score:2

Accepted answer

you can use scatter serie with linewidth set as 2, then hide a svg path (line) and catch mouseover / mouseout events to manipulate graphic.

example:

http://jsfiddle.net/sbochan/t96cds7o/3/

plotoptions: {
            series: {
                point: {
                    events: {
                        mouseover: function () {
                            this.series.graph.show();
                        }
                    }
                },
                events: {
                    mouseout: function () {
                        this.graph.hide();
                    }
                }
            }
        },

 // callback
 settimeout(function(){
        chart.series[0].graph.hide();
 },1);

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