History is one of the common approaches to creating a drilldown chart. It works just like the back and forward buttons of an Internet browser. When a series URL attribute directs to another chart's JSON file, clicking on the plotted data will render the linked JSON packet. Including the chart history object allows the user to go back and forth between the loaded charts. Note that the 'history' object must be placed in the root, outside of 'graphset'.

Attribute	Type	Description
alpha	Number	Sets the opacity on the marker, with 0 being fully transparent and 1 being fully opaque. Note that decimal value requires the leading 0. Default Value: 1
anchor	String	Allows you to set an object's anchor position Accepted Values: ['tl', 'tr', 'bl', 'br', 'c', 't', 'r', 'b', 'l'] Default Value: 'tl'
backgroundColor background-color	String	Sets the background color of the object. Colors can be entered by name (e.g., "purple", "blue"), hexadecimal notation (e.g., "#666699", #33ccff"), or RGB notation (e.g., "rgb(255,0,0)", "rgb(0,0,255)") Default Value: null
backgroundColor1 background-color-1	String	Sets the first color of a 2 color background gradient of the object. To be used with background-color-2. Default Value: null
backgroundColor2 background-color-2	String	Sets the second color of a 2 color background gradient of the object. To be used with background-color-1. Default Value: null
border	Number	Sets the border width of the object. Can be a single value or a string of values, setting the values in the order "top right bottom left"
borderAlpha border-alpha	Number	Sets the transparency level of the border on the object. Values must range between 0.0 and 1.0, with 0.0 being completely transparent and 1.0 being completely opaque. Note that values require the leading 0 before the decimal point. Default Value: 1 Introduced in: v2.1.1
borderBottom border-bottom	Number	Sets the object's bottom border style. Accepts solid, dashed, and dotted styles. Default Value: ''
borderColor border-color	String	Sets the border color of the object. Default Value: '#000'
borderLeft border-left	Number	Sets the object's left border style. Accepts solid, dashed, and dotted styles.
borderRadius border-radius	Number	Sets the object's border radius for rounded corners. Larger values create rounder corners, while smaller values create sharper corners. A single value will affect all 4 corners; multiple values will have separate effects on each corner, with the first value affecting the top-left corner, the second value affecting the top-right corner, and so on, in a clockwise direction. A negative value will cut a corner off without rounding. Default Value: 0
borderRadiusBottomLeft border-radius-bottom-left	Number	Sets the object's bottom-left border radius for rounded corners. Larger values create rounder corners, while smaller values create sharper corners. A negative value will cut a corner off without rounding. Default Value: 0
borderRadiusBottomRight border-radius-bottom-right	Number	Sets the object's bottom-right border radius for rounded corners. Larger values create rounder corners, while smaller values create sharper corners. A negative value will cut a corner off without rounding. Default Value: 0
borderRadiusTopLeft border-radius-top-left	Number	Sets the object's top-left border radius for rounded corners. Larger values create rounder corners, while smaller values create sharper corners. A negative value will cut a corner off without rounding. Default Value: 0
borderRadiusTopRight border-radius-top-right	Number	Sets the object's top-right border radius for rounded corners. Larger values create rounder corners, while smaller values create sharper corners. A negative value will cut a corner off without rounding. Default Value: 0
borderRight border-right	Number	Sets the object's right border style. Accepts solid, dashed, and dotted styles. Default Value: ''
borderTop border-top	Number	Sets the object's top border style. Accepts solid, dashed, and dotted styles. Default Value: ''
borderWidth border-width	Number	Sets the border width of the object. Default Value: 0
callout	Boolean	Sets whether an object will have a callout arrow or not. Default Value: false
calloutExtension callout-extension	Number	Sets the length of the extension that extends beyond the tip of the callout arrow. Default Value: 0
calloutHeight callout-height	Number	Sets the height of the object's callout arrow. A larger value will create a taller callout arrow. Default Value: 8
calloutHook callout-hook	Array.<Number>	Sets the point of the tip of the callout arrow to a specified coordinate on the chart, with the starting point of [0,0] being the top left corner of the chart. Default Value: null
