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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Học CSS3 toidicode.com</title> </head> <style type="text/css" media="screen"> a[href^="https://toidicode.com"] { background-color: orange; display: block; color: white; } </style> <body> <a href="https://toidicode.com">Toidicode.com</a> <a href="http://thanhtai.info">Thanh Tai</a> <a href="https://toidicode.com/live">Toidicode.com live</a> </body> </html>
