html作业第一节
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>html</title>
</head>
<body>
<div style="width: 100px; height: 100px; background-color: red;">这是一个盒子</div>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>html</title>
</head>
<body>
<div style="width: 100px; height: 100px; background-color: red;">这是一个盒子</div>
</body>
</html>