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I wish to achieve following. There may be many variant of this.

marked as duplicate by AlexG, Jesse, Claudio Fiandrino, Guido, user13907 Aug 28 '14 at 12:24

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.


If PDF annotations are okay for you:

  \pdfmarkupcomment[color={ 0.3 0.3 0.3 },opacity=0]{\textbf{#1}}{#2}%
\callout{If}{If shows the cause ...} it can be detected ...


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