<hr /> 标签可以在 HTML 页面中创建水平线，通常用来分隔文章中的小节
<!DOCTYPE HTML> <html> <body> <p> This is a paragraph </p><hr /> <p> This is a paragraph </p><hr /> <p> This is a paragraph </p> </body> </html>
效果如下：
This is a paragraph
This is a paragraph
This is a paragraph