
Listing 1

<!DOCTYPE HTML PUBLIC “-//W3C//
DTD HTML 4.01 Transitional//EN”
“http://www.w3.org/TR/html4/loose.dtd”>
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv=”Content-Type”
content=”text/html; charset=iso-8859-1”>
</head>
<body>
</body>
</html>


Listing 2

<!DOCTYPE html PUBLIC “-//W3C//
DTD XHTML 1.0 Transitional//EN”
“http://www.w3.org/TR/xhtml1/DTD/
xhtml1-transitional.dtd”>
<html xmlns=”http://www.w3.org/1999/xhtml”>


Listing 3

<!DOCTYPE html PUBLIC “-//
W3C//DTD XHTML 1.0 Strict//EN”
“http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd”>
<!DOCTYPE html PUBLIC “-//W3C//DTD HTML 4.01 //EN”>

Listing 4

<script language=”javascript”>
function displayMode() {
theMode = document.compatMode;
alert(theMode);
}
</script>

Listing 5

<form>
<input type=”button”
name=”Button” value=”Display
Mode” onClick=”displayMode()”>
</form>