Common tick options to all axes

Namespace: options.scales[scaleId].ticks

Name	Type	Scriptable	Default	Description
backdropColor	Color	Yes	'rgba(255, 255, 255, 0.75)'	Color of label backdrops.
backdropPadding	Padding		2	Padding of label backdrop.
callback	function			Returns the string representation of the tick value as it should be displayed on the chart. See callback.
display	boolean		true	If true, show tick labels.
color	Color	Yes	Chart.defaults.color	Color of ticks.
font	Font	Yes	Chart.defaults.font	See Fonts
major	object		{}	Major ticks configuration.
padding	number		3	Sets the offset of the tick labels from the axis
showLabelBackdrop	boolean	Yes	true for radial scale, false otherwise	If true, draw a background behind the tick labels.
textStrokeColor	Color	Yes	``	The color of the stroke around the text.
textStrokeWidth	number	Yes	0	Stroke width around the text.
z	number		0	z-index of tick layer. Useful when ticks are drawn on chart area. Values <= 0 are drawn under datasets, > 0 on top.