Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

+ add another resource

JavaScript

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

Behavior

Auto Save

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                <blockquote>
	<p>“Teach the ignorant as much as you can; society is culpable in not providing a free education for all and it must answer for the night which it produces. If the soul is left in darkness sins will be committed. The guilty one is not he who commits the sin, but he who causes the darkness.”</p>
	<cite>Victor Hugo - Les Miserables</cite>
</blockquote>
              
            
!

CSS

              
                blockquote {
	width: 90vw;
	margin: 45px auto;
	
	@media screen and (min-width: 544px) {
		width: 50vw;
		min-width: 500px;
	}
	
	p {
		font-size: 28px;
		font-family: serif;
		hanging-punctuation: first;
	}
	
	cite {
		font-size: 21px;
		float: right;
		font-family: serif;
	}
}
              
            
!

JS

              
                /* Polyfill.js */
/*!
 * Polyfill.js - v0.1.0
 *
 * Copyright (c) 2015 Philip Walton <http://philipwalton.com>
 * Released under the MIT license
 *
 * Date: 2015-06-21
 */
;(function(window, document, undefined){

'use strict';

var reNative = RegExp('^' +
  String({}.valueOf)
    .replace(/[.*+?\^${}()|\[\]\\]/g, '\\$&')
    .replace(/valueOf|for [^\]]+/g, '.+?') + '$'
)


/**
 * Trim any leading or trailing whitespace
 */
function trim(s) {
  return s.replace(/^\s+|\s+$/g,'')
}


/**
 * Detects the presence of an item in an array
 */
function inArray(target, items) {
  var item
    , i = 0
  if (!target || !items) return false
  while(item = items[i++]) {
    if (target === item) return true
  }
  return false
}


/**
 * Determine if a method is support natively by the browser
 */
function isNative(fn) {
  return reNative.test(fn)
}

/**
 * Determine if a URL is local to the document origin
 * Inspired form Respond.js
 * https://github.com/scottjehl/Respond/blob/master/respond.src.js#L90-L91
 */
var isLocalURL = (function() {
  var base = document.getElementsByTagName("base")[0]
    , reProtocol = /^([a-zA-Z:]*\/\/)/
  return function(url) {
    var isLocal = (!reProtocol.test(url) && !base)
      || url.replace(RegExp.$1, "").split("/")[0] === location.host
    return isLocal
  }
}())

var supports = {
  // true with either native support or a polyfil, we don't care which
  matchMedia: window.matchMedia && window.matchMedia( "only all" ).matches,
  // true only if the browser supports window.matchMeida natively
  nativeMatchMedia: isNative(window.matchMedia)
}

var DownloadManager = (function() {

  var cache = {}
    , queue = []
    , callbacks = []
    , requestCount = 0
    , xhr = (function() {
        var method
        try { method = new window.XMLHttpRequest() }
        catch (e) { method = new window.ActiveXObject( "Microsoft.XMLHTTP" ) }
        return method
      }())

  // return function(urls, callback) {

  function addURLsToQueue(urls) {
    var url
      , i = 0
    while (url = urls[i++]) {
      if (!cache[url] && !inArray(url, queue)) {
        queue.push(url)
      }
    }
  }

  function processQueue() {
    // don't process the next one if we're in the middle of a download
    if (!(xhr.readyState === 0 || xhr.readyState === 4)) return

    var url
    if (url = queue[0]) {
      downloadStylesheet(url)
    }
    if (!url) {
      invokeCallbacks()
    }
  }

  /**
   * Make the requests
   *
   * TODO: Get simultaneous downloads working, it can't be that hard
  */
  function downloadStylesheet(url) {
    requestCount++
    xhr.open("GET", url, true)
    xhr.onreadystatechange = function () {
      if (xhr.readyState == 4 && (xhr.status == 200 || xhr.status == 304)) {
        cache[url] = xhr.responseText
        queue.shift()
        processQueue()
      }
    }
    xhr.send(null)
  }

  /**
   * Check the cache to make sure all requests are complete
   */
  function downloadsFinished(urls) {
    var url
      , i = 0
      , len = 0
    while (url = urls[i++]) {
      if (cache[url]) len++
    }
    return (len === urls.length)
  }

  /**
   * Invoke each callback and remove it from the list
   */
  function invokeCallbacks() {
    var callback
    while (callback = callbacks.shift()) {
      invokeCallback(callback.urls, callback.fn)
    }
  }

