同为外部式，且没有类选择器，还有优先级吗
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>字间距</title>
<style type="text/css">
h1{letter-spacing:20px;}
h1{word-spacing:20px;}
</style>
</head>
<body>
<h1>hello world!你好！</h1>
</body>
</html>
