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Lightweight ES5 and DOM shim with IE6 and IE7 support
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ES5 and DOM4 shim for all browsers with IE6 and IE7 support

based on:

Status: Stable Beta Demo Try it in IE7 (or in IE6 ¬_¬)! And take a look at the source


  • Normalizing the JS and DOM across all browsers
  • Less code (eg less closures, reusable functions) & file size
  • IE6+ support
  • Include all we need from ES5, ES6 and DOM shim in one file
  • some extra stuff (if you don't need it, use a.noextras.js instead of a.js)

Caution !!!

  • This lib is not about performance in IE < 9
  • The requests should respond with the mime type "text/x-component"
  • That's all cautions


(Note: if you don't need EXSTRAs use a.noexstras.js instead of a.js)

  • For modern browsers: Add main script in head section

          <script src="a.js"></script>
  • For IE8 support:

    1. First[!] add a.ie8.js in head section

        <!--[if IE 8]>
        <script src="a.ie8.js"></script>
    2. Add a.js in head section

        <script src="a.js"></script>
  • For IE6 and IE7, and IE8 support:

    1. Add a.ie8.js and a.ielt8.js, a.js in head section

        <!--[if lt IE 8]>
        <script src="a.ielt8.js"></script>
        <!--[if IE 8]>
        <script src="a.ie8.js"></script>
        <script src="a.js"></script>
    2. Put to the root of your site


IF INCLUDE_EXTRAS == false -> broken Object.defineProperty will be deleted


  • Exporting these objects to global (window)
    1. browser
    2. Utils.Dom.DOMStringCollection
    3. XHR from with customisations
    4. (If where is no any other) $(selector, root) alias for root.querySelector(selector) (with ">[any selector]" support)
    5. $$(selector, root) alias for root.querySelectorAll(selector) (with ">[any selector]" support)
    6. $$0 alias for $
  • Extending objects
    1. Object.append(object, donor, [donor2, ...])
    2. Object.extend(object, donor, [donor2, ...]) (Object.append with overwrite exists properties)
    3. Object.inherit(Child, Parent)
    4. Array.prototype.unique()
    5. String.random(length)
  • Extra polyfills
    1. 'reversed' for
        with DOM API
      1. HTML*Element.labels
      2. HTMLLabelElement.control


Same-domain limitation

IE requires that the .htc behavior file must be in the same domain as the HTML page which uses it. If you try to load the behavior from a different domain, you will get an "Access Denied" error. Note that the domain must be exactly the same; that means that is a different domain than

Solve Same-domain limitation

Russian instruction in extra/SameDomainLimitation.SOLVE_RUS.odt

Temporary testing

Known issues:

  1. Lack of test cases
  2. Same-domain limitation (can be solve only on server)
  3. Incompatibility with [working on it]


  1. Tests
  2. ( &


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