diff --git a/components/fpspreadsheet/examples/other/chart/write_chart_demo.lpr b/components/fpspreadsheet/examples/other/chart/write_chart_demo.lpr
index bd9b0064a..bb6494a4e 100644
--- a/components/fpspreadsheet/examples/other/chart/write_chart_demo.lpr
+++ b/components/fpspreadsheet/examples/other/chart/write_chart_demo.lpr
@@ -5,7 +5,7 @@ program write_chart_demo;
 uses
   SysUtils, fpspreadsheet, fpstypes, fpschart, xlsxooxml, fpsopendocument;
 const
-  SERIES_CLASS: TsChartSeriesClass = TsBarSeries;
+  SERIES_CLASS: TsChartSeriesClass = TsAreaSeries;
 var
   b: TsWorkbook;
   sh1, sh2, sh3: TsWorksheet;
@@ -63,20 +63,21 @@ begin
     ch.Background.Style := fsSolidFill;
     ch.Border.Style := clsSolid;
     ch.PlotArea.Background.Style := fsSolidFill;
-    ch.RotatedAxes := true;
+    //ch.RotatedAxes := true;
+    ch.StackMode := csmStackedPercentage;
 
     ch.XAxis.ShowLabels := true;
-    ch.XAxis.LabelFont.Size := 8;
+    ch.XAxis.LabelFont.Size := 9;
     ch.XAxis.LabelFont.Color := scRed;
-    ch.XAxis.LabelFont.Style := [fssStrikeout];
+    //ch.XAxis.LabelFont.Style := [fssStrikeout];
     ch.XAxis.AxisLine.Color := scRed;
     ch.XAxis.Caption := 'This is the x axis';
     ch.XAxis.CaptionFont.Color := scRed;
     ch.XAxis.CaptionFont.Size := 12;
-    ch.XAxis.Inverted := true;
+    //ch.XAxis.Inverted := true;
     ch.XAxis.MajorGridLines.Color := scRed;
     ch.XAxis.MinorGridLines.Color := scBlue;
-    ch.XAxis.MajorGridLines.Style := clsNoLine;//Solid;
+    ch.XAxis.MajorGridLines.Style := clsNoLine; //Solid;
     ch.XAxis.MinorGridLines.Style := clsNoLine; //Solid;
 
     ch.YAxis.ShowLabels := true;
@@ -86,8 +87,8 @@ begin
     ch.YAxis.Caption := 'This is the y axis';
     ch.YAxis.CaptionFont.Color := scBlue;
     ch.YAxis.CaptionFont.Size := 12;
-    ch.YAxis.LabelRotation := 90;
-    ch.YAxis.CaptionRotation := 90;
+    //ch.YAxis.LabelRotation := 90;
+    //ch.YAxis.CaptionRotation := 90;
     ch.YAxis.MajorGridLines.Color := scBlue;
     ch.YAxis.MajorGridLines.Style := clsLongDash; //clsSolid;
     ch.YAxis.MajorGridLines.Width := 0.5;  // mm
diff --git a/components/fpspreadsheet/source/common/fpschart.pas b/components/fpspreadsheet/source/common/fpschart.pas
index 8082a4039..38ea80129 100644
--- a/components/fpspreadsheet/source/common/fpschart.pas
+++ b/components/fpspreadsheet/source/common/fpschart.pas
@@ -230,6 +230,11 @@ type
   end;
   TsChartSeriesClass = class of TsChartSeries;
 
+  TsAreaSeries = class(TsChartSeries)
+  public
+    constructor Create(AChart: TsChart); override;
+  end;
+
   TsBarSeries = class(TsChartSeries)
   public
     constructor Create(AChart: TsChart); override;
@@ -268,6 +273,8 @@ type
     property Items[AIndex: Integer]: TsChartSeries read GetItem write SetItem; default;
   end;
 
+  TsChartStackMode =(csmSideBySide, csmStacked, csmStackedPercentage);
+
   TsChart = class(TsChartFillElement)
   private
     FIndex: Integer;             // Index in workbook's chart list
@@ -284,6 +291,7 @@ type
     FY2Axis: TsChartAxis;
 
     FRotatedAxes: Boolean;   // For bar series: vertical columns <--> horizontal bars
+    FStackMode: TsChartStackMode;
 
     FTitle: TsChartText;
     FSubTitle: TsChartText;
@@ -350,8 +358,11 @@ type
     property YAxis: TsChartAxis read FYAxis write FYAxis;
     { Attributes of the plot's secondary y axis (right) }
     property Y2Axis: TsChartAxis read FY2Axis write FY2Axis;
+
     { x and y axes exchanged (for bar series) }
     property RotatedAxes: Boolean read FRotatedAxes write FRotatedAxes;
+    { stacked series }
+    property StackMode: TsChartStackMode read FStackMode write FStackMode;
 
     property CategoryLabelRange: TsCellRange read GetCategoryLabelRange;
 
@@ -685,6 +696,15 @@ begin
 end;
 
