Welcome to the Highcharts JS (highcharts) Options Reference

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

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chart.parallelAxes.top

The top position of the Y axis. If it's a number, it is interpreted as pixel position relative to the chart.

Since Highcharts 2: If it's a percentage string, it is interpreted as percentages of the plot height, offset from plot area top.