These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Callback JavaScript function to format the label. The value
is given by this.value. Additional properties for this are
axis, chart, isFirst and isLast. The value of the default
label formatter can be retrieved by calling
this.axis.defaultLabelFormatter.call(this) within the function.
Defaults to:
function() {
return this.value;
}