title: What if I use #! instead of # in href of anchor tag <a>?
body: <p>I have used #! in href of a tag in my website. It does not throws the user on top of the page if he/she clicks the link. But my question is, is it legal?</p>
  
  <pre><code>&lt;a href="#!"&gt;Click here&lt;/a&gt;
  </code></pre>
  
  <p>instead of</p>
  
  <pre><code>&lt;a href="#"&gt;Click here&lt;/a&gt;
  </code></pre>