ight": 600
  }
}</pre>
</div>

<p>
The <code>'main'</code> property of <code>package.json</code> specifies a web-page to be rendered in
the main window.</p>

<p>
	<code>app.html</code>:
</p>

<div class="code">
<pre>
&lt;html&gt;
  &lt;head&gt;
    &lt;script src="app.js"&gt;&lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;div&gt;
      The greatest common divisor of
      &lt;span id="x"&gt;&lt;/span&gt; and
      &lt;span id="y"&gt;&lt;/span&gt; is
      &lt;span id="z"&gt;&lt;/span&gt;.
    &lt;/di