custom function for returning tooltip HTML passed an array or object with the data, and then the default tooltip markup
options to configure the datapoint tooltip
toggles on/off datapoint tooltips.
offset of the tooltip from the mouse position
vertical offset for tooltip placement
a function to format the tooltip values
options for gridline event listeners
controls whether the gridlines are active for tooltip support
optional set threshold (value between 0 and 1) for active gridlines
vertical offset for title tooltip placement. < 0 will shift the tooltip above title, > 0 shifts vertically down
max width of title tooltip relative to the width of the chart-svg (percentage should be < 1)
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extends tooltip options to provide support for multiple gridline tooltips