The window object represents a window containing a DOM document; the document property points to the DOM document loaded in that window. A window for a given document can be obtained using the document.defaultView property.

This section provides a brief reference for all of the methods, properties, and events available through the DOM window object. The window object implements the Window interface, which in turn inherits from the AbstractView interface. Some additional global functions, namespaces, objects, interfaces, and constructors, not typically associated with the window, but available on it, are listed in the JavaScript Reference and DOM Reference.

In a tabbed browser, such as Firefox, each tab contains its own window object (and if you're writing an extension, the browser window itself is a separate window too - see Working with windows in chrome code for more information). That is, the window object is not shared between tabs in the same window. Some methods, namely window.resizeTo and window.resizeBy apply to the whole window and not to the specific tab the window object belongs to. Generally, anything that can't reasonably pertain to a tab pertains to the window instead.

Properties

This interface inherits properties from the EventTarget interface and implements properties from the WindowOrWorkerGlobalScope and WindowEventHandlers mixins.

Note that properties which are objects (e.g.,. for overriding the prototype of built-in elements) are listed in a separate section below.

Window.closed Read only
This property indicates whether the current window is closed or not.
Window.console Read only
Returns a reference to the console object which provides access to the browser's debugging console.
Window.content and Window._content Read only
Returns a reference to the content element in the current window. Since Firefox 57 (initially Nightly-only), both versions are only available from chrome (privileged) code, and not available to the web anymore.
Window.controllers Read only
Returns the XUL controller objects for the current chrome window.
Window.customElements Read only
returns a reference to the CustomElementRegistry object, which can be used to register new custom elements and get information about previously registered custom elements.
Window.crypto Read only
Returns the browser crypto object.
Window.defaultStatus Obsolete since Gecko 23
Gets/sets the status bar text for the given window.
Window.devicePixelRatio Read only
Returns the ratio between physical pixels and device independent pixels in the current display.
Window.dialogArguments Read only
Gets the arguments passed to the window (if it's a dialog box) at the time window.showModalDialog() was called. This is an nsIArray.
Window.directories
Synonym of window.personalbar
Window.document Read only
Returns a reference to the document that the window contains.
Window.DOMMatrix Read only
Returns a reference to a DOMMatrix object, which represents 4x4 matrices, suitable for 2D and 3D operations.
Window.DOMMatrixReadOnly Read only
Returns a reference to a DOMMatrixReadOnly object, which represents 4x4 matrices, suitable for 2D and 3D operations.
Window.DOMPoint Read only
Returns a reference to a DOMPoint object, which represents a 2D or 3D point in a coordinate system.
Window.DOMPointReadOnly Read only
Returns a reference to a DOMPointReadOnly object, which represents a 2D or 3D point in a coordinate system.
Window.DOMQuad Read only
Returns a reference to a DOMQuad object, which provides represents a quadrilaterial object, that is one having four corners and four sides.
Window.DOMRect Read only
Returns a reference to a DOMRect object, which represents a rectangle.
Window.DOMRectReadOnly Read only
Returns a reference to a DOMRectReadOnly object, which represents a rectangle.
Window.frameElement Read only
Returns the element in which the window is embedded, or null if the window is not embedded.
Window.frames Read only
Returns an array of the subframes in the current window.
Window.fullScreen
This property indicates whether the window is displayed in full screen or not.
Window.globalStorage Obsolete since Gecko 13
Unsupported since Gecko 13 (Firefox 13). Use Window.localStorage instead.
Was: Multiple storage objects that are used for storing data across multiple pages.
Window.history Read only
Returns a reference to the history object.
Window.innerHeight Read only
Gets the height of the content area of the browser window including, if rendered, the horizontal scrollbar.
Window.innerWidth Read only
Gets the width of the content area of the browser window including, if rendered, the vertical scrollbar.
Window.isSecureContext Read only
Indicates whether a context is capable of using features that require secure contexts.
Window.length Read only
Returns the number of frames in the window. See also window.frames.
Window.location
