title: Why is my 'hr' in HTML displaying with an extra half pixel on it?
body: <p>It's just a standard HTML 'hr' tag but the line is displaying with an odd extra pixel.  My only CSS is:</p>
  
  <pre><code>hr {margin:0%;line-height: 100%;}
  </code></pre>
  
  <p>Apparently I don't have enough rep to include images of the issue, so you'll have to go off my description.</p>