Reference by tag name and id : Selector ID « jQuery « JavaScript Tutorial

<html>
  <head>
    <script type="text/javascript" src="js/jquery-1.3.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function(){
               
              alert($("div#result1").hasClass("selected").toString());
        });
    </script>
    <style>
      .selected { color:red; }
      .highlight { background:yellow; }
    </style>    
  </head>
  <body>
    <body>
      <p>A</p>
      <p>B</p>
      <p>C</p>
      <div id="result1"></div>
    </body>
</html>

30.8.Selector ID
	30.8.1.	ID index selector
	30.8.2.	ID selector
	30.8.3.	ID selector only
	30.8.4.	Select by ID
	30.8.5.	Assign value to DIV with ID
	30.8.6.	Reference by tag name and id
	30.8.7.	Removes the element with the ID "selected" from the set of all paragraphs.
	30.8.8.	Finds the element with the id "myDiv".
	30.8.9.	Finds the element with the id "myID.entry[1]".