/*! HTML5 Shiv vpre3.6 | @afarkas @jdalton @jon_neal @rem | MIT/GPL2 Licensed */
;(function(window, document) {

  /** Preset options */
  var options = window.html5 || {};

  /** Used to skip problem elements */
  var reSkip = /^<|^(?:button|form|map|select|textarea|object|iframe|option|optgroup)$/i;

  /** Not all elements can be cloned in IE (this list can be shortend) **/
  var saveClones = /^<|^(?:a|b|button|code|div|fieldset|form|h1|h2|h3|h4|h5|h6|i|iframe|img|input|label|li|link|ol|option|p|param|q|script|select|span|strong|style|table|tbody|td|textarea|tfoot|th|thead|tr|ul)$/i;

  /** Detect whether the browser supports default html5 styles */
  var supportsHtml5Styles;

  /** Detect whether the browser supports unknown elements */
  var supportsUnknownElements;

  (function() {
    var a = document.createElement('a');

    a.innerHTML = '<xyz></xyz>';

    //if the hidden property is implemented we can assume, that the browser supports HTML5 Styles | this fails in Chrome 8
    supportsHtml5Styles = ('hidden' in a);
    //if we are part of Modernizr, we do an additional test to solve the Chrome 8 fail
    if(supportsHtml5Styles && typeof injectElementWithStyles == 'function'){
        injectElementWithStyles('#modernizr{}', function(node){
            node.hidden = true;
            supportsHtml5Styles = (window.getComputedStyle ?
                  getComputedStyle(node, null) :
                  node.currentStyle).display == 'none';
        });
    }

    supportsUnknownElements = a.childNodes.length == 1 || (function() {
      // assign a false positive if unable to shiv
      try {
        (document.createElement)('a');
      } catch(e) {
        return true;
      }
      var frag = document.createDocumentFragment();
      return (
        typeof frag.cloneNode == 'undefined' ||
        typeof frag.createDocumentFragment == 'undefined' ||
        typeof frag.createElement == 'undefined'
      );
    }());

  }());

  /*--------------------------------------------------------------------------*/

  /**
   * Creates a style sheet with the given CSS text and adds it to the document.
   * @private
   * @param {Document} ownerDocument The document.
   * @param {String} cssText The CSS text.
   * @returns {StyleSheet} The style element.
   */
  function addStyleSheet(ownerDocument, cssText) {
    var p = ownerDocument.createElement('p'),
        parent = ownerDocument.getElementsByTagName('head')[0] || ownerDocument.documentElement;

    p.innerHTML = 'x<style>' + cssText + '</style>';
    return parent.insertBefore(p.lastChild, parent.firstChild);
  }

  /**
   * Returns the value of `html5.elements` as an array.
   * @private
   * @returns {Array} An array of shived element node names.
   */
  function getElements() {
    var elements = html5.elements;
    return typeof elements == 'string' ? elements.split(' ') : elements;
  }

  /**
   * Shivs the `createElement` and `createDocumentFragment` methods of the document.
   * @private
   * @param {Document|DocumentFragment} ownerDocument The document.
   */
  function shivMethods(ownerDocument) {
    var cache = {},
        docCreateElement = ownerDocument.createElement,
        docCreateFragment = ownerDocument.createDocumentFragment,
        frag = docCreateFragment();

    ownerDocument.createElement = function(nodeName) {
      //abort shiv
      if(!html5.shivMethods){
          return docCreateElement(nodeName);
      }

      var node;
      
      if(cache[nodeName]){
          node = cache[nodeName].cloneNode();
      } else if(saveClones.test(nodeName)){
           node = (cache[nodeName] = docCreateElement(nodeName)).cloneNode();
      } else {
          node = docCreateElement(nodeName);
      }

      // Avoid adding some elements to fragments in IE < 9 because
      // * Attributes like `name` or `type` cannot be set/changed once an element
      //   is inserted into a document/fragment
      // * Link elements with `src` attributes that are inaccessible, as with
      //   a 403 response, will cause the tab/window to crash
      // * Script elements appended to fragments will execute when their `src`
      //   or `text` property is set

      return node.canHaveChildren && !reSkip.test(nodeName) ? frag.appendChild(node) : node;
    };

    ownerDocument.createDocumentFragment = Function('h,f', 'return function(){' +
      'var n=f.cloneNode(),c=n.createElement;' +
      'h.shivMethods&&(' +
        // unroll the `createElement` calls
        getElements().join().replace(/\w+/g, function(nodeName) {
          docCreateElement(nodeName);
          frag.createElement(nodeName);
          return 'c("' + nodeName + '")';
        }) +
      ');return n}'
    )(html5, frag);
  }

