text: /**
   * Copyright (c) 2011-2013 Felix Gnass
   * Licensed under the MIT license
   */
  (function(root, factory) {
  
    /* CommonJS */
    if (typeof exports == 'object')  module.exports = factory();
  
    /* AMD module */
    else if (typeof define == 'function' && define.amd) define(factory);
  
    /* Browser global */
    else root.Spinner = factory()
  }
  (this, function() {
    "use strict";
  
    var prefixes = ['webkit', 'Moz', 'ms', 'O'] /* Vendor prefixes */
      , animations = {} /* Animation rules keyed by their name */
      , useCssAnimations; /* Whether to use CSS animations or setTimeout */
  
    /**
     * Utility function to create elements. If no tag name is given,
     * a DIV is created. Optionally properties can be passed.
     */
    function createEl(tag, prop) {
      var el = document.createElement(tag || 'div')
        , n;
  
      for(n in prop) el[n] = prop[n]
      return el
    }
  
    /**
     * Appends children and returns the parent.
     */
    function ins(parent /* child1, child2, ...*/) {
      for (var i=1, n=arguments.length; i<n; i++)
        parent.appendChild(arguments[i])
  
      return parent
    }
  
    /**
     * Insert a new stylesheet to hold the @keyframe or VML rules.
     */
    var sheet = (function() {
      var el = createEl('style', {type : 'text/css'});
      ins(document.getElementsByTagName('head')[0], el);
      return el.sheet || el.styleSheet
    }());
  
    /**
     * Creates an opacity keyframe animation rule and returns its name.
     * Since most mobile Webkits have timing issues with animation-delay,
     * we create separate rules for each line/segment.
     */
    function addAnimation(alpha, trail, i, lines) {
      var name = ['opacity', trail, ~~(alpha*100), i, lines].join('-')
        , start = 0.01 + i/lines * 100
        , z = Math.max(1 - (1-alpha) / trail * (100-start), alpha)
        , prefix = useCssAnimations.substring(0, useCssAnimations.indexOf('Animation')).toLowerCase()
        , pre = prefix && '-' + prefix + '-' || '';
  
      if (!animations[name]) {
        sheet.insertRule(
          '@' + pre + 'keyframes ' + name + '{' +
          '0%{opacity:' + z + '}' +
          start + '%{opacity:' + alpha + '}' +
          (start+0.01) + '%{opacity:1}' +
          (start+trail) % 100 + '%{opacity:' + alpha + '}' +
          '100%{opacity:' + z + '}' +
          '}', sheet.cssRules.length);
  
        animations[name] = 1
      }
  
      return name
    }
  
    /**
     * Tries various vendor prefixes and returns the first supported property.
     */
    function vendor(el, prop) {
      var s = el.style
        , pp
        , i;
  
      prop = prop.charAt(0).toUpperCase() + prop.slice(1);
      for(i=0; i<prefixes.length; i++) {
        pp = prefixes[i]+prop;
        if(s[pp] !== undefined) return pp
      }
      if(s[prop] !== undefined) return prop
    }
  
    /**
     * Sets multiple style properties at once.
     */
    function css(el, prop) {
      for (var n in prop)
        el.style[vendor(el, n)||n] = prop[n]
  
      return el
    }
  
    /**
     * Fills in default values.
     */
    function merge(obj) {
      for (var i=1; i < arguments.length; i++) {
        var def = arguments[i];
        for (var n in def)
          if (obj[n] === undefined) obj[n] = def[n]
      }
      return obj
    }
  
    /**
     * Returns the absolute page-offset of the given element.
     */
    function pos(el) {
      var o = { x:el.offsetLeft, y:el.offsetTop };
      while((el = el.offsetParent))
        o.x+=el.offsetLeft, o.y+=el.offsetTop;
  
      return o
    }
  
    /**
     * Returns the line color from the given string or array.
     */
    function getColor(color, idx) {
      return typeof color == 'string' ? color : color[idx % color.length]
    }
  
    // Built-in defaults
  
    var defaults = {
      lines: 12,            // The number of lines to draw
      length: 7,            // The length of each line
      width: 5,             // The line thickness
      radius: 10,           // The radius of the inner circle
      rotate: 0,            // Rotation offset
      corners: 1,           // Roundness (0..1)
      color: '#000',        // #rgb or #rrggbb
      direction: 1,         // 1: clockwise, -1: counterclockwise
      speed: 1,             // Rounds per second
      trail: 100,           // Afterglow percentage
      opacity: 1/4,         // Opacity of the lines
      fps: 20,              // Frames per second when using setTimeout()
      zIndex: 2e9,          // Use a high z-index by default
      className: 'spinner', // CSS class to assign to the element
      top: 'auto',          // center vertically
      left: 'auto',         // center horizontally
      position: 'relative'  // element position
    };
  
    /** The constructor */
    function Spinner(o) {
      if (typeof this == 'undefined') return new Spinner(o);
      this.opts = merge(o || {}, Spinner.defaults, defaults)
    }
  
