   constructor: (@elementSelector) ->
     @value = 0
     @opacity = 1
+    @content = ''
     @speed = 300
     @install()
 

    @speed = originalSpeed
    result

  _updateStyle: =>
    @styleElement.textContent = @_createCSSRule()

  _createCSSRule: ->
    """
    #{@elementSelector}.#{className}::before {
      content: '';
      position: fixed;
      top: 0;
      left: 0;

    setTimeout =>
      @value = 0
      @opacity = 1
      @_withSpeed(0, => @_updateStyle(true))
    , @speed

  _startTrickle: ->