 
+{ TsAreaSeries }
+
+constructor TsAreaSeries.Create(AChart: TsChart);
+begin
+  inherited Create(AChart);
+  FChartType := ctArea;
+end;
+
+
 { TsBarSeries }
 
 constructor TsBarSeries.Create(AChart: TsChart);
diff --git a/components/fpspreadsheet/source/common/fpsopendocument.pas b/components/fpspreadsheet/source/common/fpsopendocument.pas
index 8d6239ca1..a6023002a 100644
--- a/components/fpspreadsheet/source/common/fpsopendocument.pas
+++ b/components/fpspreadsheet/source/common/fpsopendocument.pas
@@ -311,7 +311,7 @@ type
       AChartIndent, AStyleIndent: Integer; AChart: TsChart; var AStyleID: Integer);
     procedure WriteChartLegend(AChartStream, AStyleStream: TStream;
       AChartIndent, AStyleIndent: Integer; AChart: TsChart; var AStyleID: Integer);
-    procedure WriteChartNumberStyles(AStream: TStream; AIndent: Integer);
+    procedure WriteChartNumberStyles(AStream: TStream; AIndent: Integer; AChart: TsChart);
     procedure WriteChartPlotArea(AChartStream, AStyleStream: TStream;
       AChartIndent, AStyleIndent: Integer; AChart: TsChart; var AStyleID: Integer);
     procedure WriteChartSeries(AChartStream, AStyleStream: TStream;
@@ -6771,7 +6771,7 @@ begin
   chartStream := TMemoryStream.Create;
   styleStream := TMemoryStream.Create;
   try
-    WriteChartNumberStyles(styleStream, 4);
+    WriteChartNumberStyles(styleStream, 4, AChart);
 
     styleID := 1;
     WriteChartBackground(chartStream, styleStream, 6, 4, AChart, styleID);
@@ -7043,7 +7043,7 @@ begin
 end;
 
 procedure TsSpreadOpenDocWriter.WriteChartNumberStyles(AStream: TStream;
-  AIndent: Integer);
+  AIndent: Integer; AChart: TsChart);
 var
   indent: String;
 begin
@@ -7055,7 +7055,13 @@ begin
     indent + '</number:number-style>' + LE
   );
 
-  // Other styles follow here, for example for "percentage" stacked bars.
+  if AChart.StackMode = csmStackedPercentage then
+    AppendToStream(AStream,
+      indent + '<number:percentage-style style:name="N10010">' + LE +
+      indent + '  <number:number number:decimal-places="0" number:min-decimal-places="0" number:min-integer-digits="1"/>' + LE +
+      indent + '  <number:text>%</number:text>' + LE +
+      indent + '</number:percentage-style>' + LE
+    );
 end;
 
 procedure TsSpreadOpenDocWriter.WriteChartPlotArea(AChartStream, AStyleStream: TStream;
@@ -7191,6 +7197,7 @@ var
   textProps: String = '';
   graphProps: String = '';
   chartProps: String = '';
+  numStyle: String = 'N0';
 begin
   Result := '';
   if not Axis.Visible then
@@ -7198,6 +7205,9 @@ begin
 
   chart := Axis.Chart;
 
+  if (Axis = chart.YAxis) and (chart.StackMode = csmStackedPercentage) then
+    numStyle := 'N10010';
+
   if Axis.ShowLabels then
     chartProps := chartProps + 'chart:display-label="true" ';
 
@@ -7208,12 +7218,6 @@ begin
     chartProps := chartProps + 'chart:reverse-direction="true" ';
 
   angle := Axis.LabelRotation;
-  {
-  if chart.RotatedAxes then
-  begin
-    if angle = 0 then angle := 90 else if angle = 90 then angle := 0;
-  end;
-  }
   chartProps := chartProps + Format('style:rotation-angle="%d" ', [angle]);
 
   graphProps := 'svg:stroke-color="' + ColorToHTMLColorStr(Axis.AxisLine.Color) + '" ';
@@ -7222,12 +7226,12 @@ begin
 
   indent := DupeString(' ', AIndent);
   Result := Format(
-    indent + '<style:style style:name="ch%d" style:family="chart" style:data-style-name="N0">' + LE +
+    indent + '<style:style style:name="ch%d" style:family="chart" style:data-style-name="%s">' + LE +
     indent + '  <style:chart-properties %s/>' +  LE +
     indent + '  <style:graphic-properties %s/>' + LE +
     indent + '  <style:text-properties %s/>' + LE +
     indent + '</style:style>' + LE,
-    [ AStyleID, chartProps, graphProps, textProps ]
+    [ AStyleID, numStyle, chartProps, graphProps, textProps ]
   );
 end;
 
@@ -7429,16 +7433,23 @@ function TsSpreadOpenDocWriter.GetChartPlotAreaStyleAsXML(AChart: TsChart;
 var
   indent: String;
   verticalStr: String = '';
+  stackModeStr: String = '';
 begin
   indent := DupeString(' ', AIndent);
 
-  if (AChart.Series.Count > 0) and (AChart.Series[0] is TsBarSeries) and AChart.RotatedAxes then
+  if AChart.RotatedAxes then
     verticalStr := 'chart:vertical="true" ';
+  case AChart.StackMode of
+    csmSideBySide: ;
+    csmStacked: stackModeStr := 'chart:stacked="true" ';
+    csmStackedPercentage: stackModeStr := 'chart:percentage="true" ';
+  end;
 
   Result := Format(
     indent + '  <style:style style:name="ch%d" style:family="chart">' + LE +
     indent + '    <style:chart-properties ' +
                    verticalStr +
+                   stackModeStr +
                    'chart:symbol-type="automatic" ' +
                    'chart:include-hidden-cells="false" ' +
                    'chart:auto-position="true" ' +