Fixed

• Update plot with all config changes during call to Plotly.react [#7475]
• Fix wheel event handler Violation in Chromium by setting passive: true [#7517]
• Fix locationmode warning to be less aggressive: show warning only when locationmode is 'country names' [#7520]
• Refactor drawMainTitle to use context-specific selections for title and subtitle, avoiding conflicts when multiple plots are present on the same page [#7522], with thanks to @davibarbosa2 for the contribution!
• Fix broken styling of map attributions [#7526]
• Calculate colorscale properly for histogram when marker cmin/cmax/cmid values are undefined [#7534]
• Tidy up some stray characters in attribute descriptions [#7539], [#7540]
• Fix some typos (and a conditional check) [#7542], with thanks to @musvaage for the contribution!
• Fix cropping of subunits in USA topojson, clean up land and coastlines layers for all topojson [#7555]
• Fix issue causing empty ScatterGL plots when using text elements #7563

Full Changelog: v3.1.0...v3.1.1

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 modebardisable attribute to cartesian axes, to allow fine control over which buttons affect which axes [#7358]
• Add support for ticklabelposition "inside"/"outside" for category axes with tickson set to "boundaries" [#7420],
  with thanks to @my-tien for the contribution!
• Add unifiedhovertitle.text to format unified hover titles [#7439]
• Add layout.hoverlabel.showarrow (and trace.hoverlabel.showarrow) attribute to allow hiding the triangular caret that appears on the hover label box [#7451]
• Add minorloglabels to cartesian axes [#7468]
• Make modebar keyboard-accessible via tabbing [#7492], with thanks to @davidangarita1 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]
• Refactor files related to UN topojson [#7481]
• Update default topojsonURL to point to new UN topojson [#7514]
• Add breaking change warning for country names locationmode option in choropleth, scattergeo plots [#7514]

Fixed

• 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 hidden ticklabels taking up plot space [#7417]
• Fix editable shapes (regression introduced in 2.34.0) [#7470], with thanks to @my-tien for the contribution!
• Update legend maxheight calculation logic [#7483]
• Fix hover event not triggered on consecutive empty bins (count=0) with hovermode:'x' for histogram [#7503], with thanks to @Lexachoc for the contribution!
• Remove form-data nested dependency associated with CVE-2025-7783 [#7514], with thanks to @KyleBoyer for the contribution!

Added

• Add modebardisable attribute to cartesian axes, to allow fine control over which buttons affect which axes [#7358]
• Add unifiedhovertitle.text to format unified hover titles [#7439]
• Add layout.hoverlabel.showarrow (and trace.hoverlabel.showarrow) attribute to allow hiding the triangular caret that appears on the hover label box [#7451]
• Add minorloglabels to cartesian axes [#7468]
• Make modebar keyboard-accessible via tabbing [#7492], with thanks to @davidangarita1 for the contribution!

Changed

• Refactor files related to UN topojson [#7481]

Fixed

• Fix hidden ticklabels taking up plot space [#7417]
• Fix editable shapes (regression introduced in 2.34.0) [#7470],
  with thanks to @my-tien for the contribution!

Fixed

• Remove detailed description of font options [7348]

Fixed

• Fix installing dependencies in node v22 [#7381], with thanks to @chaigh-uk for the contribution!
• Fix Persian calendar leap year [#7456]
• Fix scroll wheel zoom for geo subplots in Safari [#7474]
• Add method to check for WebKit WebView user agent string [#7479]
• Fix edit colorbar title [7487]

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]