Window

The Window interface 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.

A global variable, window, representing the window in which the script is running, is exposed to JavaScript code.

The Window interface is home to a variety of functions, namespaces, objects, and constructors which are not necessarily directly associated with the concept of a user interface window. However, the Window interface is a suitable place to include these items that need to be globally available. Many of these are documented in the JavaScript Reference and the DOM Reference.

In a tabbed browser, each tab is represented by its own Window object; the global window seen by JavaScript code running within a given tab always represents the tab in which the code is running. That said, even in a tabbed browser, some properties and methods still apply to the overall window that contains the tab, such as resizeTo() and innerHeight. Generally, anything that can't reasonably pertain to a tab pertains to the window instead.

EventTarget Window

Constructors

See also the DOM Interfaces.

DOMParser

DOMParser can parse XML or HTML source stored in a string into a DOM Document. DOMParser is specified in DOM Parsing and Serialization.

HTMLImageElement.Image

Used for creating an HTMLImageElement.

HTMLOptionElement.Option

Used for creating an HTMLOptionElement.

StaticRange Experimental Read only

Returns a StaticRange() constructor which creates a StaticRange object.

Worker

Used for creating a Web worker.

XMLSerializer

Converts a DOM tree into XML or HTML source.

Properties

This interface inherits properties from the EventTarget interface.

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

Window.clientInformation Read only

An alias for Window.navigator.

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.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.devicePixelRatio Read only

Returns the ratio between physical pixels and device independent pixels in the current display.

Window.document Read only

Returns a reference to the document that the window contains.

Window.event Deprecated Read only

Returns the current event, which is the event currently being handled by the JavaScript code's context, or undefined if no event is currently being handled. The Event object passed directly to event handlers should be used instead whenever possible.

Window.external Deprecated Read only

Returns an object with functions for adding external search providers to the browser.

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.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.

isSecureContext Experimental Read only

Returns a boolean indicating whether the current context is secure (true) or not (false).

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 Non-Standard

Returns the message manager object for this window.

Window.mozInnerScreenX Read only Non-Standard

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 Non-Standard

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.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.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.screen Read only

Returns a reference to the screen object associated with the window.

Window.screenX and Window.screenLeft Read only

Both properties return the horizontal distance from the left border of the user's browser viewport to the left side of the screen.

Window.screenY and Window.screenTop Read only

Both properties return the vertical distance from the top border of the user's browser viewport to the top side of the screen.

Window.scrollbars Read only

Returns the scrollbars object, whose visibility can be toggled in the window.

Window.scrollMaxX Non-Standard Read only

The maximum offset that the window can be scrolled to horizontally, that is the document width minus the viewport width.

Window.scrollMaxY Non-Standard 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 Deprecated Non-Standard 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 Deprecated

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

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.

indexedDB Read only

Provides a mechanism for applications to asynchronously access capabilities of indexed databases; returns an IDBFactory object.

origin Read only

Returns the global object's origin, serialized as a string.

Window.scheduler Read only

Returns the Scheduler object associated with the current context. This is the entry point for using the Prioritized Task Scheduling API.

Deprecated properties

Window.content and Window._content Non-Standard Deprecated 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.defaultStatus Deprecated

Gets/sets the status bar text for the given window.

Window.orientation Read only Deprecated

Returns the orientation in degrees (in 90 degree increments) of the viewport relative to the device's natural orientation.

Window.returnValue Deprecated

The return value to be returned to the function that called window.showModalDialog() to display the window as a modal dialog.

Methods

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

Window.alert()

Displays an alert dialog.

Window.blur()

Sets focus away from the window.

Window.cancelAnimationFrame() Experimental

Enables you to cancel a callback previously scheduled with Window.requestAnimationFrame.

Window.cancelIdleCallback() Experimental

Enables you to cancel a callback previously scheduled with Window.requestIdleCallback.

Window.clearImmediate() Non-Standard

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.dump() Non-Standard

Writes a message to the console.

Window.find() Experimental Non-Standard

Searches for a given string in a window.

Window.focus()

Sets focus on the current window.

Window.getComputedStyle()

Gets computed style for the specified element. Computed style indicates the computed values of all CSS properties of the element.

