W3School TIY Editor
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<!DOCTYPE html> <html> <body> <h1>img longdesc 属性</h1> <!-- 描述与图片位于同一页面 --> <img src="/i/logo/w3.png" alt="w3school.com.cn" width="90" height="90" longdesc="#w3logoExplained"> <!-- 描述位于外部页面 --> <img src="/i/logo/w3.png" alt="w3school.com.cn" width="90" height="90" longdesc="w3logo.txt"> <!-- 该描述是外部页面中的若干描述之一 --> <img src="/i/logo/w3.png" alt="w3school.com.cn" width="90" height="90" longdesc="http://example.com/desc#item3"> <!-- 描述包含在 data:URI 中 --> <img src="/i/logo/w3.png" alt="w3school.com.cn" width="90" height="90" longdesc="data:text/html;charset=utf-8;,%3C!DOCTYPE%20html%3E%3Chtml%3E%3Chead%3E%3Ctitle%3EDescription%20of%20the%20Logo%3C/title%3E%3C/head%3E%3Cbody%3E%3Cp%3ESome%20description%20goes%20here%3C/body%3E%3C/html%3E"> <div id="w3logoExplained"> <h2>图像 w3.png</h2> <p>这里是图片的描述...</p> </div> </body> </html>