I'm trying to make a simple strict HTML file that includes jquery:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<title>Test File</title>
<link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"></script>
</head>
<body>
</body>
</html>
But Firefox displays the following errors in the error console when I try to load it:
Error: d.style is undefined
Source File: http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js
Line: 33
Error: jQuery is not defined
Source File: http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js
Line: 19
Help! I don't understand :(
Is the site served as text/html or application/xml+xhtml?
(It was supposed to be a question, but apparently it was the answer.)
来源：https://stackoverflow.com/questions/2687777/why-does-my-simple-strict-xhtml-file-give-errors-when-i-include-jquery