  /**
   * Put the stylesheets in the proper order and invoke the callback
   */
  function invokeCallback(urls, callback) {
    var stylesheets = []
      , url
      , i = 0
    while (url = urls[i++]) {
      stylesheets.push(cache[url])
    }
    callback.call(null, stylesheets)
  }

  return {
    request: function(urls, callback) {
      // Add the callback to the list
      callbacks.push({urls: urls, fn: callback})

      if (downloadsFinished(urls)) {
        invokeCallbacks()
      } else {
        addURLsToQueue(urls)
        processQueue()
      }
    },
    clearCache: function() {
      cache = {}
    },
    _getRequestCount: function() {
      return requestCount
    }
  }

}())

var StyleManager = {

  _cache: {},

  clearCache: function() {
    StyleManager._cache = {}
  },

  /**
   * Parse a string of CSS
   * optionaly pass an identifier for caching
   *
   * Adopted from TJ Holowaychuk's
   * https://github.com/visionmedia/css-parse
   *
   * Minor changes include removing the "stylesheet" root and
   * using String.charAt(i) instead of String[i] for IE7 compatibility
   */
  parse: function(css, identifier) {

    /**
     * Opening brace.
     */
    function open() {
      return match(/^\{\s*/)
    }

    /**
     * Closing brace.
     */
    function close() {
      return match(/^\}\s*/)
    }

    /**
     * Parse ruleset.
     */
    function rules() {
      var node
      var rules = []
      whitespace()
      comments(rules)
      while (css.charAt(0) != '}' && (node = atrule() || rule())) {
        rules.push(node)
        comments(rules)
      }
      return rules
    }

    /**
     * Match `re` and return captures.
     */
    function match(re) {
      var m = re.exec(css)
      if (!m) return
      css = css.slice(m[0].length)
      return m
    }

    /**
     * Parse whitespace.
     */
    function whitespace() {
      match(/^\s*/)
    }

    /**
     * Parse comments
     */
    function comments(rules) {
      rules = rules || []
      var c
      while (c = comment()) rules.push(c)
      return rules
    }

    /**
     * Parse comment.
     */
    function comment() {
      if ('/' == css[0] && '*' == css[1]) {
        var i = 2
        while ('*' != css[i] || '/' != css[i + 1]) ++i
        i += 2
        var comment = css.slice(2, i - 2)
        css = css.slice(i)
        whitespace()
        return { comment: comment }
      }
    }

    /**
     * Parse selector.
     */
    function selector() {
      var m = match(/^([^{]+)/)
      if (!m) return
      return trim(m[0]).split(/\s*,\s*/)
    }

    /**
     * Parse declaration.
     */
    function declaration() {
      // prop
      var prop = match(/^(\*?[\-\w]+)\s*/)
      if (!prop) return
      prop = prop[0]

      // :
      if (!match(/^:\s*/)) return

      // val
      var val = match(/^((?:'(?:\\'|.)*?'|"(?:\\"|.)*?"|\([^\)]*?\)|[^};])+)\s*/)
      if (!val) return
      val = trim(val[0])

      //
      match(/^[;\s]*/)

      return { property: prop, value: val }
    }

    /**
     * Parse keyframe.
     */
    function keyframe() {
      var m
      var vals = []

      while (m = match(/^(from|to|\d+%|\.\d+%|\d+\.\d+%)\s*/)) {
        vals.push(m[1])
        match(/^,\s*/)
      }

      if (!vals.length) return

      return {
        values: vals,
        declarations: declarations()
      }
    }

    /**
     * Parse keyframes.
     */
    function keyframes() {
      var m = match(/^@([\-\w]+)?keyframes */)
      if (!m) return
      var vendor = m[1]

      // identifier
      var m = match(/^([\-\w]+)\s*/)
      if (!m) return
      var name = m[1]

      if (!open()) return
      comments()

      var frame
      var frames = []
      while (frame = keyframe()) {
        frames.push(frame)
        comments()
      }

      if (!close()) return

      var obj = {
        name: name,
        keyframes: frames
      }
      // don't include vendor unles there's a match
      if (vendor) obj.vendor = vendor

      return obj
    }

    /**
     * Parse supports.
     */
    function supports() {
      var m = match(/^@supports *([^{]+)/)
      if (!m) return
      var supports = trim(m[1])

      if (!open()) return
      comments()

      var style = rules()

      if (!close()) return

      return { supports: supports, rules: style }
    }

    /**
     * Parse media.
     */
    function media() {
      var m = match(/^@media *([^{]+)/)
      if (!m) return

      var media = trim(m[1])

      if (!open()) return
      comments()

      var style = rules()

      if (!close()) return

      return { media: media, rules: style }
    }


    /**
     * Parse paged media.
     */
    function atpage() {
      var m = match(/^@page */)
      if (!m) return

      var sel = selector() || []
      var decls = []

      if (!open()) return
      comments()

