BR0kEN-

/**
 * __defineGetter__ - IE9+
 * new Error - IE10+
 */

window.__defineGetter__('__FILE__', function() {
  return (new Error).stack.split('/').slice(-1).join().split('.')[0];
});

console.log(__FILE__); // js_filename

BR0kEN-

if (!document.querySelectorAll) {
  document.querySelectorAll = function (selectors) {
    var style = document.createElement('style'), elements = [], element;
    document.documentElement.firstChild.appendChild(style);
    document._qsa = [];

    style.styleSheet.cssText = selectors + '{x-qsa:expression(document._qsa && document._qsa.push(this))}';
    window.scrollBy(0, 0);
    style.parentNode.removeChild(style);