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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