score:1

Accepted answer

You need to define the tickWidth property and set tickmarkPlacement to on:

  xAxis: {
    categories: [...],
    tickWidth: 1,
    tickmarkPlacement: 'on'
  }

Live demo: http://jsfiddle.net/BlackLabel/580upzk7/

API Reference: https://api.highcharts.com/highcharts/xAxis


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