Add a unique id of element HTML

Edit code and click me	Your Result (Some examples do not work in Google Chrome):
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> </head> <body style="font-family:Arial, Helvetica, sans-serif;color:#3c3c3c;"> <h1 id="header">Xhtml.co.il schools</h1> </body> </html>
Edit the code above and click to see the result	www.xhtml.co.il - Try it yourself