In the good spirit of testing capabilities rather than browser versions, I needed a way to find out whether or not a browser supports setting the values of the “outline” property via CSS. IE6 and 7 don’t support it, everything else seems to. So I just quickly extended the jQuery.support functionality like so:

$.support.outlineCss = function() {
    var $el = $("<div></div>").css("outline", "1px solid black"),
        outlineStyle = $el.appendTo(document.body).css("outline-style");
    $el.remove();
    return outlineStyle == "solid";
}();

Simply test if $.support.outlineCss is true and you’re good to go…