The ARIA (Accessible Rich Internet Application) attribute is read along with alt text on an image, which also works for a long description. Currently avoiding the longdesc image attribute is most common since it isn’t widely recognized as a useful SEO technique. The color contrast should be considered and tested. The Paciello Group offers a great tool**. Infographics used as an image make it easy to share content. Their popularity continues to resurface regardless of some talk of users’ preferring them less. When the Infographic is provided via HTML styled with CSS, Google’s cache of the infographic text content of each page is richer. It is possible to offer it within an iframe with indexable text that may be hidden in a CSS clip in the iframe HTML. Be sure that your graphic designer knows how to create an infographic using indexable text and links created with HTML and CSS. It is important to take every step you can to help get your site indexed faster.