score:1

Accepted answer

you need to enable usehtml property for a tooltip.

  tooltip: {
    usehtml: true,
    ...
  }

css:

.highcharts-tooltip {
    line-height: 40px;
}

live demo: http://jsfiddle.net/blacklabel/893k5cnl/

api reference: https://api.highcharts.com/highcharts/tooltip.usehtml


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