<hr> what dose in means?
It's HTML tag which stands for Hatsy Rei, it creates a cookie.
Here is an example.....👍 https://code.sololearn.com/WDsPwvjl8bis/?ref=app
it creates a horizontal line. go to code playground and try for yourself.
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