These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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An array of lines stretching across the plot area, marking a specific value on one of the axes.
In styled mode, the plot lines are styled by the
.highcharts-plot-line class in addition to the className option.
When doing Chart.update() or Axis.update(), the plot lines are updated
by index or id. The following merging rules apply:
plotLines are not defined in the new options, all existing plot lines
are kept.plotLines are defined without ids, the existing plot lines are updated
by index. If the new array has fewer plot lines, the remaining existing
plot lines are removed. If the new array has more plot lines, the extra
ones are added. An empty array removes all existing plot lines.plotLines are defined with ids, the existing plot lines are matched
by id, and remaining unmatched existing plot lines are removed.