response.js

/*
 * https://github.com/ryanve/response.js
 * @license CC0-1.0
 */
!function(root, name, make) {
  var $ = root.jQuery || root.Zepto || root.ender || root.elo;
  if (typeof module != 'undefined' && module.exports) module.exports = make($);
  else root[name] = make($);
}(this || window, 'Response', function($) {

  if (typeof $ != 'function') {
    try {
      return void console.warn('response.js aborted due to missing dependency');
    } catch (e) {}
  }

  var Response
    , Elemset
    , root = this || window
    , name = 'Response'
    , old = root[name]
    , initContentKey = 'init'   name
    , win = window
    , doc = document
    , docElem = doc.documentElement
    , ready = $.domReady || $
    , $win = $(win)
    , DMS = typeof DOMStringMap != 'undefined'
    , AP = Array.prototype
    , OP = Object.prototype
    , push = AP.push
    , concat = AP.concat
    , toString = OP.toString
    , owns = OP.hasOwnProperty
    , isArray = Array.isArray || function(item) {
        return '[object Array]' === toString.call(item);
      }
    , defaultPoints = {
          width: [0, 320, 481, 641, 961, 1025, 1281]
        , height: [0, 481]
        , ratio: [1, 1.5, 2] // device-pixel-ratio
      }
    , propTests = {}
    , isCustom = {}
    , sets = { all: [] }
    , suid = 1
    , screenW = screen.width
    , screenH = screen.height
    , screenMax = screenW > screenH ? screenW : screenH
    , screenMin = screenW   screenH - screenMax
    , deviceW = function() { return screenW; }
    , deviceH = function() { return screenH; }
    , regexFunkyPunc = /[^a-z0-9_.-]/gi
    , regexTrimPunc = /^[\W\s] |[\W\s] $|/g
    , regexCamels = /([a-z])([A-Z])/g
    , regexDashB4 = /-(.)/g
    , regexDataPrefix = /^data-(. )$/

    , procreate = Object.create || function(parent) {
        /** @constructor */
        function Type() {}
        Type.prototype = parent;
        return new Type;
      }
    , namespaceIt = function(eventName, customNamespace) {
        customNamespace = customNamespace || name;
        return eventName.replace(regexTrimPunc, '')   '.'   customNamespace.replace(regexTrimPunc, '');
      }
    , event = {
          allLoaded: namespaceIt('allLoaded') // fires on lazy elemsets when all elems in a set have loaded once
          //, update: namespaceIt('update') // fires on each elem in a set each time that elem is updated
        , crossover: namespaceIt('crossover') // fires on window each time dynamic breakpoint bands is crossed
      }

      // normalized matchMedia
    , matchMedia = win.matchMedia || win.msMatchMedia
    , media = matchMedia ? bind(matchMedia, win) : function() {
        return {};
      }
    , mq = matchMedia ? function(q) {
        return !!matchMedia.call(win, q).matches;
      } : function() {
        return false;
      }

      // http://ryanve.com/lab/dimensions
      // http://github.com/ryanve/verge/issues/13
    , viewportW = function() {
        var a = docElem.clientWidth, b = win.innerWidth;
        return a < b ? b : a;
      }
    , viewportH = function() {
        var a = docElem.clientHeight, b = win.innerHeight;
        return a < b ? b : a;
      }

    , band = bind(between, viewportW)
    , wave = bind(between, viewportH)
    , device = {
          'band': bind(between, deviceW)
        , 'wave': bind(between, deviceH)
      };

  function isNumber(item) {
    return item ===  item;
  }

  /**
   * @param {Function} fn
   * @param {*=} scope
   * @return {Function}
   */
  function bind(fn, scope) {
    return function() {
      return fn.apply(scope, arguments);
    };
  }

  /**
   * @this {Function}
   * @param {number} min
   * @param {number=} max
   * @return {boolean}
   */
  function between(min, max) {
    var point = this.call();
    return point >= (min || 0) && (!max || point <= max);
  }

