W3Schools 在线编辑工具（TIY） V3.0
编辑的代码:
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<html> <head> <style type="text/css"> p:first-letter { color: #ff0000; font-size:xx-large } </style> </head> <body> <p> You can use the :first-letter pseudo-element to add a special effect to the first letter of a text! </p> </body> </html>