      // declarations
      var decl
      while (decl = declaration() || atmargin()) {
        decls.push(decl)
        comments()
      }

      if (!close()) return

      return {
        type: "page",
        selectors: sel,
        declarations: decls
      }
    }

    /**
     * Parse margin at-rules
     */
    function atmargin() {
      var m = match(/^@([a-z\-]+) */)
      if (!m) return
      var type = m[1]

      return {
        type: type,
        declarations: declarations()
      }
    }

    /**
     * Parse import
     */
    function atimport() {
      return _atrule('import')
    }

    /**
     * Parse charset
     */
    function atcharset() {
      return _atrule('charset')
    }

    /**
     * Parse namespace
     */
    function atnamespace() {
      return _atrule('namespace')
    }

    /**
     * Parse non-block at-rules
     */
    function _atrule(name) {
      var m = match(new RegExp('^@' + name + ' *([^;\\n]+);\\s*'))
      if (!m) return
      var ret = {}
      ret[name] = trim(m[1])
      return ret
    }

    /**
     * Parse declarations.
     */
    function declarations() {
      var decls = []

      if (!open()) return
      comments()

      // declarations
      var decl
      while (decl = declaration()) {
        decls.push(decl)
        comments()
      }

      if (!close()) return
      return decls
    }

    /**
     * Parse at rule.
     */
    function atrule() {
      return keyframes()
        || media()
        || supports()
        || atimport()
        || atcharset()
        || atnamespace()
        || atpage()
    }

    /**
     * Parse rule.
     */
    function rule() {
      var sel = selector()
      if (!sel) return
      comments()
      return { selectors: sel, declarations: declarations() }
    }

    /**
     * Check the cache first, otherwise parse the CSS
     */
    if (identifier && StyleManager._cache[identifier]) {
      return StyleManager._cache[identifier]
    } else {
      // strip comments before parsing
      css = css.replace(/\/\*[\s\S]*?\*\//g, "")
      return StyleManager._cache[identifier] = rules()
    }

  },

  /**
   * Filter a ruleset by the passed keywords
   * Keywords may be either selector or property/value patterns
   */
  filter: function(rules, keywords) {

    var filteredRules = []

    /**
     * Concat a2 onto a1 even if a1 is undefined
     */
    function safeConcat(a1, a2) {
      if (!a1 && !a2) return
      if (!a1) return [a2]
      return a1.concat(a2)
    }

    /**
     * Add a rule to the filtered ruleset,
     * but don't add empty media or supports values
     */
    function addRule(rule) {
      if (rule.media == null) delete rule.media
      if (rule.supports == null) delete rule.supports
      filteredRules.push(rule)
    }

    function containsKeyword(string, keywordList) {
      if (!keywordList) return
      var i = keywordList.length
      while (i--) {
        if (string.indexOf(keywordList[i]) >= 0) return true
      }
    }

    function matchesKeywordPattern(declaration, patternList) {
      var wildcard = /\*/
        , pattern
        , parts
        , reProp
        , reValue
        , i = 0
      while (pattern = patternList[i++]) {
        parts = pattern.split(":")
        reProp = new RegExp("^" + trim(parts[0]).replace(wildcard, ".*") + "$")
        reValue = new RegExp("^" + trim(parts[1]).replace(wildcard, ".*") + "$")
        if (reProp.test(declaration.property) && reValue.test(declaration.value)) {
          return true
        }
      }
    }

    function matchSelectors(rule, media, supports) {
      if (!keywords.selectors) return

      if (containsKeyword(rule.selectors.join(","), keywords.selectors)) {
        addRule({
          media: media,
          supports: supports,
          selectors: rule.selectors,
          declarations: rule.declarations
        })
        return true
      }
    }

    function matchesDeclaration(rule, media, supports) {
      if (!keywords.declarations) return
      var declaration
        , i = 0
      while (declaration = rule.declarations[i++]) {
        if (matchesKeywordPattern(declaration, keywords.declarations)) {
          addRule({
            media: media,
            supports: supports,
            selectors: rule.selectors,
            declarations: rule.declarations
          })
          return true
        }
      }
    }

    function filterRules(rules, media, supports) {
      var rule
        , i = 0
      while (rule = rules[i++]) {
        if (rule.declarations) {
          matchSelectors(rule, media, supports) || matchesDeclaration(rule, media, supports)
        }
        else if (rule.rules && rule.media) {
          filterRules(rule.rules, safeConcat(media, rule.media), supports)
        }
        else if (rule.rules && rule.supports) {
          filterRules(rule.rules, media, safeConcat(supports, rule.supports))
        }
      }

