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<!DOCTYPE html> <html> <head> <style> input:default { box-shadow: 0 0 1px 1px red; } </style> </head> <body> <h1>:default 默认选择器</h1> <p>:default 选择器选择一组相关元素中的默认表单元素。</p> <p>默认选中“男性”单选按钮：</p> <form action=""> <input type="radio" name="gender" value="male" checked> Male<br> <input type="radio" name="gender" value="female"> Female<br> <input type="radio" name="gender" value="other"> Other </form> <p>Internet Explorer 11 及更早版本不支持 :default 选择器。</p> </body> </html>