score:0

Accepted answer

it seems that your code was almost good except this callback pointformatter callback - notice that this calls for point already, so this.point refers to undefined, it should be:

  tooltip: {
    pointformatter: function() {

      console.log(this);
      return "low: " + this.low + "  <br>high:" + this.high;
    }
  },

demo: https://jsfiddle.net/blacklabel/vbo6j9em/


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