text: var CLASS = c3_chart_internal_fn.CLASS = {
      target: 'c3-target',
      chart: 'c3-chart',
      chartLine: 'c3-chart-line',
      chartLines: 'c3-chart-lines',
      chartBar: 'c3-chart-bar',
      chartBars: 'c3-chart-bars',
      chartText: 'c3-chart-text',
      chartTexts: 'c3-chart-texts',
      chartArc: 'c3-chart-arc',
      chartArcs: 'c3-chart-arcs',
      chartArcsTitle: 'c3-chart-arcs-title',
      chartArcsBackground: 'c3-chart-arcs-background',
      chartArcsGaugeUnit: 'c3-chart-arcs-gauge-unit',
      chartArcsGaugeMax: 'c3-chart-arcs-gauge-max',
      chartArcsGaugeMin: 'c3-chart-arcs-gauge-min',
      selectedCircle: 'c3-selected-circle',
      selectedCircles: 'c3-selected-circles',
      eventRect: 'c3-event-rect',
      eventRects: 'c3-event-rects',
      eventRectsSingle: 'c3-event-rects-single',
      eventRectsMultiple: 'c3-event-rects-multiple',
      zoomRect: 'c3-zoom-rect',
      brush: 'c3-brush',
      focused: 'c3-focused',
      defocused: 'c3-defocused',
      region: 'c3-region',
      regions: 'c3-regions',
      tooltipContainer: 'c3-tooltip-container',
      tooltip: 'c3-tooltip',
      tooltipName: 'c3-tooltip-name',
      shape: 'c3-shape',
      shapes: 'c3-shapes',
      line: 'c3-line',
      lines: 'c3-lines',
      bar: 'c3-bar',
      bars: 'c3-bars',
      circle: 'c3-circle',
      circles: 'c3-circles',
      arc: 'c3-arc',
      arcs: 'c3-arcs',
      area: 'c3-area',
      areas: 'c3-areas',
      empty: 'c3-empty',
      text: 'c3-text',
      texts: 'c3-texts',
      gaugeValue: 'c3-gauge-value',
      grid: 'c3-grid',
      gridLines: 'c3-grid-lines',
      xgrid: 'c3-xgrid',
      xgrids: 'c3-xgrids',
      xgridLine: 'c3-xgrid-line',
      xgridLines: 'c3-xgrid-lines',
      xgridFocus: 'c3-xgrid-focus',
      ygrid: 'c3-ygrid',
      ygrids: 'c3-ygrids',
      ygridLine: 'c3-ygrid-line',
      ygridLines: 'c3-ygrid-lines',
      axis: 'c3-axis',
      axisX: 'c3-axis-x',
      axisXLabel: 'c3-axis-x-label',
      axisY: 'c3-axis-y',
      axisYLabel: 'c3-axis-y-label',
      axisY2: 'c3-axis-y2',
      axisY2Label: 'c3-axis-y2-label',
      legendBackground: 'c3-legend-background',
      legendItem: 'c3-legend-item',
      legendItemEvent: 'c3-legend-item-event',
      legendItemTile: 'c3-legend-item-tile',
      legendItemHidden: 'c3-legend-item-hidden',
      legendItemFocused: 'c3-legend-item-focused',
      dragarea: 'c3-dragarea',
      EXPANDED: '_expanded_',
      SELECTED: '_selected_',
      INCLUDED: '_included_'
  };
  c3_chart_internal_fn.generateClass = function (prefix, targetId) {
      return " " + prefix + " " + prefix + this.getTargetSelectorSuffix(targetId);
  };
  c3_chart_internal_fn.classText = function (d) {
      return this.generateClass(CLASS.text, d.index);
  };
  c3_chart_internal_fn.classTexts = function (d) {
      return this.generateClass(CLASS.texts, d.id);
  };
  c3_chart_internal_fn.classShape = function (d) {
      return this.generateClass(CLASS.shape, d.index);
  };
  c3_chart_internal_fn.classShapes = function (d) {
      return this.generateClass(CLASS.shapes, d.id);
  };
  c3_chart_internal_fn.classLine = function (d) {
      return this.classShape(d) + this.generateClass(CLASS.line, d.id);
  };
  c3_chart_internal_fn.classLines = function (d) {
      return this.classShapes(d) + this.generateClass(CLASS.lines, d.id);
  };
