Modernizr Test Suite

JavaScript performance comparison

Revision 5 of this test case created by Kyle Simpson

Info

Testing how long the feature testing in Modernizr takes (63 tests).

uses the development version of moderniz

Preparation code

<script>
  Benchmark.prototype.MAX_TIME_ELAPSED = 15;
</script>

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Testing in unknown unknown
Test Ops/sec
Modernizr
/*!
 * Modernizr v2.6.1
 * www.modernizr.com
 *
 * Copyright (c) Faruk Ates, Paul Irish, Alex Sexton
 * Available under the BSD and MIT licenses: www.modernizr.com/license/
 */


/*
 * Modernizr tests which native CSS3 and HTML5 features are available in
 * the current UA and makes the results available to you in two ways:
 * as properties on a global Modernizr object, and as classes on the
 * <html> element. This information allows you to progressively enhance
 * your pages with a granular level of control over the experience.
 *
 * Modernizr has an optional (not included) conditional resource loader
 * called Modernizr.load(), based on Yepnope.js (yepnopejs.com).
 * To get a build that includes Modernizr.load(), as well as choosing
 * which tests to include, go to www.modernizr.com/download/
 *
 * Authors        Faruk Ates, Paul Irish, Alex Sexton
 * Contributors   Ryan Seddon, Ben Alman
 */


window.Modernizr = (function(window, document, undefined) {

  var version = '2.6.1',
     
     
     
      Modernizr = {},
     
     
     
       /*>>cssclasses*/
     
     
     
     
     
      // option for enabling the HTML classes to be added
      enableClasses = true,
       /*>>cssclasses*/
     
     
     
     
     
      docElement = document.documentElement,
     
     
     
     
     
      /**
       * Create our "modernizr" element that we do most feature tests on.
       */

     
     
     
      mod = 'modernizr',
      modElem = document.createElement(mod),
      mStyle = modElem.style,
     
     
     
     
     
      /**
       * Create the input element for various Web Forms feature tests.
       */

     
     
     
      inputElem /*>>inputelem*/
       = document.createElement('input') /*>>inputelem*/
      ,
     
     
     
       /*>>smile*/
     
     
     
      smile = ':)',
       /*>>smile*/
     
     
     
     
     
      toString = {}.toString,
     
     
     
     
     
     
     
      // TODO :: make the prefixes more granular
       /*>>prefixes*/
     
     
     
     
     
      // List of property values to set for css tests. See ticket #21
      prefixes = ' -webkit- -moz- -o- -ms- '.split(' '),
       /*>>prefixes*/
     
     
     
       /*>>domprefixes*/
     
     
     
     
     
      // Following spec is to expose vendor-specific style properties as:
       //   elem.style.WebkitBorderRadius
       // and the following would be incorrect:
       //   elem.style.webkitBorderRadius
     
     
     
     
      // Webkit ghosts their properties in lowercase but Opera & Moz do not.
       // Microsoft uses a lowercase `ms` instead of the correct `Ms` in IE8+
       //   erik.eae.net/archives/2008/03/10/21.48.10/
     
     
     
     
      // More here: github.com/Modernizr/Modernizr/issues/issue/21
      omPrefixes = 'Webkit Moz O ms',
     
     
     
      cssomPrefixes = omPrefixes.split(' '),
     
     
     
      domPrefixes = omPrefixes.toLowerCase().split(' '),
       /*>>domprefixes*/
     
     
     
       /*>>ns*/
     
     
     
      ns = {
      'svg': 'http://www.w3.org/2000/svg'
      },
       /*>>ns*/
     
     
     
     
     
      tests = {},
      inputs = {},
      attrs = {},
     
     
     
      classes = [],
     
     
     
      slice = classes.slice,
     
     
     
      featureName, // used in testing loop
     
     
       /*>>teststyles*/
     
     
     
     
     
      // Inject element with style element and some CSS rules
      injectElementWithStyles = function(rule, callback, nodes, testnames) {

      var style, ret, node, div = document.createElement('div'),
         
         
         
         
         
          // After page load injecting a fake body doesn't work so check if body exists
          body = document.body,
         
         
         
         
         
          // IE6 and 7 won't return offsetWidth or offsetHeight unless it's in the body element, so we fake it.
          fakeBody = body ? body : document.createElement('body');

      if (parseInt(nodes, 10)) {
        // In order not to give false positives we create a node for each test
        // This also allows the method to scale for unspecified uses
        while (nodes--) {
          node = document.createElement('div');
          node.id = testnames ? testnames[nodes] : mod + (nodes + 1);
          div.appendChild(node);
        }
      }

      // <style> elements in IE6-9 are considered 'NoScope' elements and therefore will be removed
      // when injected with innerHTML. To get around this you need to prepend the 'NoScope' element
      // with a 'scoped' element, in our case the soft-hyphen entity as it won't mess with our measurements.
      // msdn.microsoft.com/en-us/library/ms533897%28VS.85%29.aspx
      // Documents served as xml will throw if using &shy; so use xml friendly encoded version. See issue #277
      style = ['&#173;', '<style id="s', mod, '">', rule, '</style>'].join('');
      div.id = mod;
      // IE6 will false positive on some tests due to the style element inside the test div somehow interfering offsetHeight, so insert it into body or fakebody.
      // Opera will act all quirky when injecting elements in documentElement when page is served as xml, needs fakebody too. #270
      (body ? div : fakeBody).innerHTML += style;
      fakeBody.appendChild(div);
      if (!body) {
        //avoid crashing IE8, if background image is used
        fakeBody.style.background = "";
        docElement.appendChild(fakeBody);
      }

      ret = callback(div, rule);
      // If this is done after page load we don't want to remove the body so check if body exists
      !body ? fakeBody.parentNode.removeChild(fakeBody) : div.parentNode.removeChild(div);

      return !!ret;