Gets/sets the location, or current URL, of the window object.
Window.locationbar Read only
Returns the locationbar object, whose visibility can be toggled in the window.
Window.localStorage Read only
Returns a reference to the local storage object used to store data that may only be accessed by the origin that created it.
Window.menubar Read only
Returns the menubar object, whose visibility can be toggled in the window.
Window.messageManager
Returns the message manager object for this window.
Window.mozAnimationStartTime Read only
The time in milliseconds since epoch at which the current animation cycle began. Use Animation.startTime instead.
Window.mozInnerScreenX Read only
Returns the horizontal (X) coordinate of the top-left corner of the window's viewport, in screen coordinates. This value is reported in CSS pixels. See mozScreenPixelsPerCSSPixel in nsIDOMWindowUtils for a conversion factor to adapt to screen pixels if needed.
Window.mozInnerScreenY Read only
Returns the vertical (Y) coordinate of the top-left corner of the window's viewport, in screen coordinates. This value is reported in CSS pixels. See mozScreenPixelsPerCSSPixel for a conversion factor to adapt to screen pixels if needed.
Window.mozPaintCount Read only
Returns the number of times the current document has been rendered to the screen in this window. This can be used to compute rendering performance.
Window.name
Gets/sets the name of the window.
Window.navigator Read only
Returns a reference to the navigator object.
Window.opener
Returns a reference to the window that opened this current window.
Window.orientation Read only
Returns the orientation in degrees (in 90 degree increments) of the viewport relative to the device's natural orientation.
Window.outerHeight Read only
Gets the height of the outside of the browser window.
Window.outerWidth Read only
Gets the width of the outside of the browser window.
Window.pageXOffset Read only
An alias for window.scrollX.
Window.pageYOffset Read only
An alias for window.scrollY
Window.parent Read only
Returns a reference to the parent of the current window or subframe.
Window.performance Read only
Returns a Performance object, which includes the timing and navigation attributes, each of which is an object providing performance-related data. See also Using Navigation Timing for additional information and examples.
Window.personalbar Read only
Returns the personalbar object, whose visibility can be toggled in the window.
Window.pkcs11 Obsolete since Gecko 29
Formerly provided access to install and remove PKCS11 modules.
Window.returnValue
The return value to be returned to the function that called window.showModalDialog() to display the window as a modal dialog.
Window.screen Read only
Returns a reference to the screen object associated with the window.
Window.screenX Read only
Returns the horizontal distance of the left border of the user's browser from the left side of the screen.
Window.screenY Read only
Returns the vertical distance of the top border of the user's browser from the top side of the screen.
Window.scrollbars Read only
Returns the scrollbars object, whose visibility can be toggled in the window.
Window.scrollMaxX Read only
The maximum offset that the window can be scrolled to horizontally, that is the document width minus the viewport width.
Window.scrollMaxY Read only
The maximum offset that the window can be scrolled to vertically (i.e., the document height minus the viewport height).
Window.scrollX Read only
Returns the number of pixels that the document has already been scrolled horizontally.
Window.scrollY Read only
Returns the number of pixels that the document has already been scrolled vertically.
Window.self Read only
Returns an object reference to the window object itself.
Window.sessionStorage
Returns a reference to the session storage object used to store data that may only be accessed by the origin that created it.
Window.sidebar Read only
Returns a reference to the window object of the sidebar.
Window.speechSynthesis Read only
Returns a SpeechSynthesis object, which is the entry point into using Web Speech API speech synthesis functionality.
Window.status
Gets/sets the text in the statusbar at the bottom of the browser.
Window.statusbar Read only
Returns the statusbar object, whose visibility can be toggled in the window.
Window.toolbar Read only
Returns the toolbar object, whose visibility can be toggled in the window.
Window.top Read only
Returns a reference to the topmost window in the window hierarchy. This property is read only.
Window.visualViewport Read only
Returns a VisualViewport object which represents the visual viewport for a given window.
Window.window Read only
Returns a reference to the current window.
window[0], window[1], etc.
Returns a reference to the window object in the frames. See Window.frames for more details.

