ISO IEC 20071-11:2019 pdf free
ISO IEC 20071-11:2019 pdf free.Information technology一User interface component accessibility
Images are often used to convey a large amount of information, whether it is a diagram for constructing a desk or a photo of what happened at a birthday party. In one glance, a person can retrieve a large amount of information and have a general understanding about the remaining content in the document in which the image resides.
NOTE 1 While text alternatives are primarily developed for electronic documents (including computer applications, apps, and websites); they can also be helpful in printed documents that can be read out to a user.Images are sometimes used to supplement or complement the document content or can be another representation of the same content. However, sometimes the image stands alone or adds information that is not part of the other document content. Any information that is present in the image but not the other document content does not get conveyed to those who are unable to see the image. Text alternatives are needed to convey that information.
The information contained in well-written text alternatives can often help users who can see an image to understand or interpret the image as it was intended by the document developer. In situations where the information contained in a text alternative is considered beneficial to all (or most) users of a document, this information can be presented in the main body of text, either as part of the main text or in a special addition to the main text that is identified as acting as a text alternative to the image, rather than as alternative text attribute of the image that requires special efforts to access.
Where text alternatives are included within the main body of text, they are not limited in length and can take one or more paragraphs to provide detailed descriptions of the image and detailed discussions of its intended purpose.ISO IEC 20071-11 pdf free download.