calloutOffset callout-offset	Number	Sets the offset along the callout direction of the arrow's base. Positive and negative values can be used to offset the callout arrow up, down, left, or right depending on the callout-position. Default Value: 0
calloutPosition callout-position	String	Sets the position for the object's callout arrow. The position is "bottom" by default. Default Value: 'bottom'
calloutRatio callout-ratio	Array.<Number>	Sets how much to stretch/squeeze the callout arrow on its two sides. A zero value for example on one side would create like a half callout arrow. Negative values can also be set, in order to create various aspects. Default Value: [1, 1]
calloutTip callout-tip	Object	To style the tip of the callout. You can modify the shape with a "type" attribute. Value options include "circle", "diamond", "cross", and "arrow". For styling, use attributes such as "background-color", "border-color", "border-width", "line-color", "line-width", and so on. Default Value: null
calloutWidth callout-width	Number	Sets the width of the object's callout arrow. A larger value will create a wider callout arrow. Default Value: 8
centerRef center-ref	Boolean	Sets the (0,0) x/y coordinates as the center of the box (instead of the top-left corner). Default Value: false
class	String	Sets a class value on the object. Default Value: null
dataN data-n	Any	Prefix attribute or array using "data-" to define a custom token.
fillAngle fill-angle	Number	Sets the angle of the axis along which the linear gradient is drawn. Default Value: 90
fillOffsetX fill-offset-x	Number	Sets an X offset to apply to the fill. Default Value: 0
fillOffsetY fill-offset-y	Number	Sets a Y offset to apply to the fill. Default Value: 0
fillType fill-type	String	Sets the background gradient fill type to either linear or radial. Accepted Values: ['linear', 'none', 'radial'] Default Value: 'linear'
gradientColors gradient-colors	String	Sets a set of colors for a complex background gradient consisting of 2 or more colors. To be used with gradient-stops. Default Value: ''
gradientStops gradient-stops	String	Sets the gradient stops for a complex background gradient consisting of 2 or more colors. To be used with gradient-colors. Default Value: ''
height	Number	Sets the object's height. Default Value: 0
id	String	Sets the id of the object. Default Value: ''
item	Object	Sets the id or style of the item.
itemOff item-off	Object	The 'item-off' object allows you to style the inactive arrows within the chart history panel.
margin	Number, String	Sets the object's margin/s from the top-left of the chart. Accepted Values: ['dynamic'] Default Value: 0
marginBottom margin-bottom	Number	Sets the object's bottom margin. Default Value: -1
marginLeft margin-left	Number	Sets the object's left margin. Default Value: -1
marginRight margin-right	Number	Sets the object's right margin. Default Value: -1
marginTop margin-top	Number	Sets the object's top margin. Default Value: -1
maxWidth max-width	Number	Sets a maximum width of the object.
padding	Number	Sets the object's padding around the text. Up to four values can be entered to set the padding for all four sides, with the first value affecting the top padding, the second value affecting the right padding, and so on, in a clockwise direction. Default Value: null
paddingBottom padding-bottom	Number	Sets the object's bottom padding around the text. Default Value: 2
paddingLeft padding-left	Number	Sets the object's left padding around the text. Default Value: 2
paddingRight padding-right	Number	Sets the object's right padding around the text. Default Value: 2
paddingTop padding-top	Number	Sets the object's top padding around the text. Default Value: 2
position	String	Sets the object's position relative to its container. Similar results can be obtained by setting [margin] and [margin-...] attributes. Uses x,y coordinates originating from the top left of the chart. Default Value: ''
rectShortcut rect-shortcut	Boolean	Used to force the library to create rectangles using a faster drawing API (instead of painting them like a closed polygon). However, using this would disable effects like rounded borders. It is a performance setting for edge cases. Default Value: false
width	Number	Sets the object's width. Default Value: 0
x	Number	Sets the X position of the object. Default Value: -1
y	Number	Sets the Y position of the object.
zIndex z-index	Number	Sets the z position of the object. Objects with higher z indexes will appear "above" those with lower z index values. Default Value: 1