      },
       /*>>teststyles*/
     
     
     
       /*>>mq*/
     
     
     
     
     
      // adapted from matchMedia polyfill
       // by Scott Jehl and Paul Irish
       // gist.github.com/786768
      testMediaQuery = function(mq) {

      var matchMedia = window.matchMedia || window.msMatchMedia;
      if (matchMedia) {
        return matchMedia(mq).matches;
      }

      var bool;

      injectElementWithStyles('@media ' + mq + ' { #' + mod + ' { position: absolute; } }', function(node) {
        bool = (window.getComputedStyle ? getComputedStyle(node, null) : node.currentStyle)['position'] == 'absolute';
      });

      return bool;

      },
       /*>>mq*/
     
     
     
     
       /*>>hasevent*/
     
     
     
     
     
      //
       // isEventSupported determines if a given element supports the given event
       // kangax.github.com/iseventsupported/
       //
       // The following results are known incorrects:
       //   Modernizr.hasEvent("webkitTransitionEnd", elem) // false negative
       //   Modernizr.hasEvent("textInput") // in Webkit. github.com/Modernizr/Modernizr/issues/333
       //   ...
      isEventSupported = (function() {

      var TAGNAMES = {
        'select': 'input',
        'change': 'input',
        'submit': 'form',
        'reset': 'form',
        'error': 'img',
        'load': 'img',
        'abort': 'img'
      };

      function isEventSupported(eventName, element) {

        element = element || document.createElement(TAGNAMES[eventName] || 'div');
        eventName = 'on' + eventName;

        // When using `setAttribute`, IE skips "unload", WebKit skips "unload" and "resize", whereas `in` "catches" those
        var isSupported = eventName in element;

        if (!isSupported) {
          // If it has no `setAttribute` (i.e. doesn't implement Node interface), try generic element
          if (!element.setAttribute) {
            element = document.createElement('div');
          }
          if (element.setAttribute && element.removeAttribute) {
            element.setAttribute(eventName, '');
            isSupported = is(element[eventName], 'function');

            // If property was created, "remove it" (by setting value to `undefined`)
            if (!is(element[eventName], 'undefined')) {
              element[eventName] = undefined;
            }
            element.removeAttribute(eventName);
          }
        }

        element = null;
        return isSupported;
      }
      return isEventSupported;
    })(),
       /*>>hasevent*/
     
     
     
     
     
     
     
      // TODO :: Add flag for hasownprop ? didn't last time
     
     
     
     
      // hasOwnProperty shim by kangax needed for Safari 2.0 support
      _hasOwnProperty = ({}).hasOwnProperty,
      hasOwnProp;

  if (!is(_hasOwnProperty, 'undefined') && !is(_hasOwnProperty.call, 'undefined')) {
    hasOwnProp = function(object, property) {
      return _hasOwnProperty.call(object, property);
    };
  } else {
    hasOwnProp = function(object, property) { /* yes, this can give false positives/negatives, but most of the time we don't care about those */
      return ((property in object) && is(object.constructor.prototype[property], 'undefined'));
    };
  }

  // Adapted from ES5-shim https://github.com/kriskowal/es5-shim/blob/master/es5-shim.js
  // es5.github.com/#x15.3.4.5
  if (!Function.prototype.bind) {
    Function.prototype.bind = function bind(that) {

      var target = this;

      if (typeof target != "function") {
        throw new TypeError();
      }

      var args = slice.call(arguments, 1),
          bound = function() {

          if (this instanceof bound) {

            var F = function() {};
            F.prototype = target.prototype;
            var self = new F();

            var result = target.apply(
            self, args.concat(slice.call(arguments)));
            if (Object(result) === result) {
              return result;
            }
            return self;

          } else {

            return target.apply(
            that, args.concat(slice.call(arguments)));

          }

          };

      return bound;
    };
  }

  /**
   * setCss applies given styles to the Modernizr DOM node.
   */


  function setCss(str) {
    mStyle.cssText = str;
  }

  /**
   * setCssAll extrapolates all vendor-specific css strings.
   */


  function setCssAll(str1, str2) {
    return setCss(prefixes.join(str1 + ';') + (str2 || ''));
  }

  /**
   * is returns a boolean for if typeof obj is exactly type.
   */


  function is(obj, type) {
    return typeof obj === type;
  }

  /**
   * contains returns a boolean for if substr is found within str.
   */


  function contains(str, substr) {
    return !!~ ('' + str).indexOf(substr);
  }

  /*>>testprop*/

  // testProps is a generic CSS / DOM property test.
  // In testing support for a given CSS property, it's legit to test:
  //    `elem.style[styleName] !== undefined`
  // If the property is supported it will return an empty string,
  // if unsupported it will return undefined.
  // We'll take advantage of this quick test and skip setting a style
  // on our modernizr element, but instead just testing undefined vs
  // empty string.
  // Because the testing of the CSS property names (with "-", as
  // opposed to the camelCase DOM properties) is non-portable and
  // non-standard but works in WebKit and IE (but not Gecko or Opera),
  // we explicitly reject properties with dashes so that authors
  // developing in WebKit or IE first don't end up with
  // browser-specific content by accident.