Properties implemented from elsewhere

WindowOrWorkerGlobalScope.caches Read only
Returns the CacheStorage object associated with the current context. This object enables functionality such as storing assets for offline use, and generating custom responses to requests.
WindowOrWorkerGlobalScope.indexedDB Read only
Provides a mechanism for applications to asynchronously access capabilities of indexed databases; returns an IDBFactory object.
WindowOrWorkerGlobalScope.isSecureContext Read only
Returns a boolean indicating whether the current context is secure (true) or not (false).
WindowOrWorkerGlobalScope.origin Read only
Returns the global object's origin, serialized as a string. (This does not yet appear to be implemented in any browser.)

Methods

This interface inherits methods from the EventTarget interface and implements methods from WindowOrWorkerGlobalScope and EventTarget.

Window.alert()
Displays an alert dialog.
Window.back()
Moves back one in the window history.
Window.blur()
Sets focus away from the window.
Window.cancelAnimationFrame() 
Enables you to cancel a callback previously scheduled with Window.requestAnimationFrame.
Window.cancelIdleCallback() 
Enables you to cancel a callback previously scheduled with Window.requestIdleCallback.
Window.captureEvents()
Registers the window to capture all events of the specified type.
Window.clearImmediate()
Cancels the repeated execution set using setImmediate.
Window.close()
Closes the current window.
Window.confirm()
Displays a dialog with a message that the user needs to respond to.
Window.disableExternalCapture() Obsolete since Gecko 24
FIXME: NeedsContents
Window.dispatchEvent()
Used to trigger an event.
Window.dump()
Writes a message to the console.
Window.enableExternalCapture() Obsolete since Gecko 24
FIXME: NeedsContents
Window.find()
Searches for a given string in a window.
Window.focus()
Sets focus on the current window.
Window.forward()
Moves the window one document forward in the history.
Window.getAttention()
Flashes the application icon.
Window.getAttentionWithCycleCount()
FIXME: NeedsContents
Window.getComputedStyle()
Gets computed style for the specified element. Computed style indicates the computed values of all CSS properties of the element.
Window.getDefaultComputedStyle() 
Gets default computed style for the specified element, ignoring author stylesheets.
Window.getSelection()
Returns the selection object representing the selected item(s).
Window.home()
Returns the browser to the home page.
Window.matchMedia()
Returns a MediaQueryList object representing the specified media query string.
Window.maximize()
FIXME: NeedsContents
Window.minimize() (top-level XUL windows only)
Minimizes the window.
Window.moveBy()
Moves the current window by a specified amount.
Window.moveTo()
Moves the window to the specified coordinates.
Window.open()
Opens a new window.
Window.openDialog()
Opens a new dialog window.
Window.postMessage()
Provides a secure means for one window to send a string of data to another window, which need not be within the same domain as the first.
Window.print()
Opens the Print Dialog to print the current document.
Window.prompt()
Returns the text entered by the user in a prompt dialog.
Window.releaseEvents()
Releases the window from trapping events of a specific type.
Window.requestAnimationFrame()
Tells the browser that an animation is in progress, requesting that the browser schedule a repaint of the window for the next animation frame.
Window.requestIdleCallback()  
Enables the scheduling of tasks during a browser's idle periods.
Window.resizeBy()
Resizes the current window by a certain amount.
Window.resizeTo()
Dynamically resizes window.
Window.restore()
FIXME: NeedsContents
Window.routeEvent() Obsolete since Gecko 24
FIXME: NeedsContents
Window.scroll()
Scrolls the window to a particular place in the document.
Window.scrollBy()
Scrolls the document in the window by the given amount.
Window.scrollByLines()
Scrolls the document by the given number of lines.
Window.scrollByPages()
Scrolls the current document by the specified number of pages.
Window.scrollTo()
Scrolls to a particular set of coordinates in the document.
Window.setCursor() (top-level XUL windows only)
Changes the cursor for the current window
Window.setImmediate()
Executes a function after the browser has finished other heavy tasks
Window.setResizable()
Toggles a user's ability to resize a window.
Window.sizeToContent()
Sizes the window according to its content.
Window.stop()
This method stops window loading.
Window.updateCommands()
Updates the state of commands of the current chrome window (UI).

