The CSS hooks API was introduced to give developers the ability to get and set particular CSS values. Using it, you can hide browser specific implementations and expose a unified interface for accessing particular properties.
$.cssHooks['borderRadius'] = {
get: function(elem, computed, extra){
// Depending on the browser, read the value of
// -moz-border-radius, -webkit-border-radius or border-radius
},
set: function(elem, value){
// Set the appropriate CSS3 property
}
};
Use it without worrying which property the browser actually understands:
$('#rect').css('borderRadius',5);