="header-section-number">8.1</span> Shared Variables</h2>
<p>Up until now the topic of shared variables had been omitted as it was not relevant, however, it will be from here onwards. Indeed we are about to discover how to further manipulate the widget; changing the data, resizing, and more. This will generally involve the JavaScript instance of the visualisation, the object named <code>controller</code> in the gio package, which, being defined in the <code>renderValue</code> function, is not accessible out