Alt text and image descriptions can provide essential information such as text, links, and image details. When the content presented in an image is conveyed elsewhere, such as in a caption, the image may also be given empty alt text. In rare occasions, an image of text might be used inline as a substitute for text. The first step when determining appropriate alternative text for an image is to decide if the image presents content and if the image has a function. What is alt text? While this is an awesome feature, it isn’t always the most accurate. “Search the Card Catalog" is much more useful than "Photo of a collection of books and other reading materials scattered on a library table". Neutral coverage came in at 26%, while a minority of sources were determined to be anti-war. alt and title attributes of an image are commonly referred to as alt tag Alternative (Alt) Text is meant to convey the “why” of the image as it relates to the content of a document or webpage. Alt text tells people what is in an image, such as text or basic essential details. All images are required to have an alternative text attribute. Image titles and alt texts are both attributes in an image tag that describe the content of that image. Some people understand complex information best when it's presented visually, such as as a chart or diagram, while others find that reading the information suits them better. The same image can have quite different alt text depending on its context. If someone went on your website or profile with their eyes closed, would they still be able to find their way around? As more and more people develop vision impairments, they turn to assistive technology in order to access content- read more about this in my World Sight Day 2017 post here. In this case, we should focus on writing alternative text that stands in for the visible text within the logo, without adding any extraneous information—that is, you’d want the alternative text to just say "Harvard University". I still recommend typing “null” as alt text for decorative images as opposed to leaving it blank. But, also keep it short–125 characters or less is a good guideline. However, any time an image is the only content within a link, the image MUST be given alternative text that presents the function of that link. If the image contains meaningful text, the alternate text should contain that text. Speaking of Twitter, read my post on low vision Twitter accounts to follow here, and follow me on Twitter @veron4ica here. According to W3C Accessibility Guidelines, for code to be considered W3C-valid, it is important to include both image alt text and image title text in the image for important images … In keeping with other Internet guidelines, the term " alt text" (in a code font) is used here to refer to the text supplied for the image alt parameter and which generates text for the HTML alt attribute; the term "alternative text" refers to the text equivalent for an image, regardless of where that text resides. An image description gives more details than alt text and allows someone to learn more about what is in an image that goes beyond alt text. If the image is a photograph, the alternate text should describe the photograph. Consult the content editor slides at the top of the page for more examples.Some other best practices include: 1. Decorative images should be given empty or null alt text. 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