Release Notes for v40.0.0

Stack Upgrades

• Chromium 144.0.7559.60
  • New in 144
  • New in 143
• Node v24.11.1
  • Node 24.11.1 blog post
• V8 14.4

Breaking Changes

• Deprecated clipboard API access from renderer processes #48923
• Fixed an error on debug symbol upload by moving dsym.zip to use tar.xz compression. #48952

Features

Additions

• Added "memory-eviction" as a possible reason for a child process to exit. #48362
• Added RGBAF16 output format with scRGB HDR color space support to Offscreen Rendering. #48265 ^{(Also in 39)}
• Added app.isHardwareAccelerationEnabled(). #47614 ^{(Also in 37, 38, 39)}
• Added bypassCustomProtocolHandlers option to net.request. #48883 ^{(Also in 38, 39)}
• Added methods to enable more granular accessibility support management. #48042 ^{(Also in 37, 38, 39)}
• Added support for WebSocket authentication through the login event on webContents. #49064 ^{(Also in 39)}
• Added support to import external shared texture as VideoFrame. #48831
• Added the ability to retrieve the system accent color on Linux using systemPreferences.getAccentColor. #48027 ^{(Also in 39)}
• Allowed for persisting File System API grant status within a given session. #48170 ^{(Also in 37, 38, 39)}
• Automatically focus DevTools when element is inspected or breakpoint is triggered. #46386 ^{(Also in 37, 38, 39)}

Improvements

• Enables resetting accent color to follow system accent settings if a previous color has been set via window.setAccentColor(null). #48274 ^{(Also in 38, 39)}
• Support dynamic ESM imports in non-context isolated preloads. #48375 ^{(Also in 37, 38, 39)}
• Updated nativeImage.createFromNamedImage to support SF Symbol names. #48772 ^{(Also in 39)}

Fixes

• Added support for --no-stdio-init to be used when nul device is disabled on windows. #47870
• Fixed an issue on Windows and Linux where no cookie encryption key provider was passed into the network service when cookie encryption was enabled. #49375
• Fixed an issue where no cookie encryption provider was passed into the network service when cookie encryption was enabled. #49350
• Fixed crash when attempting to resolve modules during process exit. #49104
• Fixed drag regions in child windows. #49312
• Fixed draw smoothing round corner issue. #48782
• Fixed the cookie encryption logic to use the old os_crypt sync implementation present in M142. #49384
• Fixed visual artifacts while resizing a window on Windows. #49191

Also in earlier versions...

