Page-Enter determines which filter to apply when opening the page;
Page-Exit determines which filter to apply when leaving the page;
_ is one of the filters with parameters. The full list of filters can be viewed in msdn;
( ); Such meta tags work only in IE; It is not necessary to insert both Page-Enter and Page-Exit . You can both, and you can only one of them. Watching what you want to achieve. Links to external css-files must be defined after the meta tags. Meta tags are generally better to insert immediately after the opening tag. ')
I want to note that you need to use such transitions wisely. I agree that at first glance they are pretty attractive, but with unwise use they can be very, very irritable. I do not recommend using large values for the duration of transitions or use different filters for one site.
And yet, no one will forbid you to add attractiveness and uniqueness to your resource. Good luck!