If you have a Text-to-Speech Reader, and it comes across a website that has graphics Most likely it`s not gonna be or would like to read the graphics.

当你使用文字阅读器，遇到网页中的图片时,很可能阅读器,没办法读出图片来。

麻省理工公开课 - 媒体、教育、市场课程节选