  function testProps(props, prefixed) {
    for (var i in props) {
      var prop = props[i];
      if (!contains(prop, "-") && mStyle[prop] !== undefined) {
        return prefixed == 'pfx' ? prop : true;
      }
    }
    return false;
  } /*>>testprop*/

  // TODO :: add testDOMProps
  /**
   * testDOMProps is a generic DOM property test; if a browser supports
   *   a certain property, it won't return undefined for it.
   */


  function testDOMProps(props, obj, elem) {
    for (var i in props) {
      var item = obj[props[i]];
      if (item !== undefined) {

        // return the property name as a string
        if (elem === false) return props[i];

        // let's bind a function
        if (is(item, 'function')) {
          // default to autobind unless override
          return item.bind(elem || obj);
        }

        // return the unbound function or obj or value
        return item;
      }
    }
    return false;
  }

  /*>>testallprops*/
  /**
   * testPropsAll tests a list of DOM properties we want to check against.
   *   We specify literally ALL possible (known and/or likely) properties on
   *   the element including the non-vendor prefixed one, for forward-
   *   compatibility.
   */


  function testPropsAll(prop, prefixed, elem) {

    var ucProp = prop.charAt(0).toUpperCase() + prop.slice(1),
        props = (prop + ' ' + cssomPrefixes.join(ucProp + ' ') + ucProp).split(' ');

    // did they call .prefixed('boxSizing') or are we just testing a prop?
    if (is(prefixed, "string") || is(prefixed, "undefined")) {
      return testProps(props, prefixed);

      // otherwise, they called .prefixed('requestAnimationFrame', window[, elem])
    } else {
      props = (prop + ' ' + (domPrefixes).join(ucProp + ' ') + ucProp).split(' ');
      return testDOMProps(props, prefixed, elem);
    }
  } /*>>testallprops*/


  /**
   * Tests
   * -----
   */


  // The *new* flexbox
  // dev.w3.org/csswg/css3-flexbox
  tests['flexbox'] = function() {
    return testPropsAll('flexWrap');
  };

  // The *old* flexbox
  // www.w3.org/TR/2009/WD-css3-flexbox-20090723/
  tests['flexboxlegacy'] = function() {
    return testPropsAll('boxDirection');
  };

  // On the S60 and BB Storm, getContext exists, but always returns undefined
  // so we actually have to call getContext() to verify
  // github.com/Modernizr/Modernizr/issues/issue/97/
  tests['canvas'] = function() {
    var elem = document.createElement('canvas');
    return !!(elem.getContext && elem.getContext('2d'));
  };

  tests['canvastext'] = function() {
    return !!(Modernizr['canvas'] && is(document.createElement('canvas').getContext('2d').fillText, 'function'));
  };

  // webk.it/70117 is tracking a legit WebGL feature detect proposal
  // We do a soft detect which may false positive in order to avoid
  // an expensive context creation: bugzil.la/732441
  tests['webgl'] = function() {
    return !!window.WebGLRenderingContext;
  };

/*
     * The Modernizr.touch test only indicates if the browser supports
     *    touch events, which does not necessarily reflect a touchscreen
     *    device, as evidenced by tablets running Windows 7 or, alas,
     *    the Palm Pre / WebOS (touch) phones.
     *
     * Additionally, Chrome (desktop) used to lie about its support on this,
     *    but that has since been rectified: crbug.com/36415
     *
     * We also test for Firefox 4 Multitouch Support.
     *
     * For more info, see: modernizr.github.com/Modernizr/touch.html
     */


  tests['touch'] = function() {
    var bool;

    if (('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch) {
      bool = true;
    } else {
      injectElementWithStyles(['@media (', prefixes.join('touch-enabled),('), mod, ')', '{#modernizr{top:9px;position:absolute}}'].join(''), function(node) {
        bool = node.offsetTop === 9;
      });
    }

    return bool;
  };


  // geolocation is often considered a trivial feature detect...
  // Turns out, it's quite tricky to get right:
  //
  // Using !!navigator.geolocation does two things we don't want. It:
  //   1. Leaks memory in IE9: github.com/Modernizr/Modernizr/issues/513
  //   2. Disables page caching in WebKit: webk.it/43956
  //
  // Meanwhile, in Firefox < 8, an about:config setting could expose
  // a false positive that would throw an exception: bugzil.la/688158
  tests['geolocation'] = function() {
    return 'geolocation' in navigator;
  };


  tests['postmessage'] = function() {
    return !!window.postMessage;
  };


  // Chrome incognito mode used to throw an exception when using openDatabase
  // It doesn't anymore.
  tests['websqldatabase'] = function() {
    return !!window.openDatabase;
  };

  // Vendors had inconsistent prefixing with the experimental Indexed DB:
  // - Webkit's implementation is accessible through webkitIndexedDB
  // - Firefox shipped moz_indexedDB before FF4b9, but since then has been mozIndexedDB
  // For speed, we don't test the legacy (and beta-only) indexedDB
  tests['indexedDB'] = function() {
    return !!testPropsAll("indexedDB", window);
  };