Methods implemented from elsewhere

EventTarget.addEventListener()
Register an event handler to a specific event type on the window.
WindowOrWorkerGlobalScope.atob()
Decodes a string of data which has been encoded using base-64 encoding.
WindowOrWorkerGlobalScope.btoa()
Creates a base-64 encoded ASCII string from a string of binary data.
WindowOrWorkerGlobalScope.clearInterval()
Cancels the repeated execution set using WindowOrWorkerGlobalScope.setInterval().
WindowOrWorkerGlobalScope.clearTimeout()
Cancels the delayed execution set using WindowOrWorkerGlobalScope.setTimeout().
WindowOrWorkerGlobalScope.createImageBitmap()
Accepts a variety of different image sources, and returns a Promise which resolves to an ImageBitmap. Optionally the source is cropped to the rectangle of pixels originating at (sx, sy) with width sw, and height sh.
WindowOrWorkerGlobalScope.fetch()
Starts the process of fetching a resource from the network.
EventTarget.removeEventListener
Removes an event listener from the window.
WindowOrWorkerGlobalScope.setInterval()
Schedules a function to execute every time a given number of milliseconds elapses.
WindowOrWorkerGlobalScope.setTimeout()
Schedules a function to execute in a given amount of time.

Obsolete methods

Window.showModalDialog()
Displays a modal dialog. This method was removed completely in Chrome 43, and Firefox 55.

Event handlers

These are properties of the window object that can be set to establish event handlers for the various things that can happen in the window that might be of interest.

This interface inherits event handlers from the EventTarget interface and implements event handlers from WindowEventHandlers.

Note: Starting in Gecko 9.0, you can now use the syntax if ("onabort" in window) to determine whether or not a given event handler property exists. This is because event handler interfaces have been updated to be proper web IDL interfaces. See DOM event handlers for details.

Window.onappinstalled
Called when the page is installed as a webapp. See appinstalled event.
Window.onbeforeinstallprompt
An event handler property dispatched before a user is prompted to save a web site to a home screen on mobile.
Window.ondevicelight
An event handler property for any ambient light levels changes
Window.ondevicemotion
Called if accelerometer detects a change (For mobile devices)
Window.ondeviceorientation
Called when the orientation is changed (For mobile devices)
Window.ondeviceorientationabsolute  Chrome only
An event handler property for any device orientation changes.
Window.ondeviceproximity
An event handler property for device proximity event
Window.ongamepadconnected
Represents an event handler that will run when a gamepad is connected (when the gamepadconnected event fires).
Window.ongamepaddisconnected
Represents an event handler that will run when a gamepad is disconnected (when the gamepaddisconnected event fires).
Window.onmozbeforepaint
An event handler property for the MozBeforePaint event, which is sent before repainting the window if the event has been requested by a call to the Window.mozRequestAnimationFrame() method.
Window.onpaint
An event handler property for paint events on the window.
Window.onrejectionhandled
An event handler for handled Promise rejection events.
Window.onuserproximity
An event handler property for user proximity events.
Window.onvrdisplayconnect
Represents an event handler that will run when a compatible VR device has been connected to the computer (when the vrdisplayconnected event fires).
Window.onvrdisplaydisconnect
Represents an event handler that will run when a compatible VR device has been disconnected from the computer (when the vrdisplaydisconnected event fires).
Window.onvrdisplayactivate
Represents an event handler that will run when a display is able to be presented to (when the vrdisplayactivate event fires), for example if an HMD has been moved to bring it out of standby, or woken up by being put on.
Window.onvrdisplaydeactivate
Represents an event handler that will run when a display can no longer be presented to (when the vrdisplaydeactivate event fires), for example if an HMD has gone into standby or sleep mode due to a period of inactivity.
Window.onvrdisplayblur
Represents an event handler that will run when presentation to a display has been paused for some reason by the browser, OS, or VR hardware (when the vrdisplayblur event fires) — for example, while the user is interacting with a system menu or browser, to prevent tracking or loss of experience.
Window.onvrdisplayfocus
Represents an event handler that will run when presentation to a display has resumed after being blurred (when the vrdisplayfocus event fires).
Window.onvrdisplaypresentchange
represents an event handler that will run when the presenting state of a VR device changes — i.e. goes from presenting to not presenting, or vice versa (when the vrdisplaypresentchange event fires).

