W3School TIY Editor
W3School 在线教程
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暗黑模式
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<html> <body> <img id="compman" src="/i/eg_compman.gif" longdesc="/example/hdom/compman_description.html" alt="Computerman" /> <br /> <script type="text/javascript"> var x=document.getElementById("compman"); document.write("Description for image: "); document.write('<a href="' + x.longDesc + '">Description</a>'); </script> </body> </html>