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