  /**
   * @param {{length:number}} stack
   * @param {Function} fn
   * @param {*=} scope
   * @return {Array}
   */
  function map(stack, fn, scope) {
    for (var r = [], l = stack.length, i = 0; i < l;) r[i] = fn.call(scope, stack[i], i  , stack);
    return r;
  }

  /**
   * @param {string|{length:number}} list
   * @return {Array} new and compact
   */
  function compact(list) {
    return !list ? [] : sift(typeof list == 'string' ? list.split(' ') : list);
  }

  /**
   * @since 0.4.0, supports scope and sparse-item iteration since 0.6.2
   * @param {{length:number}} stack
   * @param {Function} fn
   * @param {*=} scope
   */
  function each(stack, fn, scope) {
    if (null == stack) return stack;
    for (var l = stack.length, i = 0; i < l;) fn.call(scope || stack[i], stack[i], i  , stack);
    return stack;
  }

  /**
   * @since 0.4.0 skips null|undefined since 0.6.2, adds `0` since 0.7.11
   * @param {{length:number}} stack
   * @param {(string|number)=} prefix
   * @param {(string|number)=} suffix
   * @return {Array} new array of affixed strings or added numbers
   */
  function affix(stack, prefix, suffix) {
    if (null == prefix) prefix = '';
    if (null == suffix) suffix = '';
    for (var r = [], l = stack.length, i = 0; i < l; i  )
      null == stack[i] || r.push(prefix   stack[i]   suffix);
    return r;
  }

  /**
   * @param {{length:number}} stack to iterate
   * @param {(Function|string|*)=} fn callback or typestring
   * @param {(Object|boolean|*)=} scope or inversion boolean
   * @since 0.4.0, supports scope and typestrings since 0.6.2
   * @example Response.sift([5, 0, 'str'], isFinite) // [5, 0]
   * @example Response.sift([5, 0, 'str']) // [5, 'str']
   */
  function sift(stack, fn, scope) {
    var fail, l, v, r = [], u = 0, i = 0, run = typeof fn == 'function', not = true === scope;
    for (l = stack && stack.length, scope = not ? null : scope; i < l; i  ) {
      v = stack[i];
      fail = run ? !fn.call(scope, v, i, stack) : fn ? typeof v !== fn : !v;
      fail === not && (r[u  ] = v);
    }
    return r;
  }

  /**
   * @since 0.3.0
   * @param {Object|Array|Function|*} r receiver
   * @param {Object|Array|Function|*} s supplier Undefined values are ignored.
   * @return {Object|Array|Function|*} receiver
   */
  function merge(r, s) {
    if (null == r || null == s) return r;
    if (typeof s == 'object' && isNumber(s.length)) push.apply(r, sift(s, 'undefined', true));
    else for (var k in s) owns.call(s, k) && void 0 !== s[k] && (r[k] = s[k]);
    return r;
  }

  /**
   * @description Call `fn` on each stack value or directly on a non-stack item
   * @since 0.3.0 scope support added in 0.6.2
   * @param {*} item stack or non-stack item
   * @param {Function} fn callback
   * @param {*=} scope defaults to current item
   */
  function route(item, fn, scope) {
    if (null == item) return item;
    if (typeof item == 'object' && !item.nodeType && isNumber(item.length)) each(item, fn, scope);
    else fn.call(scope || item, item);
    return item;
  }

  /**
   * Response.dpr(decimal) Tests if a minimum device pixel ratio is active.
   * Or (version added in 0.3.0) returns the device-pixel-ratio
   * @param {number} decimal is the integer or float to test.
   * @return {boolean|number}
   * @example Response.dpr() // get the device-pixel-ratio (or 0 if undetectable)
   * @example Response.dpr(1.5) // true when device-pixel-ratio is 1.5 
   * @example Response.dpr(2) // true when device-pixel-ratio is 2 
   */
  function dpr(decimal) {
    // Consider: github.com/ryanve/res
    var dPR = win.devicePixelRatio;
    if (null == decimal) return dPR || (dpr(2) ? 2 : dpr(1.5) ? 1.5 : dpr(1) ? 1 : 0); // approx
    if (!isFinite(decimal)) return false;

