W3School TIY Editor
W3School 在线教程
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暗黑模式
运行代码
<html> <body> <form> Email: <input type="text" alt="Email input field" id="email" /> </form> <p>The alt text for the text field is: <script type="text/javascript"> x=document.getElementById('email'); document.write(x.alt); </script></p> </body> </html>