    }

    // start the filtering
    filterRules(rules)

    // return the results
    return filteredRules

  }
}
var MediaManager = (function() {

  var reMinWidth = /\(min\-width:[\s]*([\s]*[0-9\.]+)(px|em)[\s]*\)/
    , reMaxWidth = /\(max\-width:[\s]*([\s]*[0-9\.]+)(px|em)[\s]*\)/

    // a cache of the active media query info
    , mediaQueryMap = {}

    // the value of an `em` as used in a media query,
    // not necessarily the base font-size
    , emValueInPixels
    , currentWidth

  /**
   * Get the pixel value of 1em for use in parsing media queries
   * ems in media queries are not affected by CSS, instead they
   * are the value of the browsers default font size, usually 16px
   */
  function getEmValueInPixels() {

    // cache this value because it probably won't change and
    // it's expensive to lookup
    if (emValueInPixels) return emValueInPixels

    var html = document.documentElement
      , body = document.body
      , originalHTMLFontSize = html.style.fontSize
      , originalBodyFontSize = body.style.fontSize
      , div = document.createElement("div")

    // 1em is the value of the default font size of the browser
    // reset html and body to ensure the correct value is returned
    html.style.fontSize = "1em"
    body.style.fontSize = "1em"

    // add a test element and measure it
    body.appendChild(div)
    div.style.width = "1em"
    div.style.position = "absolute"
    emValueInPixels = div.offsetWidth

    // remove the test element and restore the previous values
    body.removeChild(div)
    body.style.fontSize = originalBodyFontSize
    html.style.fontSize = originalHTMLFontSize

    return emValueInPixels
  }

  /**
   * Use the browsers matchMedia function or existing shim
   */
  function matchMediaNatively(query) {
    return window.matchMedia(query)
  }

  /**
   * Try to determine if a mediaQuery matches by
   * parsing the query and figuring it out manually
   * TODO: cache current width for repeated invocations
   */
  function matchMediaManually(query) {
    var minWidth
      , maxWidth
      , matches = false

    // recalculate the width if it's not set
    // if (!currentWidth) currentWidth = document.documentElement.clientWidth
    currentWidth = document.documentElement.clientWidth

    // parse min and max widths from query
    if (reMinWidth.test(query)) {
      minWidth = RegExp.$2 === "em"
        ? parseFloat(RegExp.$1) * getEmValueInPixels()
        : parseFloat(RegExp.$1)
    }
    if (reMaxWidth.test(query)) {
      maxWidth = RegExp.$2 === "em"
        ? parseFloat(RegExp.$1) * getEmValueInPixels()
        : parseFloat(RegExp.$1)
    }

    // if both minWith and maxWidth are set
    if (minWidth && maxWidth) {
      matches = (minWidth <= currentWidth && maxWidth >= currentWidth)
    } else {
      if (minWidth && minWidth <= currentWidth) matches = true
      if (maxWidth && maxWidth >= currentWidth) matches = true
    }

    // return fake MediaQueryList object
    return {
      matches: matches,
      media: query
    }
  }


  return {
    /**
     * Similar to the window.matchMedia method
     * results are cached to avoid expensive relookups
     * @returns MediaQueryList (or a faked one)
     */
    matchMedia: function(query) {
      return supports.matchMedia
          ? matchMediaNatively(query)
          : matchMediaManually(query)
      // return mediaQueryMap[query] || (
      //   mediaQueryMap[query] = supports.matchMedia
      //     ? matchMediaNatively(query)
      //     : matchMediaManually(query)
      // )
    },

    clearCache: function() {
      // we don't use cache when the browser supports matchMedia listeners
      if (!supports.nativeMatchMedia) {
        currentWidth = null
        mediaQueryMap = {}
      }
    }
  }

