Ever wonder why browser vendors dis-like bad feature detection (in this case I'd argue this is browser detection)? Well this is why. Vendor prefix sniffing that ends up assuming support of one vendor prefix means all properties are implemented that way. First, nearly all of the vendor prefixed properties appear very late in the enumeration, so y…

evil_vendor_prefix.js

<script>
var r = {};
r.VENDOR_PREFIX = function () {
    var e = /^(Webkit|Khtml|Moz|ms|O)(?=[A-Z])/, t = document.getElementsByTagName("script")[0].style, n;
    for (n in t)
        if (e.test(n))
            return n.match(e)[0].toLowerCase();
    return "WebkitOpacity" in t ? "webkit" : "KhtmlOpacity" in t ? "khtml" : "";
}();
</script>