See documentation for the Mathematical Markup Language (MathML) 2.0 DTD.
The alttext is used only within mathematical expressions. The equivalent function, providing words that can be display “behind” a graphic or be pronounced over a graphic, is performed by the <alt-text> element for graphics (and other elements) within this DTD.
Value | Meaning |
---|---|
Text, numbers, or special characters | See MathML documentation. |
Restriction: This attribute may be specified if the element is used. |