title: In basic HTML, is the correct horizontal rule element <hr> </hr> or <hr/>
body: <p>Simple question. A basic horizontal rule, nothing fancy, no color, no size or width, no aligning, which is it... <code>&lt;hr&gt;&lt;/hr&gt;</code> or <code>&lt;hr/&gt;</code>.</p>
  
  <p>I understand which of them work, but which is PROPER.</p>