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Social Security Administration Guide: Alternate text for images (2010) https://www.ssa.gov/accessibility/files/SSA_Altern... (4.3 MB)
Mathematical symbols, calculations, equations
- Penn State Guidance for accessible equations (including LaTeX guidance): https://accessibility.psu.edu/math/equations/
- Michigan DOT guidance handout (11 pages): https://www.michigan.gov/documents/mdot/MDOT-Research-Accessibility-Guidelines_658743_7.pdf
Mathspeak (examples of shorthand for use in alt-text): https://www.seewritehear.com/accessible-mathml/mathspeak/examples/quick-tutorial/index.php?verbosity=b&explicitness=0&interp=all
Tip For complex equations that include matrices, layout, nested fractions, etc., It could be helpful to review samples the MathSpeak super-brief semantics to incorporate shorthand alt-text like
"StartFrac"/"EndFrac" bookends for identifying complex fractions https://www.seewritehear.com/accessible-mathml/mathspeak/examples/grammar-rules/?rule=fractions&description=Fractions&id=7
"StartRoot"/"EndRoot" bookends for identifying square root calculations https://www.seewritehear.com/accessible-mathml/mathspeak/examples/grammar-rules/?rule=radicals&description=Radicals&id=9
"l-par"/"r-par" or "l-brace"/"r-brace" for left- and right-parentheses or left- and right-braces
"StartSet"/"EndSet"
"Sub"/"Base" and "Sup"/"Base" for identifying the beginning and end of complex subscripts and superscripts, and "SupSup" to identify a superscript within a superscript: https://www.seewritehear.com/accessible-mathml/mathspeak/examples/grammar-rules/?rule=scripts&description=Superscripts%20and%20Subscripts&id=8
"ModAbove"/"With" and "ModBelow"/"With" to indicate modifiers: https://www.seewritehear.com/accessible-mathml/mathspeak/examples/grammar-rules/?rule=stacked&description=Modifiers%20and%20Stacked%20Expressions&id=11
- Describing Matrices and binomials: https://www.seewritehear.com/accessible-mathml/mathspeak/examples/grammar-rules/?rule=linearalg&description=Linear%20Algebra&id=15
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