Subscript and superscript (subsup)

Scientific and mathematical expressions must be marked so that subscripts and superscripts are programmatically exposed—e.g. using <sub>/<sup> elements or equivalent semantic markup (such as MathML).


Missing sub in scientific expression:

This paragraph has a scientific expression that lacks a proper <sub> element:


Almost every developer's favorite molecule is C8H10N4O2, also known as "caffeine."

Note: Impossible to automatically test or detect. Requires a human tester or AI to determine is a <sub> element is necessary.

axe detected: none  |  QualWeb detected: none