    // Use window.devicePixelRatio if supported - supported by Webkit
    // (Safari/Chrome/Android) and Presto 2.8  (Opera) browsers.
    if (dPR && dPR > 0) return dPR >= decimal;

    // Fallback to .matchMedia/.msMatchMedia. Supported by Gecko (FF6 ) and more:
    // @link developer.mozilla.org/en/DOM/window.matchMedia
    // -webkit-min- and -o-min- omitted (Webkit/Opera supported above)
    // The generic min-device-pixel-ratio is expected to be added to the W3 spec.
    // Return false if neither method is available.
    decimal = 'only all and (min--moz-device-pixel-ratio:'   decimal   ')';
    if (mq(decimal)) return true;
    return mq(decimal.replace('-moz-', ''));
  }

  /**
   * Response.camelize
   * @example Response.camelize('data-casa-blanca') // casaBlanca
   */
  function camelize(s) {
    // Remove data- prefix and convert remaining dashed string to camelCase:
    return s.replace(regexDataPrefix, '$1').replace(regexDashB4, function(m, m1) {
      return m1.toUpperCase();
    });
  }

  /**
   * Response.datatize
   * Converts pulpFiction (or data-pulpFiction) to data-pulp-fiction
   * @example Response.datatize('casaBlanca')  // data-casa-blanca
   */
  function datatize(s) {
    // Make sure there's no data- already in s for it to work right in IE8.
    return 'data-'   (s ? s.replace(regexDataPrefix, '$1').replace(regexCamels, '$1-$2').toLowerCase() : s);
  }

  /**
   * Convert stringified primitives back to JavaScript.
   * @param {string|*} s String to parse into a JavaScript value.
   * @return {*}
   */
  function parse(s) {
    var n; // undefined, or becomes number
    return typeof s != 'string' || !s ? s
      : 'false' === s ? false
      : 'true' === s ? true
      : 'null' === s ? null
      : 'undefined' === s || (n = ( s)) || 0 === n || 'NaN' === s ? n
      : s;
  }

  /**
   * @param {Element|{length:number}} e
   * @return {Element|*}
   */
  function first(e) {
    return !e || e.nodeType ? e : e[0];
  }

  /**
   * internal-use function to iterate a node's attributes
   * @param {Element} el
   * @param {Function} fn
   * @param {(boolean|*)=} exp
   */
  function eachAttr(el, fn, exp) {
    var test, n, a, i, l;
    if (!el.attributes) return;
    test = typeof exp == 'boolean' ? /^data-/ : test;
    for (i = 0, l = el.attributes.length; i < l;) {
      if (a = el.attributes[i  ]) {
        n = ''   a.name;
        test && test.test(n) !== exp || null == a.value || fn.call(el, a.value, n, a);
      }
    }
  }

  /**
   * Get object containing an element's data attrs.
   * @param {Element} el
   * @return {DOMStringMap|Object|undefined}
   */
  function getDataset(el) {
    var ob;
    if (!el || 1 !== el.nodeType) return;  // undefined
    if (ob = DMS && el.dataset) return ob; // native
    ob = {}; // Fallback plain object cannot mutate the dataset via reference.
    eachAttr(el, function(v, k) {
      ob[camelize(k)] = ''   v;
    }, true);
    return ob;
  }

  /**
   * @param {Element} el
   * @param {Object} ob
   * @param {Function} fn
   */
  function setViaObject(el, ob, fn) {
    for (var n in ob) owns.call(ob, n) && fn(el, n, ob[n]);
  }

