custom cursor

After seeing the zoom-in and zoom-out cursor on Weibo, I thought about how to make one myself.
The most commonly used method:
cursor: url(css/cur/big.cur), auto;
Weibo also does the same.
However, it is found that CSS3 has its own
cursor: zoom-in
cursor: zoom-out
these two experimental features
It is recommended to use cursor in the production environment: url(css/cur/big.cur), auto;