Insert HTML Button

Try it yourself:

Edit in JSFiddle

HTML

<div id="froala-editor"></div>

JAVASCRIPT

<script>
  $(function() {
    $.FroalaEditor.DefineIcon('insertHTML', {NAME: 'plus'});
    $.FroalaEditor.RegisterCommand('insertHTML', {
      title: 'Insert HTML',
      focus: true,
      undo: true,
      refreshAfterCallback: true,
      callback: function () {
        this.html.insert('Some Custom HTML.');
        this.undo.saveStep();
      }
    });

    $('div#froala-editor').froalaEditor({
      toolbarButtons: [
        'bold', 'italic', 'underline', 'paragraphFormat', 'formatOL',
        'formatUL', 'insertHTML', 'undo', 'redo', 'html'
      ]
    })
  });
</script>