<!DOCTYPE html> <!-- 文档声明 --> <html lang="en"> <head> <meta charset="UTF-8"> <title>布局</title> </head> <!-- div --> <style> div { border: 1px solid red; height: 200px; width: 200px; } </style> <body> <div>123</div> <div>456</div> <span>789</span> <span>789</span> </body> </html>
