title: How to select DOM elements with number value id using D3
body: <p>All:</p>
  
  <p>I wonder how do I select a DIV element with id="1" in D3, I can do it in jQuery, but when I turn to D3, it gives error like:</p>
  
  <blockquote>
    <p>Uncaught DOMException: Failed to execute 'querySelector' on
    'Document': 'div.chart#1' is not a valid selector</p>
  </blockquote>
  
  <pre><code>&lt;div id="1"&gt;&lt;/div&gt;
  </code></pre>
  
  <p>Thanks</p>