How to detect page zoom level in all modern browsers?

Question

1. How can I detect the page zoom level in all modern browsers? While this thread tells how to do it in IE7 and IE8, I can\'t find a good cross-browser solution.

Answer 1

@media (min-width: 500px){
/* css here */
}

or

@media (max-width: 500px){
/* css here */
}