源代码:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Wfuyu教程(wfuyu.com)</title> <style> p.ex1 {margin-top:2cm;} </style> </head> <body> <p>A paragraph with no margins specified.</p> <p class="ex1">A paragraph with a 2cm top margin.</p> <p>A paragraph with no margins specified.</p> </body> </html>
运行结果：