# WebPreferences Object

* `devTools` boolean (optional) - Whether to enable DevTools. If it is set to `false`, can not use `BrowserWindow.webContents.openDevTools()` to open DevTools. Default is `true`.
* `nodeIntegration` boolean (optional) - Whether node integration is enabled.
  Default is `false`.
* `nodeIntegrationInWorker` boolean (optional) - Whether node integration is
  enabled in web workers. Default is `false`. More about this can be found
  in [Multithreading](../../tutorial/multithreading.md).
* `nodeIntegrationInSubFrames` boolean (optional) - Experimental option for
  enabling Node.js support in sub-frames such as iframes and child windows. All your preloads will load for
  every iframe, you can use `process.isMainFrame` to determine if you are
  in the main frame or not.
* `preload` string (optional) - Specifies a script that will be loaded before other
  scripts run in the page. This script will always have access to node APIs
  no matter whether node integration is turned on or off. The value should
  be the absolute file path to the script.
  When node integration is turned off, the preload script can reintroduce
  Node global symbols back to the global scope. See example
  [here](../context-bridge.md#exposing-node-global-symbols).
* `sandbox` boolean (optional) - If set, this will sandbox the renderer
  associated with the window, making it compatible with the Chromium
  OS-level sandbox and disabling the Node.js engine. This is not the same as
  the `nodeIntegration` option and the APIs available to the preload script
  are more limited. Read more about the option [here](../../tutorial/sandbox.md).
* `session` [Session](../session.md#class-session) (optional) - Sets the session used by the
  page. Instead of passing the Session object directly, you can also choose to
  use the `partition` option instead, which accepts a partition string. When
  both `session` and `partition` are provided, `session` will be preferred.
  Default is the default session.
* `partition` string (optional) - Sets the session used by the page according to the
  session's partition string. If `partition` starts with `persist:`, the page
  will use a persistent session available to all pages in the app with the
  same `partition`. If there is no `persist:` prefix, the page will use an
  in-memory session. By assigning the same `partition`, multiple pages can share
  the same session. Default is the default session.
* `zoomFactor` number (optional) - The default zoom factor of the page, `3.0` represents
  `300%`. Default is `1.0`.
* `javascript` boolean (optional) - Enables JavaScript support. Default is `true`.
* `webSecurity` boolean (optional) - When `false`, it will disable the
  same-origin policy (usually using testing websites by people), and set
  `allowRunningInsecureContent` to `true` if this options has not been set
  by user. Default is `true`.
* `allowRunningInsecureContent` boolean (optional) - Allow an https page to run
  JavaScript, CSS or plugins from http URLs. Default is `false`.
* `images` boolean (optional) - Enables image support. Default is `true`.
* `imageAnimationPolicy` string (optional) - Specifies how to run image animations (E.g. GIFs).  Can be `animate`, `animateOnce` or `noAnimation`.  Default is `animate`.
* `textAreasAreResizable` boolean (optional) - Make TextArea elements resizable. Default
  is `true`.
* `webgl` boolean (optional) - Enables WebGL support. Default is `true`.
* `plugins` boolean (optional) - Whether plugins should be enabled. Default is `false`.
* `experimentalFeatures` boolean (optional) - Enables Chromium's experimental features.
  Default is `false`.
* `scrollBounce` boolean (optional) _macOS_ - Enables scroll bounce
  (rubber banding) effect on macOS. Default is `false`.
* `enableBlinkFeatures` string (optional) - A list of feature strings separated by `,`, like
  `CSSVariables,KeyboardEventKey` to enable. The full list of supported feature
  strings can be found in the [RuntimeEnabledFeatures.json5][runtime-enabled-features]
  file.
* `disableBlinkFeatures` string (optional) - A list of feature strings separated by `,`,
  like `CSSVariables,KeyboardEventKey` to disable. The full list of supported
  feature strings can be found in the
  [RuntimeEnabledFeatures.json5][runtime-enabled-features] file.
* `defaultFontFamily` Object (optional) - Sets the default font for the font-family.
  * `standard` string (optional) - Defaults to `Times New Roman`.
  * `serif` string (optional) - Defaults to `Times New Roman`.
  * `sansSerif` string (optional) - Defaults to `Arial`.
  * `monospace` string (optional) - Defaults to `Courier New`.
  * `cursive` string (optional) - Defaults to `Script`.
  * `fantasy` string (optional) - Defaults to `Impact`.
  * `math` string (optional) - Defaults to `Latin Modern Math`.
* `defaultFontSize` Integer (optional) - Defaults to `16`.