  // documentMode logic from YUI to filter out IE8 Compat Mode
  //   which false positives.
  tests['hashchange'] = function() {
    return isEventSupported('hashchange', window) && (document.documentMode === undefined || document.documentMode > 7);
  };

  // Per 1.6:
  // This used to be Modernizr.historymanagement but the longer
  // name has been deprecated in favor of a shorter and property-matching one.
  // The old API is still available in 1.6, but as of 2.0 will throw a warning,
  // and in the first release thereafter disappear entirely.
  tests['history'] = function() {
    return !!(window.history && history.pushState);
  };

  tests['draganddrop'] = function() {
    var div = document.createElement('div');
    return ('draggable' in div) || ('ondragstart' in div && 'ondrop' in div);
  };

  // FF3.6 was EOL'ed on 4/24/12, but the ESR version of FF10
  // will be supported until FF19 (2/12/13), at which time, ESR becomes FF17.
  // FF10 still uses prefixes, so check for it until then.
  // for more ESR info, see: mozilla.org/en-US/firefox/organizations/faq/
  tests['websockets'] = function() {
    return 'WebSocket' in window || 'MozWebSocket' in window;
  };


  // css-tricks.com/rgba-browser-support/
  tests['rgba'] = function() {
    // Set an rgba() color and check the returned value
    setCss('background-color:rgba(150,255,150,.5)');

    return contains(mStyle.backgroundColor, 'rgba');
  };

  tests['hsla'] = function() {
    // Same as rgba(), in fact, browsers re-map hsla() to rgba() internally,
    //   except IE9 who retains it as hsla
    setCss('background-color:hsla(120,40%,100%,.5)');

    return contains(mStyle.backgroundColor, 'rgba') || contains(mStyle.backgroundColor, 'hsla');
  };

  tests['multiplebgs'] = function() {
    // Setting multiple images AND a color on the background shorthand property
    //  and then querying the style.background property value for the number of
    //  occurrences of "url(" is a reliable method for detecting ACTUAL support for this!
    setCss('background:url(https://),url(https://),red url(https://)');

    // If the UA supports multiple backgrounds, there should be three occurrences
    //   of the string "url(" in the return value for elemStyle.background
    return (/(url\s*\(.*?){3}/).test(mStyle.background);
  };



  // this will false positive in Opera Mini
  //   github.com/Modernizr/Modernizr/issues/396
  tests['backgroundsize'] = function() {
    return testPropsAll('backgroundSize');
  };

  tests['borderimage'] = function() {
    return testPropsAll('borderImage');
  };


  // Super comprehensive table about all the unique implementations of
  // border-radius: muddledramblings.com/table-of-css3-border-radius-compliance
  tests['borderradius'] = function() {
    return testPropsAll('borderRadius');
  };

  // WebOS unfortunately false positives on this test.
  tests['boxshadow'] = function() {
    return testPropsAll('boxShadow');
  };

  // FF3.0 will false positive on this test
  tests['textshadow'] = function() {
    return document.createElement('div').style.textShadow === '';
  };


  tests['opacity'] = function() {
    // Browsers that actually have CSS Opacity implemented have done so
    //  according to spec, which means their return values are within the
    //  range of [0.0,1.0] - including the leading zero.
    setCssAll('opacity:.55');

    // The non-literal . in this regex is intentional:
    //   German Chrome returns this value as 0,55
    // github.com/Modernizr/Modernizr/issues/#issue/59/comment/516632
    return (/^0.55$/).test(mStyle.opacity);
  };


  // Note, Android < 4 will pass this test, but can only animate
  //   a single property at a time
  //   daneden.me/2011/12/putting-up-with-androids-bullshit/
  tests['cssanimations'] = function() {
    return testPropsAll('animationName');
  };


  tests['csscolumns'] = function() {
    return testPropsAll('columnCount');
  };


  tests['cssgradients'] = function() {
    /**
     * For CSS Gradients syntax, please see:
     * webkit.org/blog/175/introducing-css-gradients/
     * developer.mozilla.org/en/CSS/-moz-linear-gradient
     * developer.mozilla.org/en/CSS/-moz-radial-gradient
     * dev.w3.org/csswg/css3-images/#gradients-
     */


    var str1 = 'background-image:',
        str2 = 'gradient(linear,left top,right bottom,from(#9f9),to(white));',
        str3 = 'linear-gradient(left top,#9f9, white);';

    setCss(
    // legacy webkit syntax (FIXME: remove when syntax not in use anymore)
    (str1 + '-webkit- '.split(' ').join(str2 + str1) +
    // standard syntax             // trailing 'background-image:'
    prefixes.join(str3 + str1)).slice(0, -str1.length));

    return contains(mStyle.backgroundImage, 'gradient');
  };


  tests['cssreflections'] = function() {
    return testPropsAll('boxReflect');
  };


  tests['csstransforms'] = function() {
    return !!testPropsAll('transform');
  };


  tests['csstransforms3d'] = function() {

    var ret = !! testPropsAll('perspective');

