javascript - Highcharts not displaying tooltip title properly -

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i'm using highcharts (technically highstock .js file though) display chart on site. works except tooltip. api specifies {series.name} should work specifying series name in tooltip, chart displays "{series.name}" instead of name itself. here's simplified jsfiddle illustrates issue. switch comments on headerformat: lines in tooltip section , you'll see {point.key} works expected, {series.name} not.

what's wrong code produce problem?

it known bug reported our developers here.

workaround: use tooltip formatter , print informations need.


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