TIL about H₃O⁺ + OH⁻ (superscripts + subscripts)

A presentation at Tech Talk @ Tagesspiegel by Gunnar Bittersmann

  • Unicode block Superscripts and Subscripts
  • accessibility concerns: some screen readers don’t announce superscript and subscript characters
  • HTML elements sup and sub
  • OpenType features sups and subs and their usage in CSS


The following code examples from the presentation can be tried out live.


The following resources were mentioned during the presentation or are useful additional information.