    // Global defaults that override the built-ins:
    Spinner.defaults = {};
  
    merge(Spinner.prototype, {
  
      /**
       * Adds the spinner to the given target element. If this instance is already
       * spinning, it is automatically removed from its previous target b calling
       * stop() internally.
       */
      spin: function(target) {
        this.stop();
  
        var self = this
          , o = self.opts
          , el = self.el = css(createEl(0, {className: o.className}), {position: o.position, width: 0, zIndex: o.zIndex})
          , mid = o.radius+o.length+o.width
          , ep // element position
          , tp; // target position
  
        if (target) {
          target.insertBefore(el, target.firstChild||null);
          tp = pos(target);
          ep = pos(el);
          css(el, {
            left: (o.left == 'auto' ? tp.x-ep.x + (target.offsetWidth >> 1) : parseInt(o.left, 10) + mid) + 'px',
            top: (o.top == 'auto' ? tp.y-ep.y + (target.offsetHeight >> 1) : parseInt(o.top, 10) + mid)  + 'px'
          })
        }
  
        el.setAttribute('role', 'progressbar');
        self.lines(el, self.opts);
  
        if (!useCssAnimations) {
          // No CSS animation support, use setTimeout() instead
          var i = 0
            , start = (o.lines - 1) * (1 - o.direction) / 2
            , alpha
            , fps = o.fps
            , f = fps/o.speed
            , ostep = (1-o.opacity) / (f*o.trail / 100)
            , astep = f/o.lines
  
          ;(function anim() {
            i++;
            for (var j = 0; j < o.lines; j++) {
              alpha = Math.max(1 - (i + (o.lines - j) * astep) % f * ostep, o.opacity);
  
              self.opacity(el, j * o.direction + start, alpha, o)
            }
            self.timeout = self.el && setTimeout(anim, ~~(1000/fps))
          })()
        }
        return self
      },
  
      /**
       * Stops and removes the Spinner.
       */
      stop: function() {
        var el = this.el;
        if (el) {
          clearTimeout(this.timeout);
          if (el.parentNode) el.parentNode.removeChild(el);
          this.el = undefined
        }
        return this
      },
  
      /**
       * Internal method that draws the individual lines. Will be overwritten
       * in VML fallback mode below.
       */
      lines: function(el, o) {
        var i = 0
          , start = (o.lines - 1) * (1 - o.direction) / 2
          , seg;
  
        function fill(color, shadow) {
          return css(createEl(), {
            position: 'absolute',
            width: (o.length+o.width) + 'px',
            height: o.width + 'px',
            background: color,
            boxShadow: shadow,
            transformOrigin: 'left',
            transform: 'rotate(' + ~~(360/o.lines*i+o.rotate) + 'deg) translate(' + o.radius+'px' +',0)',
            borderRadius: (o.corners * o.width>>1) + 'px'
          })
        }
  
        for (; i < o.lines; i++) {
          seg = css(createEl(), {
            position: 'absolute',
            top: 1+~(o.width/2) + 'px',
            transform: o.hwaccel ? 'translate3d(0,0,0)' : '',
            opacity: o.opacity,
            animation: useCssAnimations && addAnimation(o.opacity, o.trail, start + i * o.direction, o.lines) + ' ' + 1/o.speed + 's linear infinite'
          });
  
          if (o.shadow) ins(seg, css(fill('#000', '0 0 4px ' + '#000'), {top: 2+'px'}));
          ins(el, ins(seg, fill(getColor(o.color, i), '0 0 1px rgba(0,0,0,.1)')))
        }
        return el
      },
  
      /**
       * Internal method that adjusts the opacity of a single line.
       * Will be overwritten in VML fallback mode below.
       */
      opacity: function(el, i, val) {
        if (i < el.childNodes.length) el.childNodes[i].style.opacity = val
      }
  
    });
  
  
    function initVML() {
  
      /* Utility function to create a VML tag */
      function vml(tag, attr) {
        return createEl('<' + tag + ' xmlns="urn:schemas-microsoft.com:vml" class="spin-vml">', attr)
      }
  
      // No CSS transforms but VML support, add a CSS rule for VML elements:
      sheet.addRule('.spin-vml', 'behavior:url(#default#VML)');
  
      Spinner.prototype.lines = function(el, o) {
        var r = o.length+o.width
          , s = 2*r;
  
        function grp() {
          return css(
            vml('group', {
              coordsize: s + ' ' + s,
              coordorigin: -r + ' ' + -r
            }),
            { width: s, height: s }
          )
        }
  
        var margin = -(o.width+o.length)*2 + 'px'
          , g = css(grp(), {position: 'absolute', top: margin, left: margin})
          , i;
  
        function seg(i, dx, filter) {
          ins(g,
            ins(css(grp(), {rotation: 360 / o.lines * i + 'deg', left: ~~dx}),
              ins(css(vml('roundrect', {arcsize: o.corners}), {
                  width: r,
                  height: o.width,
                  left: o.radius,
                  top: -o.width>>1,
                  filter: filter
                }),
                vml('fill', {color: getColor(o.color, i), opacity: o.opacity}),
                vml('stroke', {opacity: 0}) // transparent stroke to fix color bleeding upon opacity change
              )
            )
          )
        }
  
        if (o.shadow)
          for (i = 1; i <= o.lines; i++)
            seg(i, -2, 'progid:DXImageTransform.Microsoft.Blur(pixelradius=2,makeshadow=1,shadowopacity=.3)')
  
        for (i = 1; i <= o.lines; i++) seg(i)
        return ins(el, g)
      };
  
      Spinner.prototype.opacity = function(el, i, val, o) {
        var c = el.firstChild;
        o = o.shadow && o.lines || 0;
        if (c && i+o < c.childNodes.length) {
          c = c.childNodes[i+o]; c = c && c.firstChild; c = c && c.firstChild;
          if (c) c.opacity = val
        }
      }
    }
  
    var probe = css(createEl('group'), {behavior: 'url(#default#VML)'});
  
    if (!vendor(probe, 'transform') && probe.adj) initVML();
    else useCssAnimations = vendor(probe, 'animation');
  
    return Spinner
  
  }));
  