Doing what's required: Indicating mandatory fields in an accessible way - TPGi
Briefly

The most unambiguous way to indicate information that users need to provide is to include the text “required” or “mandatory” in the form field's visible text label.
Yet with or without such an explanation, asterisks provide a very visual solution and can be less meaningful to screen reader users, who must listen out for the ambiguous word “star.”
Read at TPGi
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