ANSI/NISO Z39.96-2015

10 Article Authoring Tag Set, version 1.1 • 10.5 Attributes

10.5.4 @alt Alternative Text

Word or phrase that serves as a textual alternative for the element.

In elements <abbrev>, <label>, <named-content>, <styled-content>, and <xref>, this attribute may be used if the element is used.
Value Meaning
Text, numbers, or special characters Simple textual words or phrases provided as a textual alternative to its element, for example, a phrase to be pronounced by screen readers.