</li>
          <li>ul>li*5</li>
          <li>div>(header>ul>li*2>a)+footer>p</li>
          <li>(div>dl>(dt+dd)*3)+footer>p</li>
          <li>div#header</li>
          <li>div.class1</li>
          <li>div#footer.class1.class2.class3</li>
          <li>td[title="Hello world!" colspan=3]</li>
          <li>ul>li.item$*5</li>
          <li>ul>li.item$$$*5</li>
          <li>ul>li.item$@-*5</li>
          <li>ul>li.item$@3*5</li>
          <li>ul>li.item$@-3*5</li>
          <li>a{Click me}</li>
        </ul>
      </div>
    </div>

    <div class="col-sm-4">
      <h3>HTML :</h3>
      <div class="well pre-scrollable columnC">
        <ul class="list-unstyled">
          <li><kbd>!</kbd> html:5</li>
          <li><kbd>a:link</kbd> </li>
          <li><kbd>br</kbd></li>
          <li><kbd>link:css</kbd></li>
          <li><kbd>form:post</kbd></li>
          <li><kbd>btn</kbd></li>
          <li><kbd>lorem</kbd></li>
        </ul>
      </div>
    </div>
  </div>
  <div class="panel panel-default">
  <div class="panel-body">
    Official Emmet site: <a href="http://emmet.io" target="_blank">emmet.io</a>&nbsp;&nbsp;&nbsp;
<a href="http://docs.emmet.io/cheat-sheet/" target="_blank">Cheat Sheet</a>
  </div>
</div>
  </div>
</div>
              
            
!

CSS

              
                body{
  background-color:#222;
/*   padding:10px; */
}

h1{
color: cornflowerBlue;
  margin:0;
}

h3, h5{
color: cornflowerBlue;
}

.topLine{
  margin-bottom:10px;
}

.columnA{
  height:200px;
  max-height: 200px;
/*   min-width: 240px; */
  font-size:16px;
}

.columnB{
  height:200px;
  max-height: 200px;
/*   min-width: 300px; */
  font-size:15px;
}
.columnB ul{
  margin-left:-10px;
}

.columnC{
  height:200px;
  max-height: 200px;
  padding-left:10px;
  font-size:16px;
}

.btn-danger{
  margin-top:6px;
}

textarea{
  margin-bottom:-30px;
}


              
            
!

JS

              
                // Magic Sauce:
// https://github.com/emmetio/textarea
// Only HTML for now


emmet.require('textarea').setup({
    pretty_break: true, // enable formatted line breaks (when inserting 
                        // between opening and closing tag) 
    use_tab: true       // expand abbreviations by Tab key
});

function clearContents(){
  document.getElementById("emmetT").value = '';
}


              
            
!
999px

Console