title: jquery cross-browser supports issue
body: <p>I came to know that <a href="http://jquery.com/browser-support/" rel="nofollow">jquery supports all including old browsers</a></p>
  
  <p>But I tried to add a placeholder for search box and it is not working in IE8</p>
  
  <pre><code>jQuery(document).ready(function(){
      $('#search').attr('placeholder','search....');                          
  });
  </code></pre>
  
  <p>So I want to know more about cross-browser supports. As said does it work actually or not?</p>
  
  <hr>
  
  <p>I know the html attribute <code>placeholder</code> is not supported. But my question is about with jquery.</p>