explore tooltip formatters and customize them as needed
tooltip: {
useHTML: true,
formatter: function() {
return '<small>' +
Highcharts.dateFormat('%A,%b %d,%Y',
new Date(this.x)) + '</small><br> '+
"<span style='color:" + this.points[0].series.color +
"'>\u25CF</span> " + this.points[0].series.name + ': <b> ' + this.y + '</b>';
}
},
To easily customize the tooltip, adjust the split property to false and update the series name to 'MSFT'.
Check out the API Reference for more details:
https://api.highcharts.com/highcharts/tooltip.split
For a live example, see this demo:
http://jsfiddle.net/896xsskw/
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