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Gets the font used by the watermark label.
Use the returned font object to configure the watermark label font for the range, such as its bold style, italic style, size, and color. SpreadJS only.
IFont Font { get; }
ReadOnly Property Font As IFont
IRange range = worksheet.Range["A1"];
range.Watermark = "Required";
IFont font = range.LabelOptions.Font;
font.Bold = true;
font.Color = Color.Blue;