Window.getDefaultComputedStyle() Non-Standard

Gets default computed style for the specified element, ignoring author stylesheets.

Window.getSelection()

Returns the selection object representing the selected item(s).

Window.matchMedia()

Returns a MediaQueryList object representing the specified media query string.

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.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.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() Experimental

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.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() Non-Standard

Scrolls the document by the given number of lines.

Window.scrollByPages() Non-Standard

Scrolls the current document by the specified number of pages.

Window.scrollTo()

Scrolls to a particular set of coordinates in the document.

Window.setImmediate() Non-Standard

Executes a function after the browser has finished other heavy tasks.

Window.setResizable() Non-Standard

Toggles a user's ability to resize a window.

Window.sizeToContent() Non-Standard

Sizes the window according to its content.

Window.showOpenFilePicker()

Shows a file picker that allows a user to select a file or multiple files.

Window.showSaveFilePicker()

Shows a file picker that allows a user to save a file.

Window.showDirectoryPicker()

Displays a directory picker which allows the user to select a directory.

Window.stop()

This method stops window loading.

Window.updateCommands() Non-Standard

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.

EventTarget.dispatchEvent()

Used to trigger an event.

atob()

Decodes a string of data which has been encoded using base-64 encoding.

btoa()

Creates a base-64 encoded ASCII string from a string of binary data.

clearInterval()

Cancels the repeated execution set using setInterval().

clearTimeout()

Cancels the delayed execution set using setTimeout().

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.

fetch()

Starts the process of fetching a resource from the network.

EventTarget.removeEventListener()

Removes an event listener from the window.

setInterval()

Schedules a function to execute every time a given number of milliseconds elapses.

setTimeout()

Schedules a function to execute in a given amount of time.

reportError()

Reports an error in a script, emulating an unhandled exception.

Deprecated methods

Window.back() Non-Standard Deprecated

Moves back one in the window history. This method is deprecated; you should instead use window.history.back().

Window.captureEvents() Non-Standard Deprecated

Registers the window to capture all events of the specified type.

Window.forward() Non-Standard Deprecated

Moves the window one document forward in the history. This method is deprecated; you should instead use window.history.forward().

Window.home() Non-Standard Deprecated

Returns the browser to the home page.

Window.openDialog() Non-Standard Deprecated

Opens a new dialog window.

Window.releaseEvents() Non-Standard Deprecated

Releases the window from trapping events of a specific type.

Window.showModalDialog() Non-Standard Deprecated

Displays a modal dialog.

Events

Listen to these events using addEventListener() or by assigning an event listener to the oneventname property of this interface.

error

Fired when a resource failed to load, or can't be used. For example, if a script has an execution error or an image can't be found or is invalid.

languagechange

Fired at the global scope object when the user's preferred language changes.

orientationchange Deprecated

Fired when the orientation of the device has changed.

devicemotion

Fired at a regular interval, indicating the amount of physical force of acceleration the device is receiving and the rate of rotation, if available.

deviceorientation

Fired when fresh data is available from the magnetometer orientation sensor about the current orientation of the device as compared to the Earth coordinate frame.

resize

Fired when the window has been resized.

storage

Fired when a storage area (localStorage or sessionStorage) has been modified in the context of another document.

vrdisplayconnect Deprecated

Fired when a compatible VR device has been connected to the computer.

vrdisplaydisconnect Deprecated

Fired when a compatible VR device has been disconnected from the computer.

vrdisplayactivate Deprecated

Fired when a display is able to be presented to.

vrdisplaydeactivate Deprecated

Fired when a display can no longer be presented to.

vrdisplayblur Deprecated

Fired when presentation to a display has been paused for some reason by the browser, OS, or VR hardware.

vrdisplayfocus Deprecated

Fired when presentation to a display has resumed after being blurred.

vrdisplaypresentchange Deprecated

Fired when the presenting state of a VR device changes — i.e. goes from presenting to not presenting, or vice versa.

Animation events

animationcancel

Fired when an animation unexpectedly aborts.

animationend

Fired when an animation has completed normally.

animationiteration

Fired when an animation iteration has completed.

animationstart

Fired when an animation starts.

