Exponents in the image alt tag

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Hi Caroline, I found some good suggestions here: html - How to show text as a superscript in "Alt text"? - Stack Overflow

for the sake of readability, you might just want to do something like 10^1234

Use value^10 if it means “to-the-10th-power”, use something like value[10] or value (see #10) if it means “see footnote #10”. Remember alt-text is used when the image is not available, and should provide semantics not typographical features