Event handlers implemented from elsewhere

GlobalEventHandlers.onabort
Called when the loading of a resource has been aborted, such as by a user canceling the load while it is still in progress
WindowEventHandlers.onafterprint
Called when the print dialog box is closed. See afterprint event.
WindowEventHandlers.onbeforeprint
Called when the print dialog box is opened. See beforeprint event.
WindowEventHandlers.onbeforeunload
An event handler property for before-unload events on the window.
GlobalEventHandlers.onblur
Called after the window loses focus, such as due to a popup.
GlobalEventHandlers.onchange
An event handler property for change events on the window.
GlobalEventHandlers.onclick
Called after the ANY mouse button is pressed & released
GlobalEventHandlers.ondblclick
Called when a double click is made with ANY mouse button.
GlobalEventHandlers.onclose
Called after the window is closed
GlobalEventHandlers.oncontextmenu
Called when the RIGHT mouse button is pressed
GlobalEventHandlers.onerror
Called when a resource fails to load OR when an error occurs at runtime. See error event.
GlobalEventHandlers.onfocus
Called after the window receives or regains focus. See focus events.
WindowEventHandlers.onhashchange
An event handler property for hashchange events on the window; called when the part of the URL after the hash mark ("#") changes.
GlobalEventHandlers.oninput
Called when the value of an <input> element changes
GlobalEventHandlers.onkeydown
Called when you begin pressing ANY key. See keydown event.
GlobalEventHandlers.onkeypress
Called when a key (except Shift, Fn, and CapsLock) is in pressed position. See keypress event.
GlobalEventHandlers.onkeyup
Called when you finish releasing ANY key. See keyup event.
WindowEventHandlers.onlanguagechange
An event handler property for languagechange events on the window.
GlobalEventHandlers.onload
Called after all resources and the DOM are fully loaded. WILL NOT get called when the page is loaded from cache, such as with back button.
WindowEventHandlers.onmessage
Is an EventHandler representing the code to be called when the message event is raised.
GlobalEventHandlers.onmousedown
Called when ANY mouse button is pressed.
GlobalEventHandlers.onmousemove
Called continously when the mouse is moved inside the window.
GlobalEventHandlers.onmouseout
Called when the pointer leaves the window.
GlobalEventHandlers.onmouseover
Called when the pointer enters the window
GlobalEventHandlers.onmouseup
Called when ANY mouse button is released
WindowEventHandlers.onoffline
Called when network connection is lost. See offline event.
WindowEventHandlers.ononline
Called when network connection is established. See online event.
WindowEventHandlers.onpagehide
Called when the user navigates away from the page, before the onunload event. See pagehide event.
WindowEventHandlers.onpageshow
Called after all resources and the DOM are fully loaded. See pageshow event.
WindowEventHandlers.onpopstate
Called when a back button is pressed.
GlobalEventHandlers.onreset
Called when a form is reset
GlobalEventHandlers.onresize
Called continuously as you are resizing the window.
GlobalEventHandlers.onscroll
Called when the scroll bar is moved via ANY means. If the resource fully fits in the window, then this event cannot be invoked
GlobalEventHandlers.onwheel
Called when the mouse wheel is rotated around any axis
GlobalEventHandlers.onselect
Called after text in an input field is selected
GlobalEventHandlers.onselectionchange
Is an EventHandler representing the code to be called when the selectionchange event is raised.
WindowEventHandlers.onstorage
Called when there is a change in session storage or local storage. See storage event
GlobalEventHandlers.onsubmit
Called when a form is submitted
WindowEventHandlers.onunhandledrejection
An event handler for unhandled Promise rejection events.
WindowEventHandlers.onunload
Called when the user navigates away from the page.

Constructors

See also the DOM Interfaces.

