W3School TIY
编辑您的代码：
<html> <head> <style type="text/css"> #intro {font-weight:bold;} </style> </head> <body> <p id="intro">This is a paragraph of introduction.</p> <p>This is a paragraph.</p> <p>This is a paragraph.</p> <p>This is a paragraph.</p> <p>...</p> </body> </html>
查看结果: