# JS API Reference

# Welcome to the Highcharts JS Options Reference

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

Feel free to search this API through the search bar or the navigation tree in the sidebar.

# 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.