* `defaultMonospaceFontSize` Integer (optional) - Defaults to `13`.
* `minimumFontSize` Integer (optional) - Defaults to `0`.
* `defaultEncoding` string (optional) - Defaults to `ISO-8859-1`.
* `backgroundThrottling` boolean (optional) - Whether to throttle animations and timers
  when the page becomes background. This also affects the
  [Page Visibility API](../browser-window.md#page-visibility). When at least one
  [webContents](../web-contents.md) displayed in a single
  [browserWindow](../browser-window.md) has disabled `backgroundThrottling` then
  frames will be drawn and swapped for the whole window and other
  [webContents](../web-contents.md) displayed by it. Defaults to `true`.
* `offscreen` boolean (optional) - Whether to enable offscreen rendering for the browser
  window. Defaults to `false`. See the
  [offscreen rendering tutorial](../../tutorial/offscreen-rendering.md) for
  more details.
* `contextIsolation` boolean (optional) - Whether to run Electron APIs and
  the specified `preload` script in a separate JavaScript context. Defaults
  to `true`. The context that the `preload` script runs in will only have
  access to its own dedicated `document` and `window` globals, as well as
  its own set of JavaScript builtins (`Array`, `Object`, `JSON`, etc.),
  which are all invisible to the loaded content. The Electron API will only
  be available in the `preload` script and not the loaded page. This option
  should be used when loading potentially untrusted remote content to ensure
  the loaded content cannot tamper with the `preload` script and any
  Electron APIs being used.  This option uses the same technique used by
  [Chrome Content Scripts][chrome-content-scripts].  You can access this
  context in the dev tools by selecting the 'Electron Isolated Context'
  entry in the combo box at the top of the Console tab.
* `webviewTag` boolean (optional) - Whether to enable the [`<webview>` tag](../webview-tag.md).
  Defaults to `false`. **Note:** The
  `preload` script configured for the `<webview>` will have node integration
  enabled when it is executed so you should ensure remote/untrusted content
  is not able to create a `<webview>` tag with a possibly malicious `preload`
  script. You can use the `will-attach-webview` event on [webContents](../web-contents.md)
  to strip away the `preload` script and to validate or alter the
  `<webview>`'s initial settings.
* `additionalArguments` string[] (optional) - A list of strings that will be appended
  to `process.argv` in the renderer process of this app.  Useful for passing small
  bits of data down to renderer process preload scripts.
* `safeDialogs` boolean (optional) - Whether to enable browser style
  consecutive dialog protection. Default is `false`.
* `safeDialogsMessage` string (optional) - The message to display when
  consecutive dialog protection is triggered. If not defined the default
  message would be used, note that currently the default message is in
  English and not localized.
* `disableDialogs` boolean (optional) - Whether to disable dialogs
  completely. Overrides `safeDialogs`. Default is `false`.
* `navigateOnDragDrop` boolean (optional) - Whether dragging and dropping a
  file or link onto the page causes a navigation. Default is `false`.
* `autoplayPolicy` string (optional) - Autoplay policy to apply to
  content in the window, can be `no-user-gesture-required`,
  `user-gesture-required`, `document-user-activation-required`. Defaults to
  `no-user-gesture-required`.
* `disableHtmlFullscreenWindowResize` boolean (optional) - Whether to
  prevent the window from resizing when entering HTML Fullscreen. Default
  is `false`.
* `accessibleTitle` string (optional) - An alternative title string provided only
  to accessibility tools such as screen readers. This string is not directly
  visible to users.
* `spellcheck` boolean (optional) - Whether to enable the builtin spellchecker.
  Default is `true`.
* `enableWebSQL` boolean (optional) - Whether to enable the [WebSQL api](https://www.w3.org/TR/webdatabase/).
  Default is `true`.
* `v8CacheOptions` string (optional) - Enforces the v8 code caching policy
  used by blink. Accepted values are
  * `none` - Disables code caching
  * `code` - Heuristic based code caching
  * `bypassHeatCheck` - Bypass code caching heuristics but with lazy compilation
  * `bypassHeatCheckAndEagerCompile` - Same as above except compilation is eager.
  Default policy is `code`.
* `enablePreferredSizeMode` boolean (optional) - Whether to enable
  preferred size mode. The preferred size is the minimum size needed to
  contain the layout of the document—without requiring scrolling. Enabling
  this will cause the `preferred-size-changed` event to be emitted on the
  `WebContents` when the preferred size changes. Default is `false`.

[chrome-content-scripts]: https://developer.chrome.com/extensions/content_scripts#execution-environment
[runtime-enabled-features]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/platform/runtime_enabled_features.json5
