title: What are the actual problems of not closing tags and attributes in HTML
body: <p>Recently a friend decided not to close his tags or attributes in HTML because it's not required and he'll save some bandwidth and download time. I told him it's a bad idea and to be "better safe than sorry", however, I could only really find 2 resources on the issue:</p>
  
  <ol>
  <li><a href="http://css-tricks.com/13286-problems-with-unquoted-attributes/">http://css-tricks.com/13286-problems-with-unquoted-attributes/</a></li>
  <li><a href="http://www.cs.tut.fi/~jkorpela/qattr.html">http://www.cs.tut.fi/~jkorpela/qattr.html</a></li>
  </ol>
  
  <p>#1 is good, but even as he said, they aren't really real world examples, which is why I went to #2, but they only really show an <code>&lt;a&gt;</code> which is much more different than most other tags/nodes.</p>
  
  <p>Is there another resource or test cases as to a better reasons to quote your attributes and close your tags?</p>