Sub and superscript in PPT online

You can apply sub- or superscript in PPT online. In fact it works the same as in PPT for the desktop.

Either use the buttons on the Home tab of the ribbon, you can find them in the Font group. Select the text to be displayed in sub or superscript and click the button.

If you want to use the keyboard the shortcuts are:

Ctrl+shift+ +key to apply superscript and Ctrl+shift+-key to apply subscript.