code: function renderButton( element ) {
           var developerButton = document.createElement( 'BUTTON' );
           developerButton.onclick = handleButtonClicked();
           developerButton.type = 'button';
           developerButton.className = 'btn btn-warning';
           developerButton.innerHTML = features.button.htmlLabel;
           element.appendChild( developerButton );
        }
docs: /////////////////////////////////////////////////////////////////////////////////////////////////////////