title: HTML5 <base> Tag with root relative url
body: <p>Please help me understand the functionality of the <code>&lt;base&gt;</code> tag's href attribute.</p>
  
  <p>I have a website hosted at <code>http://goodsite.org/bob</code>. other sites are hosted at <code>http://goodsite.org/others</code>.</p>
  
  <p>I am planning to move my application to <code>http://bettersite.org/bob</code>.</p>
  
  <p>In order to support this I have a base url in my header.
      <code>&lt;base href="/bob/"&gt;</code>.</p>
  
  <p>My links look something like this: <code>&lt;a href="thatonething.img"&gt;That one thing&lt;/a&gt;</code></p>
  
  <p>As hoped I am seeing the links as expected (e.g. <code>"http://goodsite.org/bob/thatonething.img"</code>)</p>
  
  <p>Question:</p>
  
  <p><strong>Does <code>&lt;base&gt;</code> tag universally support root relative urls (i.e. <code>href="/bob/"</code>)?</strong>  </p>
  
  <p>This seems to work in my testing but I am having a little more trouble reading through the specifications. More generally I'm wanting to know if I am misusing this tag.</p>