}())

var EventManager = (function() {

  var MediaListener = (function() {
    var listeners = []
    return {
      add: function(polyfill, mql, fn) {
        var listener
          , i = 0
        // if the listener is already in the array, return false
        while (listener = listeners[i++]) {
          if (
            listener.polyfill == polyfill
            && listener.mql === mql
            && listener.fn === fn
          ) {
            return false
          }
        }
        // otherwise add it
        mql.addListener(fn)
        listeners.push({
          polyfill: polyfill,
          mql: mql,
          fn: fn
        })
      },
      remove: function(polyfill) {
        var listener
          , i = 0
        while (listener = listeners[i++]) {
          if (listener.polyfill === polyfill) {
            listener.mql.removeListener(listener.fn)
            listeners.splice(--i, 1)
          }
        }
      }
    }
  }())

  var ResizeListener = (function(listeners) {
    function onresize() {
      var listener
        , i = 0
      while (listener = listeners[i++]) {
        listener.fn()
      }
    }
    return {
      add: function(polyfill, fn) {
        if (!listeners.length) {
          if (window.addEventListener) {
            window.addEventListener("resize", onresize, false)
          } else {
            window.attachEvent("onresize", onresize)
          }
        }
        listeners.push({
          polyfill: polyfill,
          fn: fn
        })

      },
      remove: function(polyfill) {
        var listener
          , i = 0
        while (listener = listeners[i++]) {
          if (listener.polyfill === polyfill) {
            listeners.splice(--i, 1)
          }
        }
        if (!listeners.length) {
          if (window.removeEventListener) {
            window.removeEventListener("resize", onresize, false)
          } else if (window.detachEvent) {
            window.detachEvent("onresize", onresize)
          }
        }
      }
    }
  }([]))


  /**
   * Simple debounce function
   */
  function debounce(fn, wait) {
    var timeout
    return function() {
      clearTimeout(timeout)
      timeout = setTimeout(fn, wait)
    }
  }

  return {

    removeListeners: function(polyfill) {
      supports.nativeMatchMedia
        ? MediaListener.remove(polyfill)
        : ResizeListener.remove(polyfill)
    },

    addListeners: function(polyfill, callback) {

      var queries = polyfill._mediaQueryMap
        , state = {}


      /**
       * Set up initial state
       */
      ;(function() {
        for (var query in queries) {
          if (!queries.hasOwnProperty(query)) continue
          state[query] = MediaManager.matchMedia(query).matches
        }
      }())

      /**
       * Register the listeners to detect media query changes
       * if the browser doesn't support this natively, use resize events instead
       */
      function addListeners() {

        if (supports.nativeMatchMedia) {
          for (var query in queries) {
            if (queries.hasOwnProperty(query)) {
              // a closure is needed here to keep the variable reference
              (function(mql, query) {
                MediaListener.add(polyfill, mql, function() {
                  callback.call(polyfill, query, mql.matches)
                })
              }(queries[query], query))
            }
          }
        } else {

          var fn = debounce((function(polyfill, queries) {
            return function() {
              updateMatchedMedia(polyfill, queries)
            }
          }(polyfill, queries)), polyfill._options.debounceTimeout || 100)

          ResizeListener.add(polyfill, fn)

        }
      }

      /**
       * Check each media query to see if it still matches
       * Note: this is only invoked when the browser doesn't
       * natively support window.matchMedia addListeners
       */
      function updateMatchedMedia(polyfill, queries) {
        var query
          , current = {}

        // clear the cache since a resize just happened
        MediaManager.clearCache()

        // look for media matches that have changed since the last inspection
        for (query in queries) {
          if (!queries.hasOwnProperty(query)) continue
          current[query] = MediaManager.matchMedia(query).matches
          if (current[query] != state[query]) {
            callback.call(polyfill, query, MediaManager.matchMedia(query).matches)
          }
        }
        state = current
      }

      addListeners()

    }

  }

}())

function Ruleset(rules) {
  var i = 0
    , rule
  this._rules = []
  while (rule = rules[i++]) {
    this._rules.push(new Rule(rule))
  }
}

Ruleset.prototype.each = function(iterator, context) {
  var rule
    , i = 0
  context || (context = this)
  while (rule = this._rules[i++]) {
    iterator.call(context, rule)
  }
}

Ruleset.prototype.size = function() {
  return this._rules.length
}

Ruleset.prototype.at = function(index) {
  return this._rules[index]
}

function Rule(rule) {
  this._rule = rule
}

Rule.prototype.getDeclaration = function() {
  var styles = {}
    , i = 0
    , declaration
    , declarations = this._rule.declarations
  while (declaration = declarations[i++]) {
    styles[declaration.property] = declaration.value
  }
  return styles
}

