Added breadcrumbs functionality for drilldown charts as well as hierarchical series like treemaps and sunburst. This replaces the drill-up and traverse-up buttons.
Added new feature chart.alignThresholds for aligning the thresholds in charts with multiple axes.
Added new option Highcharts.AST.bypassHTMLFiltering for disabling AST filtering.
Added option, boost.pixelRatio, providing Retina and device pixel ratio support to the Boost module.
Added areaspline series to the supported series in the Boost module, see #8288.
UPGRADE NOTESEXPANDCOLLAPSE
In an organization chart, children of a parent with hanging layout will now inherit this layout. To prevent this, set layout = "normal" for these nodes.
The offline exporting module now requires version 2 of jsPDF and version 2 of svg2pdf when exporting to PDF. Our own CDN, downloads and packages are updated, but if you’re loading old releases from elsewhere, it will fail.
34 BUGFIXESEXPANDCOLLAPSE
Fixed #15133, data labels were missing the fade-in effect upon drilling down.
Fixed #16470, setting custom drag handle cursor in options.
Fixed #16873, Windows High Contrast Mode not detected in non-Microsoft browsers.
Migrated global win to window. This will mask the global window object in every Highcharts bundle, so that always Highcharts.win === window.
Fixed #16788, accessibility issue with some columns not being focusable because of wrong point.isInside flag.
Fixed #16431, data points were trimmed due to axis floating-point rounding.
Fixed #6884, console errors related to style attributes because of Content Security Policy.
Fixed #16979, only one point per x value was shown when stacking set to percent.
Fixed #16974, esc keypress keyboard focus issue with multiple charts on the same page.