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To add superscript and subscript buttons to CKEditor in ProcessWire, go to your field and click the Input tab. Under CKEditor Settings > CKEditor Toolbar swap this line:

Format, Styles, -, Bold, Italic, -, RemoveFormat

For this:

Format, Styles, -, Bold, Italic, -, Superscript, Subscript, -, RemoveFormat

Tim Bennett is a web designer and developer. He has a First Class Honours degree in Computing from Leeds Metropolitan University and currently runs his own one-man web design company, Texelate.