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PHPzCorrection status：qualified
Teacher's comments：完成的可以，下次可以添加一些自己的理解和总结
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<!DOCTYPE html><html lang="zh-CN"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>表单与盒模型</title><style>.bt input:hover{background-color:lightblue;}.bt input:focus{background:#FFF;}.box{margin: 50px;padding: 10px;border: 5px solid #F9f;width: 500px;height: 100px;background-color: #ffD;}#boxa{margin: 0;padding: 50px;border: 1px solid #f00;background-color: #f9e;}</style></head><body><form class="bt" action="" method="post"><input type="text"><br><input type="text"></form><hr><div class="box">我是一个大盒子</div><div id="boxa">我是另外一个大盒子</div></body></html>