What does "tr[class^="row"]" mean in Javascript : <p>What does this <code>^</code> mean in the following code line:  </p>

<pre><code>tr[class^="row"]
</code></pre>

<p>In the HTML how does it looks like? if used:</p>

<pre><code>var rows = document.querySelectorAll('tr[class^="row"]');
</code></pre>