    // Webkit's 3D transforms are passed off to the browser's own graphics renderer.
    //   It works fine in Safari on Leopard and Snow Leopard, but not in Chrome in
    //   some conditions. As a result, Webkit typically recognizes the syntax but
    //   will sometimes throw a false positive, thus we must do a more thorough check:
    if (ret && 'webkitPerspective' in docElement.style) {

      // Webkit allows this media query to succeed only if the feature is enabled.
      // `@media (transform-3d),(-webkit-transform-3d){ ... }`
      injectElementWithStyles('@media (transform-3d),(-webkit-transform-3d){#modernizr{left:9px;position:absolute;height:3px;}}', function(node, rule) {
        ret = node.offsetLeft === 9 && node.offsetHeight === 3;
      });
    }
    return ret;
  };


  tests['csstransitions'] = function() {
    return testPropsAll('transition');
  };


  /*>>fontface*/
  // @font-face detection routine by Diego Perini
  // javascript.nwbox.com/CSSSupport/
  // false positives:
  //   WebOS github.com/Modernizr/Modernizr/issues/342
  //   WP7   github.com/Modernizr/Modernizr/issues/538
  tests['fontface'] = function() {
    var bool;

    injectElementWithStyles('@font-face {font-family:"font";src:url("https://")}', function(node, rule) {
      var style = document.getElementById('smodernizr'),
          sheet = style.sheet || style.styleSheet,
          cssText = sheet ? (sheet.cssRules && sheet.cssRules[0] ? sheet.cssRules[0].cssText : sheet.cssText || '') : '';

      bool = /src/i.test(cssText) && cssText.indexOf(rule.split(' ')[0]) === 0;
    });

    return bool;
  }; /*>>fontface*/

  // CSS generated content detection
  tests['generatedcontent'] = function() {
    var bool;

    injectElementWithStyles(['#modernizr:after{content:"', smile, '";visibility:hidden}'].join(''), function(node) {
      bool = node.offsetHeight >= 1;
    });

    return bool;
  };



  // These tests evaluate support of the video/audio elements, as well as
  // testing what types of content they support.
  //
  // We're using the Boolean constructor here, so that we can extend the value
  // e.g.  Modernizr.video     // true
  //       Modernizr.video.ogg // 'probably'
  //
  // Codec values from : github.com/NielsLeenheer/html5test/blob/9106a8/index.html#L845
  //                     thx to NielsLeenheer and zcorpan
  // Note: in some older browsers, "no" was a return value instead of empty string.
  //   It was live in FF3.5.0 and 3.5.1, but fixed in 3.5.2
  //   It was also live in Safari 4.0.0 - 4.0.4, but fixed in 4.0.5
  tests['video'] = function() {
    var elem = document.createElement('video'),
        bool = false;

    // IE9 Running on Windows Server SKU can cause an exception to be thrown, bug #224
    try {
      if (bool = !! elem.canPlayType) {
        bool = new Boolean(bool);
        bool.ogg = elem.canPlayType('video/ogg; codecs="theora"').replace(/^no$/, '');

        // Without QuickTime, this value will be `undefined`. github.com/Modernizr/Modernizr/issues/546
        bool.h264 = elem.canPlayType('video/mp4; codecs="avc1.42E01E"').replace(/^no$/, '');

        bool.webm = elem.canPlayType('video/webm; codecs="vp8, vorbis"').replace(/^no$/, '');
      }

    } catch (e) {}

    return bool;
  };

  tests['audio'] = function() {
    var elem = document.createElement('audio'),
        bool = false;

    try {
      if (bool = !! elem.canPlayType) {
        bool = new Boolean(bool);
        bool.ogg = elem.canPlayType('audio/ogg; codecs="vorbis"').replace(/^no$/, '');
        bool.mp3 = elem.canPlayType('audio/mpeg;').replace(/^no$/, '');

        // Mimetypes accepted:
        //   developer.mozilla.org/En/Media_formats_supported_by_the_audio_and_video_elements
        //   bit.ly/iphoneoscodecs
        bool.wav = elem.canPlayType('audio/wav; codecs="1"').replace(/^no$/, '');
        bool.m4a = (elem.canPlayType('audio/x-m4a;') || elem.canPlayType('audio/aac;')).replace(/^no$/, '');
      }
    } catch (e) {}

    return bool;
  };


  // In FF4, if disabled, window.localStorage should === null.
  // Normally, we could not test that directly and need to do a
  //   `('localStorage' in window) && ` test first because otherwise Firefox will
  //   throw bugzil.la/365772 if cookies are disabled
  // Also in iOS5 Private Browsing mode, attempting to use localStorage.setItem
  // will throw the exception:
  //   QUOTA_EXCEEDED_ERRROR DOM Exception 22.
  // Peculiarly, getItem and removeItem calls do not throw.
  // Because we are forced to try/catch this, we'll go aggressive.
  // Just FWIW: IE8 Compat mode supports these features completely:
  //   www.quirksmode.org/dom/html5.html
  // But IE8 doesn't support either with local files
  tests['localstorage'] = function() {
    try {
      localStorage.setItem(mod, mod);
      localStorage.removeItem(mod);
      return true;
    } catch (e) {
      return false;
    }
  };

  tests['sessionstorage'] = function() {
    try {
      sessionStorage.setItem(mod, mod);
      sessionStorage.removeItem(mod);
      return true;
    } catch (e) {
      return false;
    }
  };


  tests['webworkers'] = function() {
    return !!window.Worker;
  };


  tests['applicationcache'] = function() {
    return !!window.applicationCache;
  };


