W3School TIY Editor
W3School 在线教程
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暗黑模式
运行代码
<!DOCTYPE html> <html> <head> <style> input:focus { background-color: yellow; } </style> </head> <body> <form action="/demo/html/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="Submit"> </form> </body> </html>