html is now xhtml? need some one to better explain.?

David

New member
ive been using this sitehttp://www.w3schools.com/ and i finally finished the html basic tutorial and im now goin to the html advance tutorial and i see this
http://i1018.photobucket.com/albums/af307/dummyprofile/huh.jpg can someone explain it.
i kept reading and the <h1></h1> is different its now
<html>

<head>

<style type="text/css">
h1 {color: red}
h3 {color: blue}
</style>

</head>

<body>
<h1>This is header 1</h1>
<h3>This is header 3</h3>
</body>

</html>

am i going to have to change everything?
 
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