DOMParser
DOMParser can parse XML or HTML source stored in a string into a DOM DocumentDOMParser is specified in DOM Parsing and Serialization.
Window.GeckoActiveXObject
FIXME: NeedsContents
Image
Used for creating an HTMLImageElement.
Option
Used for creating an HTMLOptionElement
Window.QueryInterface
FIXME: NeedsContents
Window.StaticRange   Read only
Returns a StaticRange() constructor which creates a StaticRange object.
Worker
Used for creating a Web worker
Window.XMLSerializer
FIXME: NeedsContents
Window.XPCNativeWrapper
FIXME: NeedsContents
Window.XPCSafeJSObjectWrapper
FIXME: NeedsContents

Interfaces

See DOM Reference

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support1121 Yes Yes Yes
cancelIdleCallback47 No

55

531

No Yes No
customElements54 No2

593

Yes — 594

No4110.1
getAttention No No No No No No
getAttentionWithCycleCount No No No No No No
getComputedStyle Yes Yes Yes9 Yes Yes
getDefaultComputedStyle No No19 No No No
getSelection Yes Yes Yes9 Yes Yes
globalStorage No ? Yes — 13 ? ? ?
history Yes ? Yes ? ? ?
home No ?1 No Yes No
innerHeight1 Yes

1

4 — 247

993
innerWidth1 Yes

1

4 — 247

993
isSecureContext Yes Yes49 ? ? ?
length Yes ? Yes ? ? ?
localStorage4 Yes3.5810.54
location Yes Yes Yes8 Yes Yes Yes
locationbar Yes ? ? ? ? ?
matchMedia9 Yes61012.15.1
maximize No ? No ? ? ?
menubar Yes ? Yes ? ? ?
minimize No ? No ? ? ?
moveBy Yes ? Yes ? ? ?
moveTo Yes ? Yes ? ? ?
mozAnimationStartTime No No No No No No
mozInnerScreenX No No Yes No No No
mozInnerScreenY No No Yes No No No
mozPaintCount No No No No No No
name Yes ? Yes ? ? ?
navigator Yes ? Yes ? ? ?
onappinstalled ? ? ? ? ? ?
onbeforeinstallprompt ? ? ? ? ? ?
ondevicemotion ? ? ? ? ? ?
ondeviceorientation ? ? ? ? ? ?
open Yes ? Yes ? ? ?
openDialog No ? No ? ? ?
opener Yes ? Yes ? ? ?
orientation No ? No ? ? ?
outerHeight1 Yes1993
outerWidth1 Yes1993
pageXOffset Yes Yes Yes9 Yes Yes
pageYOffset Yes Yes Yes9 Yes Yes
parent Yes ? Yes ? ? ?
performance6 Yes79158
personalbar Yes ? Yes ? ? ?
pkcs11 No ? Yes — 29 ? ? ?
postMessage1 Yes

89

610

Yes — 611

1012

8 — 1013

9.54
print Yes15 ? Yes ? ? ?
prompt Yes15 ? Yes Yes16 ? ?
releaseEvents Yes ? Yes ? ? ?
requestAnimationFrame

24

10 webkit

Yes

2317

11 — 42 moz 18

4 — 11 moz 19

10

15

Yes o

6.1

6 webkit

requestFileSystem13 webkit Yes No No No No
requestIdleCallback47 No

5520

53 — 5521

No34 No
resizeBy Yes ? Yes22 ? ? ?
resizeTo Yes ? Yes22 ? ? ?
restore No ? No ? ? ?
returnValue No ? No ? ? ?
routeEvent No ? No ? ? ?
screen Yes ? Yes ? ? ?
screenX Yes Yes Yes23 Yes Yes Yes
screenY Yes Yes Yes23 Yes Yes Yes
scroll Yes ? Yes ? ? ?
scrollbars Yes ? Yes ? ? ?
scrollBy Yes ? Yes ? ? ?
scrollByLines No ? Yes ? ? ?
scrollByPages No ? Yes ? ? ?
scrollMaxX No ? Yes ? ? ?
scrollMaxY No ? Yes ? ? ?
scrollTo Yes ? Yes ? ? ?
scrollX

Yes

Yes24

Yes

Yes24

Yes

Yes24

No

924

Yes

Yes24

Yes

Yes24

scrollY

Yes

Yes25

Yes

Yes25

Yes

Yes25

No

925

Yes

Yes25

Yes

Yes25

self Yes Yes Yes Yes Yes Yes
sessionStorage5 Yes2810.54
setCursor No ? No ? ? ?
setImmediate No Yes No10 No No
setResizable No ? Yes ? ? ?
showModalDialog Yes — 43 No3 — 564 No5.126
sidebar No ? Yes ? ? ?
sizeToContent No ?

