[Javascript] Silly question

[coboalvaro at gmail.com (Alvaro Cobo)]

Hi guys: 

Very simple question: I just need to know what is the name of this kind of big yellow post-it whith information about the link which appears when you put the mouse over a link or a text. 

Sorry for such a silly question, but It is quite impossible to find it googling without knowing the name. 

Thanks a lot, 

Alvaro. 
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