Hi,
Sorry if I'm completely wrong but I'd suggest to add to the core the 
following "supports" (If you think they are interesting for everyone):

jQuery.support = {
    ....
    // check if expressions exists (for IE7- and IE8, not in standard 
IE8 mode...) so programatically and "optimally"
    // you could add wc3 css standard behaviors not implemented in IEs...
    expression : typeof div.style.setExpression !== "undefined",
  
    // check if the browser supports "border-radius": return null (or 
false) if not....
    // but if true, then return the css prefix to add to standard: "", 
"-moz-", "-webkit-" + "border-radius"
    // This kind of check is used a lot in plugins, and I think this is 
the fastest/easiest way...
    borderRadius : (typeof div.style.borderRadius !== "undefined") ? "" 
: (typeof div.style.WebkitBorderRadius !== "undefined") ? "-webkit-" :  
(typeof div.style.MozBorderRadius !== "undefined") ? "-moz-" :  null;
    ....
}

Now I'm using functions like this:

    function hasBorderRadius(){
        var d = document.createElement("div").style;
        if (typeof d.borderRadius !== "undefined") return "";
        if (typeof d.WebkitBorderRadius !== "undefined") return "-webkit-";
        if (typeof d.MozBorderRadius !== "undefined") return "-moz-";
        return null;
    };
    function hasSetExpression(){
        var d = document.createElement("div").style;
        return typeof d.setExpression !== "undefined";
    }

, thanks a lot

-- 
Enrique Meléndez Estrada (976 01 0083)
Dpto. Servicios Informáticos
Área Organización y Servicios Internos
INSTITUTO TECNOLÓGICO DE ARAGÓN
c/ María de Luna 8, 50018, Zaragoza (Spain)
emelen...@ita.es - http://www.ita.es

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