  // Thanks to Erik Dahlstrom
  tests['svg'] = function() {
    return !!document.createElementNS && !! document.createElementNS(ns.svg, 'svg').createSVGRect;
  };

  // specifically for SVG inline in HTML, not within XHTML
  // test page: paulirish.com/demo/inline-svg
  tests['inlinesvg'] = function() {
    var div = document.createElement('div');
    div.innerHTML = '<svg/>';
    return (div.firstChild && div.firstChild.namespaceURI) == ns.svg;
  };

  // SVG SMIL animation
  tests['smil'] = function() {
    return !!document.createElementNS && /SVGAnimate/.test(toString.call(document.createElementNS(ns.svg, 'animate')));
  };

  // This test is only for clip paths in SVG proper, not clip paths on HTML content
  // demo: srufaculty.sru.edu/david.dailey/svg/newstuff/clipPath4.svg
  // However read the comments to dig into applying SVG clippaths to HTML content here:
  //   github.com/Modernizr/Modernizr/issues/213#issuecomment-1149491
  tests['svgclippaths'] = function() {
    return !!document.createElementNS && /SVGClipPath/.test(toString.call(document.createElementNS(ns.svg, 'clipPath')));
  };

  /*>>webforms*/
  // input features and input types go directly onto the ret object, bypassing the tests loop.
  // Hold this guy to execute in a moment.

  function webforms() { /*>>input*/
    // Run through HTML5's new input attributes to see if the UA understands any.
    // We're using f which is the <input> element created early on
    // Mike Taylr has created a comprehensive resource for testing these attributes
    //   when applied to all input types:
    //   miketaylr.com/code/input-type-attr.html
    // spec: www.whatwg.org/specs/web-apps/current-work/multipage/the-input-element.html#input-type-attr-summary
    // Only input placeholder is tested while textarea's placeholder is not.
    // Currently Safari 4 and Opera 11 have support only for the input placeholder
    // Both tests are available in feature-detects/forms-placeholder.js
    Modernizr['input'] = (function(props) {
      for (var i = 0, len = props.length; i < len; i++) {
        attrs[props[i]] = !! (props[i] in inputElem);
      }
      if (attrs.list) {
        // safari false positive's on datalist: webk.it/74252
        // see also github.com/Modernizr/Modernizr/issues/146
        attrs.list = !! (document.createElement('datalist') && window.HTMLDataListElement);
      }
      return attrs;
    })('autocomplete autofocus list placeholder max min multiple pattern required step'.split(' ')); /*>>input*/

    /*>>inputtypes*/
    // Run through HTML5's new input types to see if the UA understands any.
    //   This is put behind the tests runloop because it doesn't return a
    //   true/false like all the other tests; instead, it returns an object
    //   containing each input type with its corresponding true/false value
    // Big thanks to @miketaylr for the html5 forms expertise. miketaylr.com/
    Modernizr['inputtypes'] = (function(props) {

      for (var i = 0, bool, inputElemType, defaultView, len = props.length; i < len; i++) {

        inputElem.setAttribute('type', inputElemType = props[i]);
        bool = inputElem.type !== 'text';

        // We first check to see if the type we give it sticks..
        // If the type does, we feed it a textual value, which shouldn't be valid.
        // If the value doesn't stick, we know there's input sanitization which infers a custom UI
        if (bool) {

          inputElem.value = smile;
          inputElem.style.cssText = 'position:absolute;visibility:hidden;';

          if (/^range$/.test(inputElemType) && inputElem.style.WebkitAppearance !== undefined) {

            docElement.appendChild(inputElem);
            defaultView = document.defaultView;

            // Safari 2-4 allows the smiley as a value, despite making a slider
            bool = defaultView.getComputedStyle && defaultView.getComputedStyle(inputElem, null).WebkitAppearance !== 'textfield' &&
            // Mobile android web browser has false positive, so must
            // check the height to see if the widget is actually there.
            (inputElem.offsetHeight !== 0);

            docElement.removeChild(inputElem);

          } else if (/^(search|tel)$/.test(inputElemType)) {
            // Spec doesn't define any special parsing or detectable UI
            //   behaviors so we pass these through as true
            // Interestingly, opera fails the earlier test, so it doesn't
            //  even make it here.
          } else if (/^(url|email)$/.test(inputElemType)) {
            // Real url and email support comes with prebaked validation.
            bool = inputElem.checkValidity && inputElem.checkValidity() === false;

          } else {
            // If the upgraded input compontent rejects the :) text, we got a winner
            bool = inputElem.value != smile;
          }
        }

        inputs[props[i]] = !! bool;
      }
      return inputs;
    })('search tel url email datetime date month week time datetime-local number range color'.split(' ')); /*>>inputtypes*/
  } /*>>webforms*/


  // End of test definitions
  // -----------------------

  // Run through all tests and detect their support in the current UA.
  // todo: hypothetically we could be doing an array of tests and use a basic loop here.
  for (var feature in tests) {
    if (hasOwnProp(tests, feature)) {
      // run the test, throw the return value into the Modernizr,
      //   then based on that boolean, define an appropriate className
      //   and push it into an array of classes we'll join later.
      featureName = feature.toLowerCase();
      Modernizr[featureName] = tests[feature]();

      classes.push((Modernizr[featureName] ? '' : 'no-') + featureName);
    }
  }

  /*>>webforms*/
  // input tests need to run.
  Modernizr.input || webforms(); /*>>webforms*/


