Also, even though we can add Alt attributes to each image, pure text is even more accessible since it can be resized by users with impaired vision.

同样，我们甚至可以为每一个图像加上alt属性，对于弱视者，纯文本更可以自由的改变大小。

youdao

You can use image buttons for many purposes, although they do require you to develop images. If you want to bypass this, create an image button with Alt text and an invalid URL for its image.

可以将图像按钮用于许多用途，但是这要求您开发图像。

youdao

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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