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You can do it as, for example: "Density of soil (lb/ft<sup>3</sup>)". Enclosing the value with sup tags. However, it's not advisable to click again the label because doing so will remove the tags in it. That's the only possible way you can accomplish that.
For example: http://www.jotformpro.com/form/50403672866963.
If you want to add superscript text in a text box label :
1. Choose element on which you want to add superscript text
2. Go to your Form Builder
3. Select Sub Label option
4. Add text that you want to be superscript inside of <sup> </sup> tags and press OK
Hope this will help.
Fantastic, I didn't know you could use style tags in the labels. Whole new world of possibilities.
You can since we don't restrict it there. However, as I have mentioned, you should not click back the label since that will remove the tags. Otherwise, you will have to manually add it again.
Also, just to let you know that I have submitted a request to our developers about this matter. If there are updates about it, you should know it via this thread.