  /**
   * @param {Object|Array|Function} el
   * @param {(string|Object|*)=} k
   * @param {*=} v
   */
  function dataset(el, k, v) {
    el = first(el);
    if (!el || !el.setAttribute) return;
    if (void 0 === k && v === k) return getDataset(el);
    var exact = isArray(k) && datatize(k[0]);
    if (typeof k == 'object' && !exact) {
      k && setViaObject(el, k, dataset);
    } else {
      k = exact || datatize(k);
      if (!k) return;
      if (void 0 === v) {
        k = el.getAttribute(k); // repurpose
        return null == k ? v : exact ? parse(k) : ''   k; // normalize
      }
      el.setAttribute(k, v = ''   v);
      return v; // current value
    }
  }

  /**
   * Response.deletes(elem, keys) Delete HTML5 data attributes (remove them from them DOM)
   * @since 0.3.0
   * @param {Element|{length:number}} elem is a DOM element or stack of them
   * @param {string|Array} ssv data attribute key(s) in camelCase or lowercase to delete
   */
  function deletes(elem, ssv) {
    ssv = compact(ssv);
    route(elem, function(el) {
      each(ssv, function(k) {
        el.removeAttribute(datatize(k));
      });
    });
  }

  function sel(keys) {
    // Convert an array of data keys into a selector string
    // Converts ["a","b","c"] into "[data-a],[data-b],[data-c]"
    // Double-slash escapes periods so that attrs like data-density-1.5 will work
    // @link api.jquery.com/category/selectors/
    // @link github.com/jquery/sizzle/issues/76
    for (var k, r = [], i = 0, l = keys.length; i < l;) {
      (k = keys[i  ]) && r.push('['   datatize(k.replace(regexTrimPunc, '').replace('.', '\\.'))   ']');
    }
    return r.join();
  }

  /**
   * Response.target() Get the corresponding data attributes for an array of data keys.
   * @since 0.1.9
   * @param {Array} keys is the array of data keys whose attributes you want to select.
   * @return {Object} jQuery stack
   * @example Response.target(['a', 'b', 'c']) //  $('[data-a],[data-b],[data-c]')
   * @example Response.target('a b c']) //  $('[data-a],[data-b],[data-c]')
   */
  function target(keys) {
    return $(sel(compact(keys)));
  }

  /**
   * @since 0.3.0
   * @return {number} like jQuery(window).scrollLeft()
   */
  function scrollX() {
    return window.pageXOffset || docElem.scrollLeft;
  }

  /**
   * @since 0.3.0
   * @return {number} like $(window).scrollTop()
   */
  function scrollY() {
    return window.pageYOffset || docElem.scrollTop;
  }

  /**
   * area methods inX/inY/inViewport
   * @since 0.3.0
   */
  function rectangle(el, verge) {
    // Local handler for area methods:
    // adapted from github.com/ryanve/dime
    // The native object is read-only so we
    // have use a copy in order to modify it.
    var r = el.getBoundingClientRect ? el.getBoundingClientRect() : {};
    verge = typeof verge == 'number' ? verge || 0 : 0;
    return {
        top: (r.top || 0) - verge
      , left: (r.left || 0) - verge
      , bottom: (r.bottom || 0)   verge
      , right: (r.right || 0)   verge
    };
  }

  // The verge is the amount of pixels to act as a cushion around the viewport. It can be any
  // integer. If verge is zero, then the inX/inY/inViewport methods are exact. If verge is set to 100,
  // then those methods return true when for elements that are are in the viewport *or* near it,
  // with *near* being defined as within 100 pixels outside the viewport edge. Elements immediately
  // outside the viewport are 'on the verge' of being scrolled to.

  function inX(elem, verge) {
    var r = rectangle(first(elem), verge);
    return !!r && r.right >= 0 && r.left <= viewportW();
  }

  function inY(elem, verge) {
    var r = rectangle(first(elem), verge);
    return !!r && r.bottom >= 0 && r.top <= viewportH();
  }

  function inViewport(elem, verge) {
    // equiv to: inX(elem, verge) && inY(elem, verge)
    // But just manually do both to avoid calling rectangle() and first() twice.
    // It actually gzips smaller this way too:
    var r = rectangle(first(elem), verge);
    return !!r && r.bottom >= 0 && r.top <= viewportH() && r.right >= 0 && r.left <= viewportW();
  }

