Check if a browser supports a feature

supports

function supports ( prop ) {

    var div = document.createElement( 'div' ),
        vendors = 'Khtml Ms O Moz Webkit'.split( ' ' ),
        len = vendors.length;

    if ( prop in div.style ) {
        return true;
    }


    prop = prop.replace( /^[a-z]/, function ( val ) {
        return val.toUpperCase();
    } );

    while ( len-- ) {
        if ( vendors[ len ] + prop in div.style ) {
            // browser supports box-shadow. Do what you need.
            // Or use a bang (!) to test if the browser doesn't.
            return true;
        }
    }

    return false;

}