Prefix vendor for JS.

vendor.js

var vendor = function() {
    var vendors, i, len, style;

    vendors = ['', 'webkit', 'ms', 'Moz', 'O'];
    style   = document.createElement('div').style;

    len = vendors.length;
    for (i = 0; i < len; i += 1) {
        if ((vendors[i] + 'Transform') in style) {
            return vendors[i];
        }
    }

    return '';
}();