Snippets in header not working

Trying to alter page transition to a vertical swipe, left to right.

Have put the following snippet in the header:

<META http-equiv="Page-Enter" Content="RevealTrans(Duration=3.0,Transition=6)">
<META http-equiv="Page-Exit" Content="RevealTrans(Duration=1.0,Transition=6)">

But it just ain't working. Can anyone help?

Much obliged my friends,