Yes

2027

? ? ?
speechSynthesis33 Yes49 No ?7
status Yes ? Yes ? ? ?
statusbar Yes ? Yes ? ? ?
stop Yes ? Yes No ? ?
toolbar Yes ? Yes ? ? ?
top Yes Yes Yes29 Yes Yes Yes
updateCommands No ? Yes ? ? ?
visualViewport60 ? No ?47 ?
window Yes ? Yes ? ? ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes1124 Yes Yes Yes
cancelIdleCallback4747 ?

55

531

? No ?
customElements5454 No2

593

Yes — 594

4110.1 ?
getAttention No No No No No No ?
getAttentionWithCycleCount No No No No No No ?
getComputedStyle Yes Yes Yes Yes Yes Yes ?
getDefaultComputedStyle No No No19 No No ?
getSelection ? ? Yes555375.16 ?
globalStorage No No ? No ? ? ?
history Yes Yes ? Yes ? ? ?
home No No ? ? ? No ?
innerHeight Yes Yes Yes

4

4 — 247

93 ?
innerWidth Yes Yes Yes

4

4 — 247

93 ?
isSecureContext Yes Yes Yes49 ? ? ?
length Yes Yes ? Yes ? ? ?
localStorage Yes Yes Yes Yes113.2 ?
location Yes Yes Yes Yes8 Yes Yes ?
locationbar Yes Yes ? ? ? ? ?
matchMedia ? ? Yes612.15 ?
maximize No No ? No ? ? ?
menubar Yes Yes ? Yes ? ? ?
minimize No No ? No ? ? ?
moveBy Yes Yes ? Yes ? ? ?
moveTo Yes Yes ? Yes ? ? ?
mozAnimationStartTime No No No No No No No
mozInnerScreenX No No No Yes No No No
mozInnerScreenY No No No Yes No No No
mozPaintCount No No No No No No No
name Yes Yes ? Yes ? ? ?
navigator Yes Yes ? Yes ? ? ?
onappinstalled ? ? ? ? ? ? ?
onbeforeinstallprompt ? ? ? ? ? ? ?
ondevicemotion ? ? ? ? ? ? ?
ondeviceorientation ? ? ? ? ? ? ?
open Yes Yes ? Yes ? ? ?
openDialog No No ? No ? ? ?
opener Yes Yes ? Yes ? ? ?
orientation No No ? No ? ? ?
outerHeight Yes Yes Yes493 ?
outerWidth Yes Yes Yes493 ?
pageXOffset ? Yes Yes Yes ? ? ?
pageYOffset ? Yes Yes Yes ? ? ?
parent Yes Yes ? Yes ? ? ?
performance Yes Yes Yes7159 ?
personalbar Yes Yes ? Yes ? ? ?
pkcs11 No No ? Yes — 29 ? ? ?
postMessage Yes Yes Yes

89

610

Yes — 611

Yes Yes14 ?
print Yes Yes ? Yes ? ? ?
prompt Yes Yes ? Yes ? ? ?
releaseEvents Yes Yes ? Yes ? ? ?
requestAnimationFrame Yes

