Thread:Help talk:Adding tooltips/How do we implement it ?/reply

It does work in preview as well [0] but if for some reason you have an extension that use JS differently as shown here [1] then JS execution is blocked which is a prerequisite for [0] being successful.

As in [1], find the malefactor, correct the JS, and you should be able to see that it works in [0] as well.

[0] https://cloud.githubusercontent.com/assets/1245473/8588835/3bd92446-260f-11e5-8eed-ba6b8437ae37.png

[1] https://cloud.githubusercontent.com/assets/1245473/8588856/900221bc-260f-11e5-9d0f-f096a911b950.png