  /**
   * @description Detect whether elem should act in src or markup mode.
   * @param {Element} elem
   * @return {number}
   */
  function detectMode(elem) {
    // Normalize to lowercase to ensure compatibility across HTML/XHTML/XML.
    // These are the elems that can use src attr per the W3 spec:
    //dev.w3.org/html5/spec-author-view/index.html#attributes-1
    //stackoverflow.com/q/8715689/770127
    //stackoverflow.com/a/4878963/770127
    var srcElems = { img:1, input:1, source:3, embed:3, track:3, iframe:5, audio:5, video:5, script:5 }
      , modeID = srcElems[ elem.nodeName.toLowerCase() ] || -1;

    // -5 => markup mode for video/audio/iframe w/o src attr.
    // -1 => markup mode for any elem not in the array above.
    //  1 => src mode  for img/input (empty content model). Images.
    //  3 => src mode  for source/embed/track (empty content model). Media *or* time data.
    //  5 => src mode  for audio/video/iframe/script *with* src attr.
    //  If we at some point we need to differentiate <track> we'll use 4, but for now
    //  it's grouped with the other non-image empty content elems that use src.
    //  hasAttribute is not supported in IE7 so check elem.getAttribute('src')
    return 4 > modeID ? modeID : null != elem.getAttribute('src') ? 5 : -5;
  }

  /**
   * Response.store()
   * Store a data value on each elem targeted by a jQuery selector. We use this for storing an
   * elem's orig (no-js) state. This gives us the ability to return the elem to its orig state.
   * The data it stores is either the src attr or the innerHTML based on result of detectMode().
   * @since 0.1.9
   * @param {Object} $elems DOM element | jQuery object | nodeList | array of elements
   * @param {string} key is the key to use to store the orig value w/ @link api.jquery.com/data/
   * @param {string=} source  (@since 0.6.2) an optional attribute name to read data from
   */
  function store($elems, key, source) {
    var valToStore;
    if (!$elems || null == key) throw new TypeError('@store');
    source = typeof source == 'string' && source;
    route($elems, function(el) {
      if (source) valToStore = el.getAttribute(source);
      else if (0 < detectMode(el)) valToStore = el.getAttribute('src');
      else valToStore = el.innerHTML;
      null == valToStore ? deletes(el, key) : dataset(el, key, valToStore);
    });
    return Response;
  }

  /**
   * Response.access() Access data-* values for element from an array of data-* keys.
   * @since 0.1.9 added support for space-separated strings in 0.3.1
   * @param {Object} elem is a native or jQuery element whose values to access.
   * @param {Array|string} keys is an array or SSV string of data keys
   * @return {Array} dataset values corresponding to each key. Since 0.4.0 if
   *   the params are wrong then the return is an empty array.
   */
  function access(elem, keys) {
    var ret = [];
    elem && keys && each(compact(keys), function(k) {
      ret.push(dataset(elem, k));
    }, elem);
    return ret;
  }

  function addTest(prop, fn) {
    if (typeof prop == 'string' && typeof fn == 'function') {
      propTests[prop] = fn;
      isCustom[prop] = 1;
    }
    return Response;
  }

  // Prototype object for element sets used in Response.create
  // Each element in the set inherits this as well, so some of the
  // methods apply to the set, while others apply to single elements.
  Elemset = (function() {
    var crossover = event.crossover
      //, update = event.update
      , min = Math.min;