  /**
   * addTest allows the user to define their own feature tests
   * the result will be added onto the Modernizr object,
   * as well as an appropriate className set on the html element
   *
   * @param feature - String naming the feature
   * @param test - Function returning true if feature is supported, false if not
   */

  Modernizr.addTest = function(feature, test) {
    if (typeof feature == 'object') {
      for (var key in feature) {
        if (hasOwnProp(feature, key)) {
          Modernizr.addTest(key, feature[key]);
        }
      }
    } else {

      feature = feature.toLowerCase();

      if (Modernizr[feature] !== undefined) {
        // we're going to quit if you're trying to overwrite an existing test
        // if we were to allow it, we'd do this:
        //   var re = new RegExp("\\b(no-)?" + feature + "\\b");
        //   docElement.className = docElement.className.replace( re, '' );
        // but, no rly, stuff 'em.
        return Modernizr;
      }

      test = typeof test == 'function' ? test() : test;

      if (enableClasses) {
        docElement.className += ' ' + (test ? '' : 'no-') + feature;
      }
      Modernizr[feature] = test;

    }

    return Modernizr; // allow chaining.
  };


  // Reset modElem.cssText to nothing to reduce memory footprint.
  setCss('');
  modElem = inputElem = null;

  /*>>shiv*/
  /*! HTML5 Shiv v3.6 | @afarkas @jdalton @jon_neal @rem | MIT/GPL2 Licensed */
  ;
  (function(window, document) { /*jshint evil:true */
    /** Preset options */
    var options = window.html5 || {};

    /** Used to skip problem elements */
    var reSkip = /^<|^(?:button|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;

    /** Name of the expando, to work with multiple documents or to re-shiv one document */
    var expando = '_html5shiv';

    /** The id for the the documents expando */
    var expanID = 0;

    /** Cached data for each document */
    var expandoData = {};

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

    (function() {
      try {
        var a = document.createElement('a');
        a.innerHTML = '<xyz></xyz>';
        //if the hidden property is implemented we can assume, that the browser supports basic HTML5 Styles
        supportsHtml5Styles = ('hidden' in a);

        supportsUnknownElements = a.childNodes.length == 1 || (function() {
          // assign a false positive if unable to shiv
          (document.createElement)('a');
          var frag = document.createDocumentFragment();
          return (
          typeof frag.cloneNode == 'undefined' || typeof frag.createDocumentFragment == 'undefined' || typeof frag.createElement == 'undefined');
        }());
      } catch (e) {
        supportsHtml5Styles = true;
        supportsUnknownElements = true;
      }

    }());

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

    /**
     * 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;
    }

    /**
     * Returns the data associated to the given document
     * @private
     * @param {Document} ownerDocument The document.
     * @returns {Object} An object of data.
     */


    function getExpandoData(ownerDocument) {
      var data = expandoData[ownerDocument[expando]];
      if (!data) {
        data = {};
        expanID++;
        ownerDocument[expando] = expanID;
        expandoData[expanID] = data;
      }
      return data;
    }

    /**
     * returns a shived element for the given nodeName and document
     * @memberOf html5
     * @param {String} nodeName name of the element
     * @param {Document} ownerDocument The context document.
     * @returns {Object} The shived element.
     */


    function createElement(nodeName, ownerDocument, data) {
      if (!ownerDocument) {
        ownerDocument = document;
      }
      if (supportsUnknownElements) {
        return ownerDocument.createElement(nodeName);
      }
      if (!data) {
        data = getExpandoData(ownerDocument);
      }
      var node;

      if (data.cache[nodeName]) {
        node = data.cache[nodeName].cloneNode();
      } else if (saveClones.test(nodeName)) {
        node = (data.cache[nodeName] = data.createElem(nodeName)).cloneNode();
      } else {
        node = data.createElem(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) ? data.frag.appendChild(node) : node;
    }

    /**
     * returns a shived DocumentFragment for the given document
     * @memberOf html5
     * @param {Document} ownerDocument The context document.
     * @returns {Object} The shived DocumentFragment.
     */


    function createDocumentFragment(ownerDocument, data) {
      if (!ownerDocument) {
        ownerDocument = document;
      }
      if (supportsUnknownElements) {
        return ownerDocument.createDocumentFragment();
      }
      data = data || getExpandoData(ownerDocument);
      var clone = data.frag.cloneNode(),
          i = 0,
          elems = getElements(),
          l = elems.length;
      for (; i < l; i++) {
        clone.createElement(elems[i]);
      }
      return clone;
    }

    /**
     * Shivs the `createElement` and `createDocumentFragment` methods of the document.
     * @private
     * @param {Document|DocumentFragment} ownerDocument The document.
     * @param {Object} data of the document.
     */


    function shivMethods(ownerDocument, data) {
      if (!data.cache) {
        data.cache = {};
        data.createElem = ownerDocument.createElement;
        data.createFrag = ownerDocument.createDocumentFragment;
        data.frag = data.createFrag();
      }


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

      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) {
        data.createElem(nodeName);
        data.frag.createElement(nodeName);
        return 'c("' + nodeName + '")';
      }) + ');return n}')(html5, data.frag);
    }

