<hr> what dose in means?

Answer 1

It's HTML tag which stands for Hatsy Rei, it creates a cookie.

Answer 2

Here is an example.....👍
https://code.sololearn.com/WDsPwvjl8bis/?ref=app

Answer 3

it creates a horizontal line. go to code playground and try for yourself.

Answer 4

Just a mnemotechnic rule (which is the actual definition for <hr>, I guess): hr stands for Horizontal Rule.
Please see definition 4.1 of rule:
https://en.oxforddictionaries.com/definition/rule