How to make such a placeholder?

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Blackmilk42018-06-26 17:14:10

JavaScript

Blackmilk4, 2018-06-26 17:14:10

Interested in how to do this; when entering the account, and as soon as the focus on the form is made, the placeholder becomes smaller and is removed to the top as on this site https://esia.gosuslugi.ru/idp/rlogin?cc=bp

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sinistra17, 2018-06-26
@Blackmilk4

3 minute googling brings us to this solution , implemented here