Rule.prototype.getSelectors = function() {
  return this._rule.selectors.join(", ")
}

Rule.prototype.getMedia = function() {
  return this._rule.media.join(" and ")
}

function Polyfill(options) {

  if (!(this instanceof Polyfill)) return new Polyfill(options)

  // set the options
  this._options = options

  // allow the keywords option to be the only object passed
  if (!options.keywords) this._options = { keywords: options }

  this._promise = []

  // then do the stuff
  this._getStylesheets()
  this._downloadStylesheets()
  this._parseStylesheets()
  this._filterCSSByKeywords()
  this._buildMediaQueryMap()
  this._reportInitialMatches()
  this._addMediaListeners()
}


/**
 * Fired when the media change and new rules match
 */
Polyfill.prototype.doMatched = function(fn) {
  this._doMatched = fn
  this._resolve()
  return this
}


/**
 * Fired when the media changes and previously matching rules no longer match
 */
Polyfill.prototype.undoUnmatched = function(fn) {
  this._undoUnmatched = fn
  this._resolve()
  return this
}


/**
 * Get all the rules the match the current media
 */
Polyfill.prototype.getCurrentMatches = function() {
  var i = 0
    , rule
    , media
    , matches = []
  while (rule = this._filteredRules[i++]) {
    // rules are considered matches if they they have
    // no media query or the media query curently matches
    media = rule.media && rule.media.join(" and ")
    if (!media || MediaManager.matchMedia(media).matches) {
      matches.push(rule)
    }
  }
  return new Ruleset(matches)
}


/**
 * Destroy the instance
 * Remove any bound events and send all current
 * matches to the callback as unmatches
 */
Polyfill.prototype.destroy = function() {
  if (this._undoUnmatched) {
    this._undoUnmatched(this.getCurrentMatches())
    EventManager.removeListeners(this)
  }
  return
}


/**
 * Defer a task until after a condition is met
 */
Polyfill.prototype._defer = function(condition, callback) {
  condition.call(this)
    ? callback.call(this)
    : this._promise.push({condition: condition, callback: callback})
}


/**
 * Invoke any functions that have been deferred
 */
Polyfill.prototype._resolve = function() {
  var promise
    , i = 0
  while (promise = this._promise[i]) {
    if (promise.condition.call(this)) {
      this._promise.splice(i, 1)
      promise.callback.call(this)
    } else {
      i++
    }
  }
}


/**
 * Get a list of <link> tags in the head
 * optionally filter by the include/exclude options
 */
Polyfill.prototype._getStylesheets = function() {
  var i = 0
    , id
    , ids
    , link
    , links
    , inline
    , inlines
    , stylesheet
    , stylesheets = []

  if (this._options.include) {
    // get only the included stylesheets link tags
    ids = this._options.include
    while (id = ids[i++]) {
      if (link = document.getElementById(id)) {
        // if this tag is an inline style
        if (link.nodeName === "STYLE") {
          stylesheet = { text: link.textContent }
          stylesheets.push(stylesheet)
          continue
        }
        // ignore print stylesheets
        if (link.media && link.media == "print") continue
        // ignore non-local stylesheets
        if (!isLocalURL(link.href)) continue
        stylesheet = { href: link.href }
        link.media && (stylesheet.media = link.media)
        stylesheets.push(stylesheet)
      }
    }
  }
  else {
    // otherwise get all the stylesheets stylesheets tags
    // except the explicitely exluded ones
    ids = this._options.exclude
    links = document.getElementsByTagName( "link" )
    while (link = links[i++]) {
      if (
        link.rel
        && (link.rel == "stylesheet")
        && (link.media != "print") // ignore print stylesheets
        && (isLocalURL(link.href)) // only request local stylesheets
        && (!inArray(link.id, ids))
      ) {
        stylesheet = { href: link.href }
        link.media && (stylesheet.media = link.media)
        stylesheets.push(stylesheet)
      }
    }
    inlines = document.getElementsByTagName('style');
    i = 0;
    while (inline = inlines[i++]){
      stylesheet = { text: inline.textContent }
      stylesheets.push(stylesheet);
    }
  }
  return this._stylesheets = stylesheets
}


