expressionAtlasHeatmapHighcharts.render({
  target: 'highchartsContainer',
  fail: function() {
    window.alert('Something went wrong!\n\nWe can also manipulate the DOM now, e.g. change the text colour.') ;
    document.getElementById('highchartsContainer').style.color = 'red';
  },
  render: function() {window.alert('Widget mounted')}
});