IE document.querySelector() polyfill

querySelector.polyfill.js

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);

    while (document._qsa.length) {
      element = document._qsa.shift();
      element.style.removeAttribute('x-qsa');
      elements.push(element);
    }
    document._qsa = null;
    return elements;
  };
}

if (!document.querySelector) {
  document.querySelector = function (selectors) {
    var elements = document.querySelectorAll(selectors);
    return (elements.length) ? elements[0] : null;
  };
}

I think you can add ".call(this));" to the end of the function and replace document with "this.document" and window with "this"

What license is this polyfill available as? MIT?
Would like to use it as part of a commercial project. Thanks in advance!

@chrisjlee Now the source you mentioned is at https://github.com/inexorabletash/polyfill/blob/master/polyfill.js#L4599

What's that window.scrollby doing in there? Just curious because it doesn't seem to contribute anything...

@Peppester I'm not sure, but it is probably something that makes the css engine refresh and recompute the rules or something like that I would guess...

What's that window.scrollby doing in there? Just curious because it doesn't seem to contribute anything...

And also scrollBy does not work in IE