Accepted answer

it is related with pointtracker, which is used by line chart, but you can use scatter series and setting linewidth:

 chart: {

        type: 'scatter'

    series: [{
        data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]        


using the highcharts options you can set the following to achieve the effect you want:

plotoptions: {
    series: {
        stickytracking: false
tooltip: {
    snap: 0

this will cause the tooltip to trigger only when the mouse is directly over the point and turn off when the mouse leaves the point. the only problem with this is that the fade out animation (i.e. snap: 0) takes some time, but you should be able to change the animation time. i haven't found it yet though.

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