摘要：<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>方块</title> </head> <body> &nb
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>方块</title> </head> <body> <div style="width: 100px;height: 100px;background-color: red;"> </div> </body> </html>
