title: Get url from href using AngleSharp library
body: <p>I'm using c# with AngleSharp library to read URL from <code>&lt;a&gt;</code> 
  I can read content easily using</p>
  
  <pre><code>var items = document.QuerySelectorAll("a");
  </code></pre>
  
  <p>But what shall I do, to read URL from <code>href</code> attribute in all <code>&lt;a&gt;</code> tags?</p>