jQuery Sandbox

jquery.sandbox.js

$.fn.sandbox = function(fn) {
    var element = $(this).clone(), result;
    // make the element take space in the page but invisible
    element.css({visibility: 'hidden', display: 'block'}).insertAfter(this);
    // to override any display: none !important you may have been using
    element.attr('style', element.attr('style').replace('block', 'block !important'));
    result = fn.apply(element);
    element.remove();
    return result;
};