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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