    // Techically data attributes names can contain uppercase in HTML, but, The DOM lowercases
    // attributes, so they must be lowercase regardless when we target them in jQuery. Force them
    // lowercase here to prevent issues. Removing all punc marks except for dashes, underscores,
    // and periods so that we don't have to worry about escaping anything crazy.
    // Rules @link dev.w3.org/html5/spec/Overview.html#custom-data-attribute
    // jQuery selectors @link api.jquery.com/category/selectors/
    function sanitize(key) {
      // Allow lowercase alphanumerics, dashes, underscores, and periods:
      return typeof key == 'string' ? key.toLowerCase().replace(regexFunkyPunc, '') : '';
    }

    function ascending(a, b) {
      return a - b;
    }

    return {
        $e: 0 // jQuery instance
      , mode: 0 // integer  defined per element
      , breakpoints: null // array, validated @ configure()
      , prefix: null // string, validated @ configure()
      , prop: 'width' // string, validated @ configure()
      , keys: [] // array, defined @ configure()
      , dynamic: null // boolean, defined @ configure()
      , custom: 0 // boolean, see addTest()
      , values: [] // array, available values
      , fn: 0 // callback, the test fn, defined @ configure()
      , verge: null // integer  uses default based on device size
      , newValue: 0
      , currValue: 1
      , aka: null
      , lazy: null
      , i: 0  // integer, the index of the current highest active breakpoint min
      , uid: null

      , reset: function() {
          var subjects = this.breakpoints, i = subjects.length, tempIndex = 0;
          while (!tempIndex && i--) this.fn(subjects[i]) && (tempIndex = i);
          if (tempIndex !== this.i) {
            // Crossover occurred. Fire the crossover events:
            $win.trigger(crossover).trigger(this.prop   crossover);
            this.i = tempIndex || 0;
          }
          return this;
        }

      , configure: function(options) {
          merge(this, options);

          var i, points, prefix, aliases, aliasKeys, isNumeric = true, prop = this.prop;
          this.uid = suid  ;
          if (null == this.verge) this.verge = min(screenMax, 500);
          if (!(this.fn = propTests[prop])) throw new TypeError('@create');

          // If we get to here then we know the prop is one one our supported props:
          // 'width', 'height', 'device-width', 'device-height', 'device-pixel-ratio'
          if (null == this.dynamic) this.dynamic = 'device' !== prop.slice(0, 6);

          this.custom = isCustom[prop];
          prefix = this.prefix ? sift(map(compact(this.prefix), sanitize)) : ['min-'   prop   '-'];
          aliases = 1 < prefix.length ? prefix.slice(1) : 0;
          this.prefix = prefix[0];
          points = this.breakpoints;

          // Sort and validate (#valid8) custom breakpoints if supplied.
          // Must be done before keys are created so that the keys match:
          if (isArray(points)) {
            each(points, function(v) {
              if (!v && v !== 0) throw 'invalid breakpoint';
              isNumeric = isNumeric && isFinite(v);
            });

            isNumeric && points.sort(ascending);
            if (!points.length) throw new TypeError('.breakpoints');
          } else {
            // The default breakpoints are presorted.
            points = defaultPoints[prop] || defaultPoints[prop.split('-').pop()];
            if (!points) throw new TypeError('.prop');
          }

          this.breakpoints = points;
          this.keys = affix(this.breakpoints, this.prefix); // Create array of data keys.
          this.aka = null; // Reset just in case a value was merged in.

          if (aliases) {
            aliasKeys = [];
            i = aliases.length;
            while (i--) aliasKeys.push(affix(this.breakpoints, aliases[i]));
            this.aka = aliasKeys; // this.aka is an array of arrays (one for each alias)
            this.keys = concat.apply(this.keys, aliasKeys); // flatten aliases into this.keys
          }

          sets.all = sets.all.concat(sets[this.uid] = this.keys); // combined keys ===> sets.all
          return this;
        }

      , target: function() {
          this.$e = $(sel(sets[this.uid])); // Cache selection. DOM must be ready.
          store(this.$e, initContentKey);  // Store original (no-js) value to data key.
          this.keys.push(initContentKey);  // #keys now equals #breakpoints 1
          return this;
        }

