Result Size: 625 x 534
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<!DOCTYPE html>
<html>
<body>
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<h1>img longdesc 属性</h1>
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<!-- 描述与图片在同一页面上 -->
<img src="w3html.gif" alt="begtut.com" width="100" height="132" longdesc="#w3htmlExplained">
​
<!-- 描述在外部页面 -->
<img src="w3html.gif" alt="begtut.com" width="100" height="132" longdesc="w3html.txt">
​
<!-- 该描述是外部页面中的描述之一 -->
<img src="w3html.gif" alt="begtut.com" width="100" height="132" longdesc="http://example.com/desc#item3">
​
<!-- 描述包含在数据中：URI -->
<img src="w3html.gif" alt="begtut.com" width="100" height="132" 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">
​
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<div id="w3htmlExplained">
  <h2>Image w3html.gif</h2>
  <p>图片说明...</p>
</div>
​
</body>
</html>
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​