编辑下面的代码:【加编码】
<html> <head> <style> h1 {font-size:250%;} h2 {font-size:200%;} p {font-size:100%;} </style> </head> <body> <h1>This is heading 1</h1> <h2>This is heading 2</h2> <p>This is a paragraph.</p> </body> </html>
结果: 【此窗口】 帮助?
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