25

18 webkit

Yes

23

14 — 42 moz

15

7.1

6.1 webkit

?
requestFileSystem ? Yes webkit Yes No No No ?
requestIdleCallback4747 No

5520

53 — 5521

? No ?
resizeBy Yes Yes ? Yes ? ? ?
resizeTo Yes Yes ? Yes ? ? ?
restore No No ? No ? ? ?
returnValue No No ? No ? ? ?
routeEvent No No ? No ? ? ?
screen Yes Yes ? Yes ? ? ?
screenX Yes Yes Yes Yes23 Yes Yes ?
screenY Yes Yes Yes Yes23 Yes Yes ?
scroll Yes Yes ? Yes ? ? ?
scrollbars Yes Yes ? Yes ? ? ?
scrollBy Yes Yes ? Yes ? ? ?
scrollByLines No No ? Yes ? ? ?
scrollByPages No No ? Yes ? ? ?
scrollMaxX No No ? Yes ? ? ?
scrollMaxY No No ? Yes ? ? ?
scrollTo Yes Yes ? Yes ? ? ?
scrollX

Yes

Yes24

Yes

Yes24

Yes

Yes24

Yes

Yes24

?

?24

?

?24

?

?24

scrollY

Yes

Yes25

Yes

Yes25

Yes

Yes25

Yes

Yes25

?

?25

?

?25

?

?25

self Yes Yes Yes Yes Yes Yes ?
sessionStorage Yes Yes Yes Yes113.2 ?
setCursor No No ? No ? ? ?
setImmediate No No Yes No No No ?
setResizable No No ? Yes ? ? ?
showModalDialog No No No No No No No
sidebar No No ? Yes ? ? ?
sizeToContent No No ? Yes28 ? ? ?
speechSynthesis ? Yes Yes No No7.1 ?
status Yes Yes ? Yes ? ? ?
statusbar Yes Yes ? Yes ? ? ?
stop Yes Yes ? Yes ? ? ?
toolbar Yes Yes ? Yes ? ? ?
top ? ? Yes ? ? ? ?
updateCommands No No ? Yes ? ? ?
visualViewport6060 ? No47 ? ?
window Yes Yes ? Yes ? ? ?

1. From version 53: this feature is behind the dom.requestIdleCallback.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

2. Under consideration

3. From version 59: this feature is behind the dom.webcomponents.customelements.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

4. Until version 59 (exclusive): this feature is behind the dom.webcomponents.enabled preference (needs to be set to true) and the dom.webcomponents.customelements.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

5. No support for selection events.

6. No support for selection start.

7. This property was buggy and could give a wrong value before page load in certain circumstances, see bug 641188.

8. Firefox has a bug whereby single quotes contained in URLs are escaped when accessed via URL APIs. This has been fixed as of Firefox 57.

9. Supports sending File and FileList objects between windows. This is only allowed if the recipient's principal is contained within the sender's principal for security reasons.

10. The message parameter is serialized using the structured clone algorithm. This means you can pass a broad variety of data objects safely to the destination window without having to serialize them yourself.

11. The message parameter must be a string.

12. IE10 had an important limitation: see this article for details.

13. Support only for <frame> and <iframe>.

14. For security reasons, to work properly on Safari, construct using document.getElementById('your-frame').contentWindow.

15. Starting with Chrome 46.0 this method is blocked inside an <iframe> unless its sandbox attribute has the value allow-modals.

16. This function has no effect in the Modern UI/Metro version of Internet Explorer for Windows 8. It does not display a prompt to the user, and always returns undefined. It is not clear whether this is a bug or intended behavior. Desktop versions of IE do implement this function.

17. Callback parameter is a DOMHighResTimestamp. This means ten microsecond precision and zero time as performace.now().

18. Callback parameter is a DOMTimestamp. This means millisecond precision and zero time as Date.now().

19. Could be called with no input parameters.

20. Enabled by default.

21. Implemented but disabled by default.

22. Since Firefox 7, it's no longer possible for a web site to change the default size of a window in a browser if the window wasn’t created by window.open or contains more than one tab. See here for more details.

23. Before Firefox 28, Gecko was using device pixels instead of CSS pixels; in other words, it was assuming a value of screenPixelsPerCSSPixel of 1 for any device.

24. Supported as pageXOffset.

25. Supported as pageYOffset.

26. See WebKit bug 151885 for possible future removal from Safari.

27. The mimimal size is clamped to prevent the window from being too small for the user to interact with.

28. This method has no effect as a page is always in a tab.

29. Starting in Firefox 6, this property is read only, as defined by the standard.

See also