Definition
Textual descriptions of math equations are included, whether in the alt attribute for image-based equations, using the alttext attribute for [MathML] equations, or by other means.
Examples
<meta property="schema:accessibilityFeature">
describedMath
</meta>
<meta name="schema:accessibilityFeature"
content="describedMath"/>
"accessibilityFeature": ["describedMath"]
Explanation
The describedMath
value is used to indicate that a publication includes textual descriptions for math
equations.
Text descriptions can be provided, for example, using language-specific technologies like the
MathML alttext
attribute. They can also be provided using the HTML
alt
attribute when only images are used. The value is a human readable
equivalent.
Math description provided in an alttext
attribute.
<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"
alttext="(mathml alt-text): y minus y 1 equals StartFraction y 2 minus y 1 Over x 2 minus x 1 EndFraction left-parenthesis x minus x 1 right-parenthesis">
This property is complementary to the MathML
and latex
properties, as the inclusion of either MathML- or
latex-formatted equations does not infer that text descriptions will be available.
Related Links
- Schema.org — accessibilityFeature
- Schema.org Accessibility Vocabulary — describedMath