title: Space at the end of title attribute in 'a' tag
body: <p>I have a link like this:</p>
  
  <pre><code>&lt;a title="Lorem ipsum " href="http://example.com"&gt;Lorem ipsum&lt;/a&gt;
  </code></pre>
  
  <p>Important is the space at the end of title attribute. If this link comes to the browser, it will change to this:</p>
  
  <pre><code>&lt;a title="Lorem ipsum " &amp;nbsp;href="http://example.com"&gt;Lorem ipsum&lt;/a&gt;
  </code></pre>
  
  <p>This is not valid link so it do not work. It is not a JavaScript problem, it is not working in Firefox 44.0.2 and Chrome 48.0.2564.116 (64-bit). W3C validator throws an error saying that "Attribute  href not allowed on element a at this point.". Why is a space at the end of title attribute a problem? It was working a while ago.</p>