四个通用属性
id:相当于身份证号
class:相当于类别
style:元素的外形轮廓颜色等描述
title:标签
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<style type="text/css">
img{
width: 300px;
border-radius: 50%;
border: 2px solid #666;
}
</style>
<img src="IMG_0164.JPG" alt="夏蔡如" >
</video>
</body>
</html>
