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  • Ivan Petrov thinks this is interesting:

tooltip : { useHTML: true, headerFormat: '<table><thead><tr>' + '<th style="border-bottom: 2px solid #6678b1; color: #039" ' + 'colspan=2 >{point.key}</th></tr></thead><tbody>', pointFormat: '<tr><td style="color: {series.color}">' + '<img src="./series_{series.index}.png" ' + 'style="vertical-align:text-bottom; margin-right: 5px" >' + '{series.name}: </td><td style="text-align: right; color: #669;">' + '<b>{point.y}</b></td></tr>', footerFormat: '</tbody></table>' },

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