ion or <code>url</code> string. The <code>onClick</code> function will be called when the button is clicked, while the
		<code>url</code> property will be set to the anchor tag's <code>href</code>.</p>

	<pre><code class="language-javascript">Prism.plugins.toolbar.registerButton('hello-world', {
	text: 'Hello World!', // required
	onClick: function (env) { // optional
		alert('This code snippet is written in ' + env.language + '.');
	}
});</code></pre>

	<p>See how the above code registers the <code>Hello W