ex:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>test</title>
</head>
<body>
<h1>一级标题</h1>
<a href="https://www.baidu.com"></a>
<img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1574164236&di=673d71a348017105679b4a79b29b5ba3&imgtype=jpg&er=1&src=http%3A%2F%2Fimg2.178.com%2Fnews%2F201706%2F292032664119%2F292033211715.jpg" alt="无法显示后提示的信息">
<img src="111.jpg" alt="">
<p>段落</p>
<u>下划线</u>
<s>删除线</s>
<b>加粗</b>
<p>666666</p>
<br>
<p>666666</p>
<p>1111111111111</p>
<hr>
<p>11111111111111</p>
</body>
</html>