Rule ID 
Image 7 
Definition 
Mathematical expressions must be marked up using MathML instead of bitmapped images. 
Purpose 
 Images used to convey mathematical expressions are not accessible to people with disabilities using assistive technologies.
 MathML is a W3C standard for representing mathematical expressions for web technologies and is the most accessible web math format for people using assistive technologies.
 MathML has capabilities similar to SVG graphics, providing the abilities to resize and style content without the loss of fidelity of the visual rendering to match the capabilities of people with visual impairments.

Required 
Yes for HTML4 Legacy Techniques ruleset mapping 
WCAG Success Criteria 
1.1.1 Nontext Content (Level A, Primary Success Criterion)
Other Related Success Criterion:

Rule Category 
Images 
Scope 
Element 
Target Resources 
img and [role="img"] elements representing mathematical expressions

Techniques 
 Use MathML to represent the mathematical expressions.
 Use MathJax to support MathML rendering in a wide range of browsers with and without native support for rendering MathML.
 Design Science MathPlayer is a universal math reader that now enables math to be spoken in many assistive technology products.

Informational Links 
