- New `waterfall` trace type [#3531, #3708]

- New `sunburst` trace type [#3594]

- Add attributes `node.x` and `node.y` to `sankey` traces [#3583]

- Implement `connectgaps` on `surface` traces [#3638]

- Implement `hovertemplate` for `box` and `violin` points [#3685]

- Display hover labels above modebar, ensuring that the hover labels

are always visible within the graph div [#3589, #3678]

- Fix horizontal legend item wrapping by pushing overflowed items to newline [#3628]

- Fix erroneous gap for histogram under relative `barmode` [#3652]

- Fix position of overlapping grouped bars within trace [#3680]

- Fix `violin` `bandwidth` logic for traces with identical values in sample [#3626]

- Fix `violin` trace `scalegroup` description [#3687]

- Fix stacked scatter for groupby traces [#3692]

- Fix outside text on empty items in `bar` traces under `textposition: 'outside'` [#3701]

- Fix `pie` un-hover event emission after updates [#3662, 3690]

- Fix `scatter` line decimation algo for filled trace with far-away data points [#3696]

- Fix `heatmap` and `contour` computation for traces with category coordinates containing `0` [#3691]

- Fix zoom interactions on gl3d subplots using an orthographic projection [#3601]

- Fix miscellaneous gl3d camera on-initialization bugs [#3585]

- Fix `surface` contour line rendering in some Firefox versions [#3670]

- Fix rendering of marker points and gl3d subplots on date axes (or with coordinates close to 64K floating limits)

for WebGL-based traces on some iOS devices [#3666, #3672, #3674, #3676]

- Fix center-aligned hover labels positioning [#3681]