      // The rest of the methods are designed for use with single elements.
      // They are for use in a cloned instances within a loop.
      , decideValue: function() {
          // Return the first value from the values array that passes the boolean
          // test callback. If none pass the test, then return the fallback value.
          // this.breakpoints.length === this.values.length   1
          // The extra member in the values array is the initContentKey value.
          var val = null, subjects = this.breakpoints, sL = subjects.length, i = sL;
          while (val == null && i--) this.fn(subjects[i]) && (val = this.values[i]);
          this.newValue = typeof val == 'string' ? val : this.values[sL];
          return this; // chainable
        }

      , prepareData: function(elem) {
          this.$e = $(elem);
          this.mode = detectMode(elem);
          this.values = access(this.$e, this.keys);
          if (this.aka) {
            // If there are alias keys then there may be alias values. Merge the values from
            // all the aliases into the values array. The merge method only merges in truthy values
            // and prevents falsey values from overwriting truthy ones. (See Response.merge)
            // Each of the this.aka arrays has the same length as the this.values
            // array, so no new indexes will be added, just filled if there's truthy values.
            var i = this.aka.length;
            while (i--) this.values = merge(this.values, access(this.$e, this.aka[i]));
          }
          return this.decideValue();
        }

      , updateDOM: function() {
          // Apply the method that performs the actual swap. When updateDOM called this.$e and this.e refer
          // to single elements. Only update the DOM when the new value is different than the current value.
          if (this.currValue === this.newValue) { return this; }
          this.currValue = this.newValue;
          if (0 < this.mode) {
            this.$e[0].setAttribute('src', this.newValue);
          } else if (null == this.newValue) {
            this.$e.empty && this.$e.empty();
          } else {
            if (this.$e.html) {
              this.$e.html(this.newValue);
            } else {
              this.$e.empty && this.$e.empty();
              this.$e[0].innerHTML = this.newValue;
            }
          }
          // this.$e.trigger(update); // may add this event in future
          return this;
        }
    };
  }());

  // The keys are the prop and the values are the method that tests that prop.
  // The props with dashes in them are added via array notation below.
  // Props marked as dynamic change when the viewport is resized:
  propTests['width'] = band;   // dynamic
  propTests['height'] = wave;  // dynamic
  propTests['device-width'] = device.band;
  propTests['device-height'] = device.wave;
  propTests['device-pixel-ratio'] = dpr;

  function resize(fn) {
    $win.on('resize', fn);
    return Response; // chain
  }

  function crossover(prop, fn) {
    var temp, eventToFire, eventCrossover = event.crossover;
    if (typeof prop == 'function') {// support args in reverse
      temp = fn;
      fn = prop;
      prop = temp;
    }
    eventToFire = prop ? (''   prop   eventCrossover) : eventCrossover;
    $win.on(eventToFire, fn);
    return Response; // chain
  }

  /**
   * Response.action A facade for calling functions on both the ready and resize events.
   * @link http://responsejs.com/#action
   * @since 0.1.3
   * @param {Function|Array} action is the callback name or array of callback names to call.
   * @example Response.action(myFunc1) // call myFunc1() on ready/resize
   * @example Response.action([myFunc1, myFunc2]) // call myFunc1(), myFunc2() ...
   */
  function action(fnOrArr) {
    route(fnOrArr, function(fn) {
      ready(fn);
      resize(fn);
    });
    return Response;
  }

  /**
   * Create their own Response attribute sets, with custom breakpoints and data-* names.
   * @since 0.1.9
   * @param {Object|Array} args is an options object or an array of options objects.
   * @link http://responsejs.com/#create
   * @example Response.create(object) // single
   * @example Response.create([object1, object2]) // bulk
   */
  function create(args) {
    route(args, function(options) {
      if (typeof options != 'object') throw new TypeError('@create');
      var elemset = procreate(Elemset).configure(options)
        , lowestNonZeroBP
        , verge = elemset.verge
        , breakpoints = elemset.breakpoints
        , scrollName = namespaceIt('scroll')
        , resizeName = namespaceIt('resize');

      if (!breakpoints.length) return;