/**
 * Download each stylesheet in the _stylesheetURLs array
 */
Polyfill.prototype._downloadStylesheets = function() {
  var self = this
    , stylesheet
    , urls = []
    , i = 0
  while (stylesheet = this._stylesheets[i++]) {
    urls.push(stylesheet.href)
  }
  DownloadManager.request(urls, function(stylesheets) {
    var stylesheet
      , i = 0
    while (stylesheet = stylesheets[i]) {
      self._stylesheets[i++].text = stylesheet
    }
    self._resolve()
  })
}

Polyfill.prototype._parseStylesheets = function() {
  this._defer(
    function() {
      return this._stylesheets
        && this._stylesheets.length
        && this._stylesheets[0].text },
    function() {
      var i = 0
        , stylesheet
      while (stylesheet = this._stylesheets[i++]) {
        stylesheet.rules = StyleManager.parse(stylesheet.text, stylesheet.url)
      }
    }
  )
}

Polyfill.prototype._filterCSSByKeywords = function() {
  this._defer(
    function() {
      return this._stylesheets
        && this._stylesheets.length
        && this._stylesheets[0].rules
    },
    function() {
      var stylesheet
        , media
        , rules = []
        , i = 0
      while (stylesheet = this._stylesheets[i++]) {
        media = stylesheet.media
        // Treat stylesheets with a media attribute as being contained inside
        // a single @media block, but ignore `all` and `screen` media values
        // since they're basically meaningless in this context
        if (media && media != "all" && media != "screen") {
          rules.push({rules: stylesheet.rules, media: stylesheet.media})
        } else {
          rules = rules.concat(stylesheet.rules)
        }
      }
      this._filteredRules = StyleManager.filter(rules, this._options.keywords)
    }
  )
}

Polyfill.prototype._buildMediaQueryMap = function() {
  this._defer(
    function() { return this._filteredRules },
    function() {
      var i = 0
        , media
        , rule
      this._mediaQueryMap = {}
      while (rule = this._filteredRules[i++]) {
        if (rule.media) {
          media = rule.media.join(" and ")
          this._mediaQueryMap[media] = MediaManager.matchMedia(media)
        }
      }
    }
  )
}

Polyfill.prototype._reportInitialMatches = function() {
  this._defer(
    function() {
      return this._filteredRules && this._doMatched
    },
    function() {
      this._doMatched(this.getCurrentMatches())
    }
  )
}

Polyfill.prototype._addMediaListeners = function() {
  this._defer(
    function() {
      return this._filteredRules
        && this._doMatched
        && this._undoUnmatched
    },
    function() {
      EventManager.addListeners(
        this,
        function(query, isMatch) {
          var i = 0
            , rule
            , matches = []
            , unmatches = []
          while (rule = this._filteredRules[i++]) {
            if (rule.media && rule.media.join(" and ") == query) {
              (isMatch ? matches : unmatches).push(rule)
            }
          }
          matches.length && this._doMatched(new Ruleset(matches))
          unmatches.length && this._undoUnmatched(new Ruleset(unmatches))
        }
      )
    }
  )
}

Polyfill.modules = {
  DownloadManager: DownloadManager,
  StyleManager: StyleManager,
  MediaManager: MediaManager,
  EventManager: EventManager
}
Polyfill.constructors = {
  Ruleset: Ruleset,
  Rule: Rule
}

window.Polyfill = Polyfill

}(window, document));





/* gosh-hang-it.js */
(function(window, document, undefined) {

  // Enable strict mode; no shirking or loafing permitted
  "use strict";

  // Array of hangable punctuation characters
  var hangables = ['\'', '"', '‘', '’', '“', '”', ',', '.', '،', '۔', '、', '。', ',', '.', '﹐', '﹑', '﹒', '。', '、', '«', '»'];

  // Don't wrap characters in tags that contain non-display text
  var disallowedNodes = ['title', 'head', 'script', 'style'];

  // Monolithic objecty thing
  var gosh = {};

  // Array of Hangable objects will live here
  gosh.chars = [];

  gosh.wrapHangables = function(el) {
    // Wrap hangable characters in an easily queryable and styleable span

