title: Why Unicode character for "Hearts" symbol fails with HTML
body: <p>According to my understanding the following HTML markup should display a heart symbol, but it is not. What I am missing?
  I got the data about Unicode characters here:
  <a href="http://en.wikipedia.org/wiki/Html_special_characters#Character_entity_references_in_HTML">http://en.wikipedia.org/wiki/Html_special_characters#Character_entity_references_in_HTML</a></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8" ?&gt;
  &lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"&gt;
  &lt;html xmlns="http://www.w3.org/1999/xhtml"&gt;
  &lt;head&gt;
  &lt;meta http-equiv="Content-Type" content="text/html; charset=utf-8" /&gt;
  &lt;title&gt;Hearts&lt;/title&gt;
  &lt;/head&gt;
  &lt;body&gt;
  &amp;#2665;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>