Welcome to the Highcharts Stock JS (highstock) Options Reference

These pages outline the chart configuration options, and the methods and properties of Highcharts objects.

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navigator.yAxis.gridLineWidth

The width of the grid lines extending the ticks across the plot area. Defaults to 1 on the Y axis and 0 on the X axis, except for 3d charts.

In styled mode, the stroke width is given in the .highcharts-grid-line class.