Clipboard events

copy

Fired when the user initiates a copy action through the browser's user interface. Also available via the oncopy property.

cut

Fired when the user initiates a cut action through the browser's user interface. Also available via the oncut property.

paste

Fired when the user initiates a paste action through the browser's user interface. Also available via the onpaste property.

Connection events

offline

Fired when the browser has lost access to the network and the value of navigator.onLine has switched to false.

online

Fired when the browser has gained access to the network and the value of navigator.onLine has switched to true.

Focus events

blur

Fired when an element has lost focus.

focus

Fired when an element has gained focus.

Gamepad events

gamepadconnected

Fired when the browser detects that a gamepad has been connected or the first time a button/axis of the gamepad is used.

gamepaddisconnected

Fired when the browser detects that a gamepad has been disconnected.

History events

hashchange

Fired when the fragment identifier of the URL has changed (the part of the URL beginning with and following the # symbol).

pagehide

Sent when the browser hides the current document while in the process of switching to displaying in its place a different document from the session's history. This happens, for example, when the user clicks the Back button or when they click the Forward button to move ahead in session history.

pageshow

Sent when the browser makes the document visible due to navigation tasks, including not only when the page is first loaded, but also situations such as the user navigating back to the page after having navigated to another within the same tab.

popstate

Fired when the active history entry changes.

Load & unload events

beforeunload

Fired when the window, the document and its resources are about to be unloaded.

DOMContentLoaded

Fired when the document has been completely loaded and parsed, without waiting for stylesheets, images, and subframes to finish loading.

load

Fired when the whole page has loaded, including all dependent resources such as stylesheets images.

unload

Fired when the document or a child resource is being unloaded.

Manifest events

appinstalled

Fired when the browser has successfully installed a page as an application.

beforeinstallprompt

Fired when a user is about to be prompted to install a web application.

Messaging events

message

Fired when the window receives a message, for example from a call to Window.postMessage() from another browsing context.

messageerror

Fired when a Window object receives a message that can't be deserialized.

afterprint

Fired after the associated document has started printing or the print preview has been closed.

beforeprint

Fired when the associated document is about to be printed or previewed for printing.

Promise rejection events

rejectionhandled

Sent every time a JavaScript Promise is rejected, regardless of whether or not there is a handler in place to catch the rejection.

unhandledrejection

Sent when a JavaScript Promise is rejected but there is no handler in place to catch the rejection.

Transition events

transitioncancel

Fired when a CSS transition is canceled.

transitionend

Fired when a CSS transition has completed.

transitionrun

Fired when a CSS transition is first created.

transitionstart

Fired when a CSS transition has actually started.

WebVR events

vrdisplayactivate

Fired when a VR display becomes available to be presented to, for example if an HMD has been moved to bring it out of standby, or woken up by being put on. Also available via the onvrdisplayactivate property.

vrdisplayblur

Fired when presentation to a VR display has been paused for some reason by the browser, OS, or VR hardware. Also available via the onvrdisplayblur property.

vrdisplayconnect

Fired when a compatible VR display is connected to the computer. Also available via the onvrdisplayconnect property.

vrdisplaydeactivate

Fired when a VR display can no longer be presented to, for example if an HMD has gone into standby or sleep mode due to a period of inactivity. Also available via the onvrdisplaydeactivate property.

vrdisplaydisconnect

Fired when a compatible VR display is disconnected from the computer. Also available via the onvrdisplaydisconnect property.

vrdisplayfocus

Fired when presentation to a VR display has resumed after being blurred. Also available via the onvrdisplayfocus property.

vrdisplaypresentchange

Fired when the presenting state of a VR display changes — i.e. goes from presenting to not presenting, or vice versa. Also available via the onvrdisplaypresentchange property.

vrdisplaypointerrestricted

Fired when the VR display's pointer input is restricted to consumption via a pointerlocked element. Also available via the onvrdisplaypointerrestricted property.

vrdisplaypointerunrestricted

Fired when the VR display's pointer input is no longer restricted to consumption via a pointerlocked element. Also available via the onvrdisplaypointerunrestricted property.

Interfaces

Specifications

Specification
HTML Standard
# the-window-object

Browser compatibility

BCD tables only load in the browser