  /*--------------------------------------------------------------------------*/

  /**
   * Shivs the given document.
   * @memberOf html5
   * @param {Document} ownerDocument The document to shiv.
   * @returns {Document} The shived document.
   */
  function shivDocument(ownerDocument) {
    var shived;
    if (ownerDocument.documentShived) {
      return ownerDocument;
    }
    if (html5.shivCSS && !supportsHtml5Styles) {
      shived = !!addStyleSheet(ownerDocument,
        // corrects block display not defined in IE6/7/8/9
        'article,aside,details,figcaption,figure,footer,header,hgroup,nav,section{display:block}' +
        // corrects audio display not defined in IE6/7/8/9
        'audio{display:none}' +
        // corrects canvas and video display not defined in IE6/7/8/9
        'canvas,video{display:inline-block;*display:inline;*zoom:1}' +
        // corrects 'hidden' attribute and audio[controls] display not present in IE7/8/9
        '[hidden]{display:none}audio[controls]{display:inline-block;*display:inline;*zoom:1}' +
        // adds styling not present in IE6/7/8/9
        'mark{background:#FF0;color:#000}'
      );
    }
    if (!supportsUnknownElements) {
      shived = !shivMethods(ownerDocument);
    }
    if (shived) {
      ownerDocument.documentShived = shived;
    }
    return ownerDocument;
  }

  /*--------------------------------------------------------------------------*/

  /**
   * The `html5` object is exposed so that more elements can be shived and
   * existing shiving can be detected on iframes.
   * @type Object
   * @example
   *
   * // options can be changed before the script is included
   * html5 = { 'elements': 'mark section', 'shivCSS': false, 'shivMethods': false };
   */
  var html5 = {

    /**
     * An array or space separated string of node names of the elements to shiv.
     * @memberOf html5
     * @type Array|String
     */
    'elements': options.elements || 'abbr article aside audio bdi canvas data datalist details figcaption figure footer header hgroup mark meter nav output progress section summary time video',

    /**
     * A flag to indicate that the HTML5 style sheet should be inserted.
     * @memberOf html5
     * @type Boolean
     */
    'shivCSS': !(options.shivCSS === false),

    /**
     * A flag to indicate that the document's `createElement` and `createDocumentFragment`
     * methods should be overwritten.
     * @memberOf html5
     * @type Boolean
     */
    'shivMethods': !(options.shivMethods === false),

    /**
     * A string to describe the type of `html5` object ("default" or "default print").
     * @memberOf html5
     * @type String
     */
    'type': 'default',

    // shivs the document according to the specified `html5` object options
    'shivDocument': shivDocument
  };

  /*--------------------------------------------------------------------------*/

  // expose html5
  window.html5 = html5;

  // shiv the document
  shivDocument(document);

  /*------------------------------- Print Shiv -------------------------------*/

  /** Used to filter media types */
  var reMedia = /^$|\b(?:all|print)\b/;

  /** Used to namespace printable elements */
  var shivNamespace = 'html5shiv';

  /** Detect whether the browser supports shivable style sheets */
  var supportsShivableSheets = !supportsUnknownElements && (function() {
    // assign a false negative if unable to shiv
    var docEl = document.documentElement;
    return !(
      typeof document.namespaces == 'undefined' ||
      typeof document.parentWindow == 'undefined' ||
      typeof docEl.applyElement == 'undefined' ||
      typeof docEl.removeNode == 'undefined' ||
      typeof window.attachEvent == 'undefined'
    );
  }());

  /*--------------------------------------------------------------------------*/

  /**
   * Wraps all HTML5 elements in the given document with printable elements.
   * (eg. the "header" element is wrapped with the "html5shiv:header" element)
   * @private
   * @param {Document} ownerDocument The document.
   * @returns {Array} An array wrappers added.
   */
  function addWrappers(ownerDocument) {
    var node,
        nodes = ownerDocument.getElementsByTagName('*'),
        index = nodes.length,
        reElements = RegExp('^(?:' + getElements().join('|') + ')$', 'i'),
        result = [];

    while (index--) {
      node = nodes[index];
      if (reElements.test(node.nodeName)) {
        result.push(node.applyElement(createWrapper(node)));
      }
    }
    return result;
  }