  c3_chart_internal_fn.classCircle = function (d) {
      return this.classShape(d) + this.generateClass(CLASS.circle, d.index);
  };
  c3_chart_internal_fn.classCircles = function (d) {
      return this.classShapes(d) + this.generateClass(CLASS.circles, d.id);
  };
  c3_chart_internal_fn.classBar = function (d) {
      return this.classShape(d) + this.generateClass(CLASS.bar, d.index);
  };
  c3_chart_internal_fn.classBars = function (d) {
      return this.classShapes(d) + this.generateClass(CLASS.bars, d.id);
  };
  c3_chart_internal_fn.classArc = function (d) {
      return this.classShape(d.data) + this.generateClass(CLASS.arc, d.data.id);
  };
  c3_chart_internal_fn.classArcs = function (d) {
      return this.classShapes(d.data) + this.generateClass(CLASS.arcs, d.data.id);
  };
  c3_chart_internal_fn.classArea = function (d) {
      return this.classShape(d) + this.generateClass(CLASS.area, d.id);
  };
  c3_chart_internal_fn.classAreas = function (d) {
      return this.classShapes(d) + this.generateClass(CLASS.areas, d.id);
  };
  c3_chart_internal_fn.classRegion = function (d, i) {
      return this.generateClass(CLASS.region, i) + ' ' + ('class' in d ? d['class'] : '');
  };
  c3_chart_internal_fn.classEvent = function (d) {
      return this.generateClass(CLASS.eventRect, d.index);
  };
  c3_chart_internal_fn.classTarget = function (id) {
      var $$ = this;
      var additionalClassSuffix = $$.config.data_classes[id], additionalClass = '';
      if (additionalClassSuffix) {
          additionalClass = ' ' + CLASS.target + '-' + additionalClassSuffix;
      }
      return $$.generateClass(CLASS.target, id) + additionalClass;
  };
  c3_chart_internal_fn.classFocus = function (d) {
      return this.classFocused(d) + this.classDefocused(d);
  };
  c3_chart_internal_fn.classFocused = function (d) {
      return ' ' + (this.focusedTargetIds.indexOf(d.id) >= 0 ? CLASS.focused : '');
  };
  c3_chart_internal_fn.classDefocused = function (d) {
      return ' ' + (this.defocusedTargetIds.indexOf(d.id) >= 0 ? CLASS.defocused : '');
  };
  c3_chart_internal_fn.classChartText = function (d) {
      return CLASS.chartText + this.classTarget(d.id);
  };
  c3_chart_internal_fn.classChartLine = function (d) {
      return CLASS.chartLine + this.classTarget(d.id);
  };
  c3_chart_internal_fn.classChartBar = function (d) {
      return CLASS.chartBar + this.classTarget(d.id);
  };
  c3_chart_internal_fn.classChartArc = function (d) {
      return CLASS.chartArc + this.classTarget(d.data.id);
  };
  c3_chart_internal_fn.getTargetSelectorSuffix = function (targetId) {
      return targetId || targetId === 0 ? ('-' + targetId).replace(/[\s?!@#$%^&*()_=+,.<>'":;\[\]\/|~`{}\\]/g, '-') : '';
  };
  c3_chart_internal_fn.selectorTarget = function (id, prefix) {
      return (prefix || '') + '.' + CLASS.target + this.getTargetSelectorSuffix(id);
  };
  c3_chart_internal_fn.selectorTargets = function (ids, prefix) {
      var $$ = this;
      ids = ids || [];
      return ids.length ? ids.map(function (id) { return $$.selectorTarget(id, prefix); }) : null;
  };
  c3_chart_internal_fn.selectorLegend = function (id) {
      return '.' + CLASS.legendItem + this.getTargetSelectorSuffix(id);
  };
  c3_chart_internal_fn.selectorLegends = function (ids) {
      var $$ = this;
      return ids && ids.length ? ids.map(function (id) { return $$.selectorLegend(id); }) : null;
  };
  