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<!DOCTYPE html> <html> <head> <style> input:focus { background-color: yellow; } </style> </head> <body> <form action="/action_page.php" method="get"> First name: <input type="text" name="fname"><br> Last name: <input type="text" name="lname"><br> <input type="submit" value="提交"> </form> <p><b>注意：</b> IE8 仅在指定了 !DOCTYPE 时才支持 :focus 伪类。</p> </body> </html>