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<!DOCTYPE html> <html> <head> <style> input:invalid { border: 2px solid red; } </style> </head> <body> <h3>:invalid 选择器的演示。</h3> <input type="email" value="supportEmail"> <p>尝试输入合法的电子邮件地址，以查看样式消失。</p> <p><strong>注意</strong>：Internet Explorer 9 及更早版本不支持 :invalid 选择器。</p> </body> </html>