• AccentColor set distinguishes the frame. #48405 ^{(Also in 37, 38, 39)}
• Corrected the appearance of tiled windows on GNOME (when frame: true), and removed resize handles from tiled edges. #48835 ^{(Also in 38, 39)}
• Fix: ESM-from-CJS import when CJK characters are in path. #48862 ^{(Also in 39)}
• Fix: runtime JS error that crashes GetPackageJSON. #48293 ^{(Also in 37, 38, 39)}
• Fixed Wayland configuration through the XDG_SESSION_TYPE environment variable. #48301 ^{(Also in 38, 39)}
• Fixed Windows dialog.showMessageBox default button handling. #48216 ^{(Also in 36, 37, 38, 39)}
• Fixed a Windows notification issue where clicking a native notification would result in an application hang on certain Windows environments. #49129 ^{(Also in 39)}
• Fixed a potential crash in dialog.showOpenDialog on Windows with an empty extension filter array. #48640 ^{(Also in 37, 38, 39)}
• Fixed an application crash when clicking or hovering over the native MacOS "Window" menu. Reverts #48598. #48799 ^{(Also in 37, 38, 39)}
• Fixed an error when checking environmental variables when using remote checksums when installing Electron via npm. #48634 ^{(Also in 37, 38, 39)}
• Fixed an issue that menu items on macOS could not be disabled under all circumstances. #48598 ^{(Also in 37, 38, 39)}
• Fixed an issue where menu-did-close was not emitted properly for some application menus. #49092 ^{(Also in 38, 39)}
• Fixed an issue where shell.openExternal caused an unexpected dialog to open when there was no app suitable to open the url. #48502 ^{(Also in 38, 39)}
• Fixed an issue where systemPreferences.getAccentColor inverted the color. #48511 ^{(Also in 37, 38, 39)}
• Fixed an issue where trafficLightPosition would not be correctly applied when using titleBarStyle: 'customButtonsOnHover' on macOS 26. #48538 ^{(Also in 37, 38, 39)}
• Fixed an issue where authentication via websockets can crash. #48510 ^{(Also in 37, 38, 39)}
• Fixed an issue where button background on mouse hover with titleBarOverlay wasn't always calculated to provide appropriate minimum contrast. #48568 ^{(Also in 37, 38, 39)}
• Fixed an issue where calling webContents.openDevTools({ mode: 'detach' }) would cause a crash on Wayland. #48600 ^{(Also in 38, 39)}
• Fixed an issue where changing the resizable property on a window would break the styles of a transparent window. #48378 ^{(Also in 37, 38, 39)}
• Fixed an issue where icons didn't show up as expected on Windows Toast notifications. #48543 ^{(Also in 38, 39)}
• Fixed an issue where snapped windows aren't correctly snapped when minimized and then unminimized. #48296 ^{(Also in 37, 38, 39)}
• Fixed an issue where some apps would throw an exception on launch. #48976 ^{(Also in 39)}
• Fixed an issue where the close callback param for menu.popup would fire when any arbitrary submenu of the given menu closed, and not the menu itself. #49046 ^{(Also in 38, 39)}
• Fixed crash on windows when UTF-8 is in path. #48942 ^{(Also in 38, 39)}
• Fixed crash when accessing webContents.session or webContents.debugger. #48318 ^{(Also in 39)}
• Fixed crash when creating event object for ipc events. #48991 ^{(Also in 39)}
• Fixed crash when inspector agent attempts to evaluate on provisional frames. #48503 ^{(Also in 37, 38, 39)}
• Fixed crash when passing feature param from commandline --enable-features=Feature:ParamA/Value. #48411 ^{(Also in 39)}
• Fixed crash when reading system certificates via nodejs tls module. #49041 ^{(Also in 39)}
• Fixed download button does not work in PDF Viewer. #48372 ^{(Also in 38, 39)}
• Fixed excessive WindowServer GPU usage on macOS Tahoe 26. #48376 ^{(Also in 36, 37, 38, 39)}
• Fixed high CPU usage with <input> tag on macOS 26. #48379 ^{(Also in 36, 37, 38, 39)}
• Fixed incorrect signal variable reference in nan-spec-runner that could cause install failures to go undetected. #48639 ^{(Also in 38, 39)}
• Fixed oom crash when optimizing certain wasm functions involving large phi nodes. #48816 ^{(Also in 38, 39)}
• Fixed shader-f16 to work on Windows. #48342 ^{(Also in 37, 38, 39)}
• Fixed the issue where the parent window leave disabled after the modal window call show() multiple time. #49021 ^{(Also in 38, 39)}
• Fixed the issue where the parent window remained interactive after the modal window was opened. #48864 ^{(Also in 38, 39)}
• Fixed white flash on call to BrowserWindow.show. #47151 ^{(Also in 37, 38, 39)}
• Reenable V8 trap handlers for wasm in browser and utility process, improves runtime execution of wasm. #48839 ^{(Also in 39)}
• Requests sent via net are now capable of having their headers modified to use reserved headers via webRequest. #49241 ^{(Also in 39)}
• Titlebar buttons now appear on the correct side of windows on Wayland in Ubuntu. #48490 ^{(Also in 38, 39)}
• Windows: Calling window.setFocusable(true) will no longer cause a window to lose focus. #48927 ^{(Also in 39)}

Other Changes

• Backported fix for 445380761. #48335 ^{(Also in 36, 37, 38, 39)}
• Backported fix for 466786677. #49286
• Backported fix for chromium:466192044. #49201
• Fixed a development issue where the metal toolchain could not be found when building on macOS 26. #48467 ^{(Also in 37, 38, 39)}
• Fixed devtools element panel flickering when with node inspection. #49043 ^{(Also in 39)}

Documentation

• Documentation change
  • #48665
  • #48841

Notices

End of Support for 37.x.y

Electron 37.x.y has reached end-of-support as per the project's support policy. Developers and applications are encouraged to upgrade to a newer version of Electron.