Extraneous Alternative Text
Alternative text should convey the content and function of an image, but it should not be used to convey additional information that is not presented visually by the image. For example, file size, file format, copyright details, that a graphical link opens in a new window, link destination, price (on e-commerce sites), keywords for search engines, etc. should not be included in alternative text. If this content is important, it should be included in the page in a way (such as in nearby text) that makes it available to all users. If this information is not necessary, it should be removed or may be presented in the title attribute value (which is intended for this type of advisory information).
