css三角形
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>三角形制作</title> <style type="text/css"> h1 { position: relative; padding-left: 50px; } h1:after { content: ''; display: inline-block; width: 0; height: 0; border: 20px solid transparent; border-top-color: #F00; position: absolute; left: 0px; top: 20px; } </style> </head> <body> <h1>一级标题</h1> </body> </html>