html - 具有 alt 属性但没有文本的 img 是否满足 WCAG 2.0 : Technique H30?

Question

我正在阅读WCAG 2.0 Technique H30 .

程序说:

For each link in the content that uses this technique:

1. Check that text or a text alternative for non-text content is included in the a element
2. If an img element is the only content of the a element, check that its text alternative describes the purpose of the link
3. If the a element contains one or more img element(s) and the text alternative of the img element(s) is empty, check that the text of the link describes the purpose of the link
4. If the a element only contains text, check that the text describes the purpose of the link

我关注的是第 2 点:如果 img 具有 alt 属性，但没有替代文本怎么办？

例如，以下代码是否满足该技术要求？

<a href="http://www.mystite.com"> 
  <img src="http://www.mystite.com/myimage.jpg" alt="Description of the image" />
</a>

Answer 1

我想说你的例子不满足技术要求。

您的 a 元素仅包含一个 img 元素。根据 H30，该图像的 alt 属性应包含有关链接目标的信息，而不是有关图像本身的信息。

http://www.w3.org/TR/WCAG20-TECHS/H30.html#H30-description :

When an image is the only content of a link, the text alternative for the image describes the unique function of the link.