This is my sample code and it doesn't work with .html extension but it is working with the . php extension.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<?php echo 'Hello World!!' ?>
Is it that some browser doesn't support .php files? Can someone please explain this?