Meaningful alt content for functional/important images

功能性/重要图片的 alt 包含有意义的内容

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The W3C HTML5 Specification (Working Draft) explicitly recognizes this and provides detailed examples for alt text depending on the function and context of the image.

W3C的HTML5规范(草案) 明确指出了这一点，并详细示范了如何撰写基于功能和上下文的替换文本。

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Using alt attributes for images as specified and clearly explained in the the W3C’s Techniques for WCAG 2.0.

为图像添加恰当的alt属性。 W3C的WCAG 2.0技术规范 清楚明确地解释了这一点。

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