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

    /**
     * Shivs the given document.
     * @memberOf html5
     * @param {Document} ownerDocument The document to shiv.
     * @returns {Document} The shived document.
     */


    function shivDocument(ownerDocument) {
      if (!ownerDocument) {
        ownerDocument = document;
      }
      var data = getExpandoData(ownerDocument);

      if (html5.shivCSS && !supportsHtml5Styles && !data.hasCSS) {
        data.hasCSS = !! addStyleSheet(ownerDocument,
        // corrects block display not defined in IE6/7/8/9
        'article,aside,figcaption,figure,footer,header,hgroup,nav,section{display:block}' +
        // adds styling not present in IE6/7/8/9
        'mark{background:#FF0;color:#000}');
      }
      if (!supportsUnknownElements) {
        shivMethods(ownerDocument, data);
      }
      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),

      /**
       * Is equal to true if a browser supports creating unknown/HTML5 elements
       * @memberOf html5
       * @type boolean
       */

      'supportsUnknownElements': supportsUnknownElements,

      /**
       * 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,

      //creates a shived element
      createElement: createElement,

      //creates a shived documentFragment
      createDocumentFragment: createDocumentFragment
    };

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

    // expose html5
    window.html5 = html5;

    // shiv the document
    shivDocument(document);

  }(this, document)); /*>>shiv*/

  // Assign private properties to the return object with prefix
  Modernizr._version = version;

  // expose these for the plugin API. Look in the source for how to join() them against your input
  /*>>prefixes*/
  Modernizr._prefixes = prefixes; /*>>prefixes*/
  /*>>domprefixes*/
  Modernizr._domPrefixes = domPrefixes;
  Modernizr._cssomPrefixes = cssomPrefixes; /*>>domprefixes*/

  /*>>mq*/
  // Modernizr.mq tests a given media query, live against the current state of the window
  // A few important notes:
  //   * If a browser does not support media queries at all (eg. oldIE) the mq() will always return false
  //   * A max-width or orientation query will be evaluated against the current state, which may change later.
  //   * You must specify values. Eg. If you are testing support for the min-width media query use:
  //       Modernizr.mq('(min-width:0)')
  // usage:
  // Modernizr.mq('only screen and (max-width:768)')
  Modernizr.mq = testMediaQuery; /*>>mq*/

  /*>>hasevent*/
  // Modernizr.hasEvent() detects support for a given event, with an optional element to test on
  // Modernizr.hasEvent('gesturestart', elem)
  Modernizr.hasEvent = isEventSupported; /*>>hasevent*/

  /*>>testprop*/
  // Modernizr.testProp() investigates whether a given style property is recognized
  // Note that the property names must be provided in the camelCase variant.
  // Modernizr.testProp('pointerEvents')
  Modernizr.testProp = function(prop) {
    return testProps([prop]);
  }; /*>>testprop*/

  /*>>testallprops*/
  // Modernizr.testAllProps() investigates whether a given style property,
  //   or any of its vendor-prefixed variants, is recognized
  // Note that the property names must be provided in the camelCase variant.
  // Modernizr.testAllProps('boxSizing')
  Modernizr.testAllProps = testPropsAll; /*>>testallprops*/


  /*>>teststyles*/
  // Modernizr.testStyles() allows you to add custom styles to the document and test an element afterwards
  // Modernizr.testStyles('#modernizr { position:absolute }', function(elem, rule){ ... })
  Modernizr.testStyles = injectElementWithStyles; /*>>teststyles*/


  /*>>prefixed*/
  // Modernizr.prefixed() returns the prefixed or nonprefixed property name variant of your input
  // Modernizr.prefixed('boxSizing') // 'MozBoxSizing'
  // Properties must be passed as dom-style camelcase, rather than `box-sizing` hypentated style.
  // Return values will also be the camelCase variant, if you need to translate that to hypenated style use:
  //
  //     str.replace(/([A-Z])/g, function(str,m1){ return '-' + m1.toLowerCase(); }).replace(/^ms-/,'-ms-');
  // If you're trying to ascertain which transition end event to bind to, you might do something like...
  //
  //     var transEndEventNames = {
  //       'WebkitTransition' : 'webkitTransitionEnd',
  //       'MozTransition'    : 'transitionend',
  //       'OTransition'      : 'oTransitionEnd',
  //       'msTransition'     : 'MSTransitionEnd',
  //       'transition'       : 'transitionend'
  //     },
  //     transEndEventName = transEndEventNames[ Modernizr.prefixed('transition') ];
  Modernizr.prefixed = function(prop, obj, elem) {
    if (!obj) {
      return testPropsAll(prop, 'pfx');
    } else {
      // Testing DOM property e.g. Modernizr.prefixed('requestAnimationFrame', window) // 'mozRequestAnimationFrame'
      return testPropsAll(prop, obj, elem);
    }
  }; /*>>prefixed*/


  /*>>cssclasses*/
  // Remove "no-js" class from <html> element, if it exists:
  docElement.className = docElement.className.replace(/(^|\s)no-js(\s|$)/, '$1$2') +

  // Add the new classes to the <html> element.
  (enableClasses ? ' js ' + classes.join(' ') : ''); /*>>cssclasses*/

  return Modernizr;

})(window, window.document);
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