Released: Jan 12, 2026

Updates in v12.5.0

Features

• New in Highcharts Core v12.5.0:
  • Added support for dendrograms by allowing treegraph charts to be plotted against an x-axis.
  • Added new option, legend.maxWidth.
  • Added the color-scheme CSS property across CSS files and Adaptive theme, to allow setting any color with the light-dark() CSS function.
  • Added a warning when chart.styledMode is enabled and the required CSS file is not loaded.

Fixes

• Fixes in Highcharts Core v12.5.0:
  • Fixed the last four of the default pattern fill definitions which had undefined color.
  • Fixed SeriesRegistry which was unavailable in custom ESM bundle because of circular import.
  • Fixed tooltip header which was rendered incorrectly for Chinese and other non-latin scripts.
  • Fixed tooltips with stickOnContact which now remain visible when the cursor leaves a point and re-enters the tooltip container within hideDelay.
  • Fixed points in boosted chart with zones that had the wrong color when not within a zone.
  • Fixed pie data labels which were misplaced after a chart size change.
  • Fixed a regression in templating which was causing bad formatting of decimal timestamps.
  • Fixed boosted series color which was wrong after updating to empty zones.
  • Fixed tooltip which was not rendering for heatmap cell on hover after dataClass legend toggle.
  • Fixed axis names which weren't translated in screen reader output.
  • Fixed gauge clip box which was incorrect when the pane position was close to the edge of the chart.
  • Fixed dataLabels.zIndex which was ignored, so labels could render above series regardless of the setting.
  • The Adaptive theme didn't work in Shadow DOM.
  • Disabled markers were appearing after zooming out when the accessibility module was loaded and the chart was in styled mode.
  • The chart.alignThreshold option did not always take effect after zooming.
  • Updating series with multiple data labels failed.
• Fixes in Highcharts Gantt v12.5.0:
  • Fixed incomplete tooltip in x-range and Gantt series when the x2 or end date was given as a string.
  • No drag handle was showing for a partially out of range points.