Why when adding a new property to window, after refreshing the page, it does not disappear?

Question

laptops

I tested the function, I decided to windowadd a property name
After the function was deleted, I updated the page, but it window.nameremained

Answer 1

Mac is better. The system works more stable, more pleasant to work. I myself switched from Win to OsX and I do not regret it even once.

Answer 2

Any of these options will suit your tasks, so choose from personal feelings, come to the store and touch each one, if possible, then you will understand. I would choose a Macbook if I were you.

Answer 3

Because you chose the most unfortunate name for experiments. This property is already in window and is special.
https://developer.mozilla.org/en-US/docs/Web/API/W...