Select inside body tag : Selector relation « jQuery « JavaScript Tutorial

<html>
  <head>
    <style>
      .test{ border: 1px solid red; }
    </style>
  
    <script type="text/javascript" src="js/jquery-1.3.2.js"></script>
    <script type="text/javascript">
    $(document).ready(function(){
           $("span:first").text($(":hidden", document.body).length + " hidden elements.");
    });

    </script>


  </head>
  <body>
      <span></span>
        <div></div>
        <div style="display:none;">Hider!</div>
        <div></div>
        <div></div>
        <form>
            <input type="hidden" />
            <input type="hidden" />
            <input type="hidden" />
        </form>
        <span></span>
  </body>
</html>

30.9.Selector relation
	30.9.1.	prev + next
	30.9.2.	prev ~ siblings
	30.9.3.	parent() matches all elements that are parents
	30.9.4.	next(prev, next): Finds all inputs that are next to a label.
	30.9.5.	has(selector) matches the specified selector.
	30.9.6.	descendant(ancestor, descendant): Finds all input descendants of forms.
	30.9.7.	Select inside body tag
	30.9.8.	Select if DIV has another tag
	30.9.9.	Match parents
	30.9.10.	Remove all elements that have a descendant ol element