Added

• Add property zerolinelayer to cartesian axes to allow drawing zeroline above traces [#7269]
• Add pattern.path attribute as an alternative to the preset pattern.shape values, so you can use any SVG path string as a pattern fill. [#7280]
• Allow configuration of horizontal legend max height [#7359]
• Add support for ticklabelposition "inside"/"outside" for category axes with tickson set to "boundaries" [#7420],
  with thanks to @my-tien for the contribution!

Changed

• Switch to United Nations (coastlines, countries, land, ocean) + Natural Earth (lakes, rivers, subunits) geodata for building topojson used in geo plot [#7393]
• Make 'png' all caps [#7400]

Fixed

• Fix installing dependencies in node v22 [#7381], with thanks to @chaigh-uk for the contribution!
• Fix performance warning in scattergl traces, [#7390], with thanks to @MzyzzG for the contribution!
• Move css-loader and other dependencies into devDependencies section [#7407]
• Fix Persian calendar leap year [#7456]

Changed

• Update color-rgba from 2.1.1 to 3.0.0 to fix hsl color conversion bug [#7325]

Fixed

• Fix click event handling for plots in shadow DOM elements [#7357]
• Fix hoverlabels and other text labels with null values templated in [#7360]
• Fix importing plotly.js via require on pages with AMD [#7367]
• Update Romanian locale [#7351]
• Update Italian locale [#4425]
• Update Turkish locale [#7352]

Removed

• Drop support for passing a string to the title attribute, and drop support for deprecated attributes titlefont, titleposition, titleside, and titleoffset (use title.text, title.font, title.side, title.offset instead)[#7212]
• Drop deprecated pointcloud and heatmapgl traces and gl2d subplots [#7213]
  Drop support for deprecated bardir attribute (use orientation instead) [#7214]
• Drop support for deprecated annotation.ref attribute (use annotation.xref and annotation.yref instead) [#7215]
• Drop support for deprecated error bar opacity attribute (use alpha channel of error bar color attribute instead) [#7214]
• Drop support for deprecated attribute gl3d.cameraposition (use gl3d.camera instead) [#7217]
• Drop deprecated plot3dPixelRatio from config [#7231]
• Drop deprecated zauto, zmin and zmax from the surface trace [#7234]
• Drop deprecated autotick attributes from cartesian axes [#7236]
• Drop transforms from the API [#7240, #7254]
• Drop jQuery events support [#7224]
• Drop the AMD support from the bundle header [#7229]

Changed

• Switch from webpack to esbuild for fast builds & testing as well as allowing modern JavaScript beyond es5 [#6909]
• Make offsetgroup work with barmode "stacked" and "relative" for bar traces [#7009]
• Node v18 required for development [#7116]
• Cleanup remaining code that was there to support the Internet Explorer [#7251]
• Deprecate mapbox traces and provide links to migration docs for plotly.js and plotly.py users [#7260]

Fixed

• Remove inline styles that break plots in strict CSP setups [#7109],
  with thanks to @martian111 for the contribution!
• Allow null or broken selection objects without throwing an error [#7164]
• Render scatterternary traces correctly if they have the ids attribute [#7164]
• Do not convert url-sourced layout images to data URI unless we're in staticPlot mode, to improve interactivity when images are changed with zoom/pan [#7199]
• Fix source map of the mablibre dependency [#7204]
• Fix years in license [#7205]
• Maintain layout images element identity based on coordinates,
  for smoother updates when you add or remove images early in the list. [#7277]
• Fix handling of new domain values given in the Plotly.react function to
  prevent loss of new domain values. [#7283]
• Fix distortions in sankey diagram links loops [#7272],
  with thanks to @giuseppe-straziota for the contribution!
• Performance improvement for scattergl traces with many points [#7301],
  with thanks to @giuseppe-straziota for the contribution!
• Set height and width on the .plotly-container div to 100% to fix gl3d rendering in Dash Enterprise apps [#7313]

Removed

• Drop support for passing a string to the title attribute, and drop support for deprecated attributes titlefont, titleposition, titleside, and titleoffset (use title.text, title.font, title.side, title.offset instead)[#7212]
• Drop deprecated pointcloud and heatmapgl traces and gl2d subplots [#7213]
  Drop support for deprecated bardir attribute (use orientation instead) [#7214]
• Drop support for deprecated annotation.ref attribute (use annotation.xref and annotation.yref instead) [#7215]
• Drop support for deprecated error bar opacity attribute (use alpha channel of error bar color attribute instead) [#7214]
• Drop support for deprecated attribute gl3d.cameraposition (use gl3d.camera instead) [#7217]
• Drop deprecated plot3dPixelRatio from config [#7231]
• Drop deprecated zauto, zmin and zmax from the surface trace [#7234]
• Drop deprecated autotick attributes from cartesian axes [#7236]
• Drop transforms from the API [#7240, #7254]
• Drop jQuery events support [#7224]
• Drop the AMD support from the bundle header [#7229]

Changed

• Switch from webpack to esbuild for fast builds & testing as well as allowing modern JavaScript beyond es5 [#6909]
• Make offsetgroup work with barmode "stacked" and "relative" for bar traces [#7009]
• Node v18 required for development [#7116]
• Cleanup remaining code that was there to support the Internet Explorer [#7251]
• Deprecate mapbox traces and provide links to migration docs for plotly.js and plotly.py users [#7260]

