Contact emails
[email protected]

Specification
https://www.w3.org/TR/cssom-view-1/#dom-window-screenx


Summary
Chrome on Android accurately reports the browser window's position and size 
using window.screenX, window.screenY, window.outerWidth, and 
window.outerHeight. Previously Chrome incorrectly assumed all browser windows 
on Android start at coordinates (0, 0). This is inaccurate for Android tablets 
using freeform windowing mode, causing websites to always receive 0 when 
querying the window's on-screen position using window.screenX and 
window.screenY (these fields store the coordinates of window's top-left corner 
in global work area coordinate space). Moreover, Chrome on Android incorrectly 
assumed that outer dimensions of the browser window are equal to the inner 
dimensions of the website viewport. Remark: window.screenX and window.screenY 
have aliases, window.screenLeft and window.screenTop.


Blink component
Blink>HTML


Web Feature ID
window


Motivation
Chrome on Android in desktop form factors should be in functional parity with 
Chrome for other desktop operating systems. This includes the ability to report 
valid window position to websites that query window.screenX or window.screenY 
fields (also aliases, window.screenLeft and window.screenTop).


Initial public proposal
No information provided


Search tags
window, position, screen, coordinates, android


TAG review
No information provided


TAG review status
Not applicable


Risks




Interoperability and Compatibility
No information provided

Gecko: No signal

WebKit: No signal

Web developers: No signals

Other signals:


WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that it 
has potentially high risk for Android WebView-based applications?
This should not change any observable behavior of WebView.



Debuggability
No information provided


Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, 
ChromeOS, Android, and Android WebView)?
Yes


Is this feature fully tested by web-platform-tests?
No



Flag name on about://flags
android-use-correct-window-bounds


Finch feature name
AndroidUseCorrectWindowBounds


Rollout plan
Will ship enabled for all users


Requires code in //chrome?
False


Tracking bug
https://g-issues.chromium.org/issues/417632037


Launch bug
https://launch.corp.google.com/launch/4400019


Availability expectation
N/A – Chrome for Android catches up.


Adoption expectation
Already widely adopted – recently 16% of all page loads use window.screenX per 
https://chromestatus.com/metrics/feature/timeline/popularity/2712.


Adoption plan
N/A


Non-OSS dependencies

Does the feature depend on any code or APIs outside the Chromium open source 
repository and its open-source dependencies to function?
Depends on Android providing a public API for apps to learn whereabouts of the 
windows they are in.


Estimated milestones


Shipping on Android 145




Anticipated spec changes

Open questions about a feature may be a source of future web compat or interop 
issues. Please list open issues (eg links to known github issues in the project 
for the feature specification) whose resolution may introduce web 
compat/interop risk (eg, changing to naming or structure of the API in a 
non-backward-compatible way).
No spec changes – Chrome for Android catches up.


Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5164958878531584?gate=6272126285512704


Links to previous Intent discussions
Intent to Prototype: 
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAAz0gKehdm7rOzKSmQZ99L%3DJoYs6XTOip8fbxBhAqB7F6YE7EQ%40mail.gmail.com



This intent message was generated by Chrome Platform Status.

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