title: How to display line numbers using GitHub Flavored Markdown "code"?
body: <p>I know I can use "code" in GitHub Flavored Markdown to highlight a code snippet. But I am not able to display line numbers for a snippet. Is there a way to do so?</p>
  
  <pre><code>```javascript
  var s = "JavaScript syntax highlighting";
  alert(s);
  ```
  </code></pre>
  
  <p>I want a line number to be put at the beginning of each line, like this:</p>
  
  <pre><code>1    var s = "JavaScript syntax highlighting";
  2    alert(s);
  </code></pre>