      // Identify the lowest nonzero breakpoint. (They're already sorted low to high by now.)
      lowestNonZeroBP = breakpoints[0] || breakpoints[1] || false;

      ready(function() {
        var allLoaded = event.allLoaded, lazy = !!elemset.lazy;

        function resizeHandler() {
          elemset.reset();
          each(elemset.$e, function(el, i) {
            elemset[i].decideValue().updateDOM();
          }).trigger(allLoaded);
        }

        function scrollHandler() {
          each(elemset.$e, function(el, i) {
            inViewport(elemset[i].$e, verge) && elemset[i].updateDOM();
          });
        }

        // Target elements containing this set's Response data attributes and chain into the
        // loop that occurs on ready. The selector is cached to elemset.$e for later use.
        each(elemset.target().$e, function(el, i) {
          elemset[i] = procreate(elemset).prepareData(el);// Inherit from elemset
          if (!lazy || inViewport(elemset[i].$e, verge)) {
            // If not lazy update all the elems in the set. If
            // lazy, only update elems in the current viewport.
            elemset[i].updateDOM();
          }
        });

        // device-* props are static and only need to be tested once. The others are
        // dynamic, meaning they need to be tested on resize. Also if a device so small
        // that it doesn't support the lowestNonZeroBP then we don't need to listen for
        // resize events b/c we know the device can't resize beyond that breakpoint.

        if (elemset.dynamic && (elemset.custom || lowestNonZeroBP < screenMax)) {
           resize(resizeHandler, resizeName);
        }

        // We don't have to re-decide the content on scrolls because neither the viewport or device
        // properties change from a scroll. This setup minimizes the operations binded to the scroll
        // event. Once everything in the set has been swapped once, the scroll handler is deactivated
        // through the use of a custom event.
        if (!lazy) return;

        $win.on(scrollName, scrollHandler);
        elemset.$e.one(allLoaded, function() {
          $win.off(scrollName, scrollHandler);
        });
      });
    });
    return Response;
  }

  function noConflict(callback) {
    if (root[name] === Response) root[name] = old;
    if (typeof callback == 'function') callback.call(root, Response);
    return Response;
  }

  // Many methods are @deprecated (see issue #51)
  Response = {
      deviceMin: function() { return screenMin; }
    , deviceMax: function() { return screenMax; }
    //, sets: function(prop) {// must be uid
    //  return $(sel(sets[prop] || sets.all));
    //}
    , noConflict: noConflict
    , create: create
    , addTest: addTest
    , datatize: datatize
    , camelize: camelize
    , render: parse
    , store: store
    , access: access
    , target: target
    , object: procreate
    , crossover: crossover
    , action: action
    , resize: resize
    , ready: ready
    , affix: affix
    , sift: sift
    , dpr: dpr
    , deletes: deletes
    , scrollX: scrollX
    , scrollY: scrollY
    , deviceW: deviceW
    , deviceH: deviceH
    , device: device
    , inX: inX
    , inY: inY
    , route: route
    , merge: merge
    , media: media
    , mq: mq
    , wave: wave
    , band: band
    , map: map
    , each: each
    , inViewport: inViewport
    , dataset: dataset
    , viewportH: viewportH
    , viewportW: viewportW
  };

  // Initialize
  ready(function() {
    var settings = dataset(doc.body, 'responsejs'), parse = win.JSON && JSON.parse || $.parseJSON;
    settings = settings && parse ? parse(settings) : settings;
    settings && settings.create && create(settings.create);
    // Remove .no-responsejs and add .responsejs
    docElem.className = docElem.className.replace(/(^|\s)(no-)?responsejs(\s|$)/, '$1$3')   ' responsejs ';
  });

  return Response;
});