Fixed

• Remove inline styles that break plots in strict CSP setups [#7109],
  with thanks to @martian111 for the contribution!
• Allow null or broken selection objects without throwing an error [#7164]
• Render scatterternary traces correctly if they have the ids attribute [#7164]
• Do not convert url-sourced layout images to data URI unless we're in staticPlot mode, to improve interactivity when images are changed with zoom/pan [#7199]
• Fix source map of the mablibre dependency [#7204]
• Fix years in license [#7205]
• Maintain layout images element identity based on coordinates,
  for smoother updates when you add or remove images early in the list. [#7277]
• Fix handling of new domain values given in the Plotly.react function to
  prevent loss of new domain values. [#7283]
• Fix distortions in sankey diagram links loops [#7272],
  with thanks to @giuseppe-straziota for the contribution!
• Performance improvement for scattergl traces with many points [#7301],
  with thanks to @giuseppe-straziota for the contribution!
• Set height and width on the .plotly-container div to 100% to fix gl3d rendering in Dash Enterprise apps [#7313]

Fixed

• Set height and width on the .plotly-container div to 100% [#7314]

Removed

• Drop support for passing a string to the title attribute, and drop support for deprecated attributes titlefont, titleposition, titleside, and titleoffset (use title.text, title.font, title.side, title.offset instead)[#7212]
• Drop deprecated pointcloud and heatmapgl traces and gl2d subplots [#7213]
  Drop support for deprecated bardir attribute (use orientation instead) [#7214]
• Drop support for deprecated annotation.ref attribute (use annotation.xref and annotation.yref instead) [#7215]
• Drop support for deprecated error bar opacity attribute (use alpha channel of error bar color attribute instead) [#7214]
• Drop support for deprecated attribute gl3d.cameraposition (use gl3d.camera instead) [#7217]
• Drop deprecated plot3dPixelRatio from config [#7231]
• Drop deprecated zauto, zmin and zmax from the surface trace [#7234]
• Drop deprecated autotick attributes from cartesian axes [#7236]
• Drop transforms from the API [#7240, #7254]
• Drop jQuery events support [#7224]
• Drop the AMD support from the bundle header [#7229]

Changed

• Switch from webpack to esbuild for fast builds & testing as well as allowing modern JavaScript beyond es5 [#6909]
• Make offsetgroup work with barmode "stacked" and "relative" for bar traces [#7009]
• Node v18 required for development [#7116]
• Cleanup remaining code that was there to support the Internet Explorer [#7251]
• Deprecate mapbox traces and provide links to migration docs for plotly.js and plotly.py users [#7260]

Fixed

• Remove inline styles that break plots in strict CSP setups [#7109],
  with thanks to @martian111 for the contribution!
• Allow null or broken selection objects without throwing an error [#7164]
• Render scatterternary traces correctly if they have the ids attribute [#7164]
• Do not convert url-sourced layout images to data URI unless we're in staticPlot mode, to improve interactivity when images are changed with zoom/pan [#7199]
• Fix source map of the mablibre dependency [#7204]
• Fix years in license [#7205]
• Maintain layout images element identity based on coordinates,
  for smoother updates when you add or remove images early in the list. [#7277]
• Fix handling of new domain values given in the Plotly.react function to
  prevent loss of new domain values. [#7283]

Fixed

• Fix require path to maplibre-gl.css (regression introduced in 2.35.1) [#7146],
  with thanks to @birkskyum for the contribution!

Fixed

• Fix rendering traces with zorder on overlayed subplots case of multiple traces in each subplot [#7141]
• Fix missing CSS for map(maplibre) subplots when used offline [#7140],
  with thanks to @birkskyum for the contribution!

Added

• Add new traces: scattermap, choroplethmap and densitymap and map subplots which use maplibre to render maps [#7015, #7060, #7085, #7088, #7090, #7092, #7094, #7134],
  with thanks to @birkskyum for the contribution!

Changed

• Deprecate mapbox traces and mapbox subplot [#7087]
• Drop obsolete npm v6 installation [#7095]
• Use Node.js v18 and npm v10 in development [#7078]
• Update npm lockfile to v3 [#7099]
• Update turf to v7 [#7116]

Fixed

• Fix centroid calculation in turf [#7115],
  with thanks to @birkskyum for the contribution!
• Fix missing cursor for Ternary Plot[#7057],
  with thanks to @Lexachoc for the contribution!
• Elaborate on the Custom Bundle guide [#7101]

Added

• Add subtitle attribute to layout.title to enable adding subtitles to plots [#7012]
• Introduce "u" and "s" pseudo html tags to add partial underline and strike-through styles to SVG text elements [#7043]
• Add geometric mean functionality and 'geometric mean ascending' + 'geometric mean descending' to category_order on cartesian axes [#6223],
  with thanks to @acxz and @prabhathc for the contribution!
• Add axis property ticklabelindex for drawing the label for each minor tick n positions away from a major tick,
  with thanks to @my-tien for the contribution! [#7036]
• Add property ticklabelstandoff and ticklabelshift to cartesian axes to adjust positioning of tick labels,
  with thanks to @my-tien for the contribution! [#7006]
• Add x0shift, x1shift, y0shift, y1shift to shapes to add control over positioning of shape vertices on (multi-)category axes,
  with thanks to @my-tien for the contribution! [#7005]

Fixed

• Fix displaying scattergl traces while zooming or panning (regression introduced in 2.26.0) [#7018],
  with thanks to @eiriklv for the contribution!
• Fix for excessive hoverlabel removal and overlap for plots with both scatter and bar traces [#6954],
  with thanks to @mbant for the contribution!
• Fix adding cartesian "togglehover" when included in modebar.add [#5879],
  with thanks to @Sizurka for the contribution!
• Handle zorder between overlaying cartesian subplots [#7032],
  This feature was anonymously sponsored: thank you to our sponsor!