  /**
   * Creates a printable wrapper for the given element.
   * @private
   * @param {Element} element The element.
   * @returns {Element} The wrapper.
   */
  function createWrapper(element) {
    var node,
        nodes = element.attributes,
        index = nodes.length,
        wrapper = element.ownerDocument.createElement(shivNamespace + ':' + element.nodeName);

    // copy element attributes to the wrapper
    while (index--) {
      node = nodes[index];
      node.specified && wrapper.setAttribute(node.nodeName, node.nodeValue);
    }
    // copy element styles to the wrapper
    wrapper.style.cssText = element.style.cssText;
    return wrapper;
  }

  /**
   * Shivs the given CSS text.
   * (eg. header{} becomes html5shiv\:header{})
   * @private
   * @param {String} cssText The CSS text to shiv.
   * @returns {String} The shived CSS text.
   */
  function shivCssText(cssText) {
    var pair,
        parts = cssText.split('{'),
        index = parts.length,
        reElements = RegExp('(^|[\\s,>+~])(' + getElements().join('|') + ')(?=[[\\s,>+~#.:]|$)', 'gi'),
        replacement = '$1' + shivNamespace + '\\:$2';

    while (index--) {
      pair = parts[index] = parts[index].split('}');
      pair[pair.length - 1] = pair[pair.length - 1].replace(reElements, replacement);
      parts[index] = pair.join('}');
    }
    return parts.join('{');
  }

  /**
   * Removes the given wrappers, leaving the original elements.
   * @private
   * @params {Array} wrappers An array of printable wrappers.
   */
  function removeWrappers(wrappers) {
    var index = wrappers.length;
    while (index--) {
      wrappers[index].removeNode();
    }
  }

  /*--------------------------------------------------------------------------*/

  /**
   * Shivs the given document for print.
   * @memberOf html5
   * @param {Document} ownerDocument The document to shiv.
   * @returns {Document} The shived document.
   */
  function shivPrint(ownerDocument) {
    var shivedSheet,
        wrappers,
        namespaces = ownerDocument.namespaces,
        ownerWindow = ownerDocument.parentWindow;

    if (!supportsShivableSheets || ownerDocument.printShived) {
      return ownerDocument;
    }
    if (typeof namespaces[shivNamespace] == 'undefined') {
      namespaces.add(shivNamespace);
    }

    ownerWindow.attachEvent('onbeforeprint', function() {
      var imports,
          length,
          sheet,
          collection = ownerDocument.styleSheets,
          cssText = [],
          index = collection.length,
          sheets = Array(index);

      // convert styleSheets collection to an array
      while (index--) {
        sheets[index] = collection[index];
      }
      // concat all style sheet CSS text
      while ((sheet = sheets.pop())) {
        // IE does not enforce a same origin policy for external style sheets...
        // but has trouble with some dynamically created stylesheets
        if (!sheet.disabled && reMedia.test(sheet.media)) {

          try {
            imports = sheet.imports;
            length = imports.length;
          } catch(er){
            length = 0;
          }

          for (index = 0; index < length; index++) {
            sheets.push(imports[index]);
          }

          try {
            cssText.push(sheet.cssText);
          } catch(er){}
        }
      }
      // wrap all HTML5 elements with printable elements and add the shived style sheet
      cssText = shivCssText(cssText.reverse().join(''));
      wrappers = addWrappers(ownerDocument);
      shivedSheet = addStyleSheet(ownerDocument, cssText);
    });

    ownerWindow.attachEvent('onafterprint', function() {
      // remove wrappers, leaving the original elements, and remove the shived style sheet
      removeWrappers(wrappers);
      shivedSheet.removeNode(true);
    });

    ownerDocument.printShived = true;
    return ownerDocument;
  }

  /*--------------------------------------------------------------------------*/

  // expose API
  html5.type += ' print';
  html5.shivPrint = shivPrint;

  // shiv for print
  shivPrint(document);

}(this, document));