    // but first make sure that we're not after a non-hangable node
    if (disallowedNodes.indexOf(el.nodeName.toLowerCase()) != -1) {
      return false;
    }

    var nodes = el.childNodes;

    for (var i = 0; i < nodes.length; ++i) {
      var node = nodes[i];

      if(node.nodeType == 1) {
        // Recurse elements: gotta get to the juicy text nodes inside the HTML
        gosh.wrapHangables(node);
      } else if(node.nodeType == 3) {
        gosh.wrapCharactersInTextNode(node);
      }
    }

    gosh.trimEmptyWrappers();
  }

  gosh.wrapCharactersInTextNode = function(node) {
    // For text nodes, wrap the hangable characters in spans and then wrap
    // that whole mess in another span so we can operate upon it in HTML

    var text = node.textContent,
        temp = document.createElement('span'),
        matchChars = new RegExp('[' + hangables.join('|') + ']', 'g');

    text = text.replace(matchChars, function(match) {
      return '<span data-hang>' + match + '</span>';
    });

    temp.setAttribute('data-hang-wrapper', 'true');
    temp.innerHTML = text;

    node.parentNode.insertBefore(temp, node);
    node.parentNode.removeChild(node);
  }

  gosh.trimEmptyWrappers = function() {
    var empties = document.querySelectorAll( '[data-hang-wrapper]' );

    for (var i = 0; i < empties.length; ++i) {
      var empty = empties[i];

      if (empty.innerHTML.match(/^\s*$/)) {
        empty.remove();
      }
    }
  }

  gosh.unwrapHangables = function(el) {
    // Unwrap hangable characters to get the DOM mostly back to normal

    var nodes = el.childNodes;
    console.log(nodes);
  }

  gosh.instantiateHangables = function() {
    // Make a new Hangable object to manage each hangable character

    var chars = document.querySelectorAll('[data-hang]');

    for (var i = 0; i < chars.length; ++i) {
      var char = chars[i];

      var hangable = new Hangable(char);
    }
  }

  gosh.doMatched = function(rules) {
    rules.each(function(rule) {
      var matchedEl = document.querySelectorAll( rule.getSelectors() )[0];

      if(matchedEl) {
        gosh.wrapHangables(matchedEl);
        gosh.instantiateHangables();
      }
    });
  }

  gosh.unhangAll = function(rules) {
    gosh.chars.forEach(function(char) {
      char.unhang().destroy();
    });
  }

  // Hangable object
  function Hangable(el) {
    this.el = el;
    this.container = this.getFirstBlockParent();
    this.wrapper = this.container.querySelector('[data-hang-wrapper]');

    gosh.chars.push(this);

    this.hang();
  }

  Hangable.prototype.getFirstBlockParent = function() {
    var el = this.el;

    // Loop through parent nodes until we find a block, or close enough
    while (el.parentNode) {
      el = el.parentNode;
      var display = getComputedStyle(el).display;

      if (display == "block" || display == "flex" || display == "grid") {
        return el;
      }
    }
  }

  Hangable.prototype.getRelativePosition = function() {
    var containerOffset, elOffset;

    containerOffset = this.getContainerTrueOffset();
    elOffset = this.el.offsetLeft;

    this.el.setAttribute('data-hang-position', elOffset - containerOffset);
    return elOffset - containerOffset;
  }

  Hangable.prototype.getRelativeWidth = function() {
    return (this.el.offsetWidth / this.getContainerWidth());
  }

  Hangable.prototype.hang = function() {
    this.el.style.marginLeft = '';

    if (this.getRelativePosition() == 0 && this.el === this.wrapper.firstElementChild) {
      this.el.style.marginLeft = (-100 * this.getRelativeWidth()) + '%';

      return true;
    }

    return false;
  }

  Hangable.prototype.unhang = function() {
    // get the element's parent node
    var parent = this.el.parentNode;

    // move all children out of the element
    while (this.el.firstChild) parent.insertBefore(this.el.firstChild, this.el);

    // remove the empty element
    parent.removeChild(this.el);

    return this;
  }

  Hangable.prototype.destroy = function() {
    delete this;
  }

  Hangable.prototype.getContainerTrueOffset = function() {
    // Get the container's offset, minus borders or any other interloping spaces

    var containerOffset = this.container.offsetLeft + this.container.clientLeft;
    return containerOffset;
  }

  Hangable.prototype.getContainerWidth = function() {
    return this.container.clientWidth;
  }

  // Set up the polyfill
  window.onload = function() {
    Polyfill({
      declarations: ["hanging-punctuation:first"]
    })
    .doMatched(gosh.doMatched)
    .undoUnmatched(gosh.unhangAll);
  }

  // Make it Responsive(tm)
  window.onresize = function() {
    gosh.chars.forEach(function(char) {
      char.hang();
    });
  }

  // Export this whole thing at the end
  window.goshHangIt = gosh;

})(window, document);
              
            
!
999px

Console