<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>span</title>
</head>
<body>
<label for="username">username:</label>
<input id="username" type="text" name="xx">
</body>
</html>
原文：https://www.cnblogs.com/liujun5319/p/9657937.html