Formatting the Chart Subtitle

"subtitle": {
   "text": "string",
   "visible": boolean,
   "align": "string", 
   "font": "string",
   "color": "string"

   } 

where:

"text": "string"

Is a string that defines the subtitle text. The default value is "Chart Subtitle".

"visible": boolean

Controls the visibility of the chart subtitle. Valid values are:

• true, which makes the chart subtitle visible.
• false, which makes the chart subtitle not visible. This is the default value.

"align": "string"

Is a string that defines the alignment of the subtitle, Valid values are:

• "center", which centers the subtitle in the draw area. This is the default value.
• "chartFrame", which centers the subtitle aligned with the chart frame.
• "left", which left-justifies the chart subtitle in the draw area.
• "right", which right-justifies the chart subtitle in the draw area.

"font": "string"

Is a string that defines the size, style, and, typeface of the chart subtitle. The default value is "10pt Sans-Serif".

"color": "string"

Is a string that defines the color of the chart subtitle using a color name or numeric specification string. The default value is "black".

For information about specifying colors, see Colors and Gradients.

"backgroundColor": "string"

Is a color specification string or gradient definition that defines the background fill color of the chart title object. The default value is undefined.

"border"

Defines the properties of the border around the chart title object.

"width": number

Defines the width of the border in pixels. The default value is 0 (zero).

"color": "string"

Is a color specification string that defines the color of the border around the chart title object. The default value is undefined.

"dash": "string"

Is a string that defines the dash style of the border around the chart title object. Enter the length of the dash in pixels followed by the length of the space between dashes in pixels. The default value is no dash (" ").

"cornerRadius": {"x": value, "y": value}

Defines the properties of the corners of the box around the title object.

The cornerRadius property can consist of one value or two values. When there is one value that is zero (0), the corners are square. This is the default corner shape. Rounded corners can be circular or elliptical. The x and y values denote the size of the circle radius or the semi-major and semi-minor axes of the ellipse.

Valid values for x and y are:

• A number that specifies the radius of the corner in pixels.
• A percent string such as "20%", that represents a percentage of the height (y) or width (x) of the box around the title object.
• A CSS length string such as "5em" or "10px" that specifies the radius of the corner in pixels. For information about CSS length strings, see https://developer.mozilla.org/en-US/docs/Web/CSS/length.
• An object with "x" and "y" properties (where "x" and "y" can be any of the above) to specify the corner radius along the width (x) and height (y) of the title object box.