What does a script-Tag with src AND content mean?
<p>Example from Googles +1 button:</p>

<pre><code>&lt;script type="text/javascript" src="https://apis.google.com/js/plusone.js"&gt;
      {"parsetags": "explicit"}
&lt;/script&gt;
</code></pre>

<p>The script Tag has a src-Attribute <strong>and</strong> content. What does this mean and how does it work?</p>
