ScreenDetailed: top property

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

The top read-only property of the ScreenDetailed interface is a number representing the y-coordinate (top edge) of the total screen area inside the OS virtual screen arrangement, relative to the multi-screen origin.

This is equal to the true top edge, ignoring any OS UI element drawn at the top of the screen. Windows cannot be placed in those areas; to get the top coordinate of the screen area that windows can be placed in, use ScreenDetailed.availTop.

Note: In Firefox, a non-standard implementation of the top property is available on the Screen interface. See the Non-standard example below for usage details, and see the Screen reference page for browser support information relating to the non-standard implementation.

Value

A number.

Examples

Window Management API example

js
// Available in browsers that support the Window Management API
const screenDetails = await window.getScreenDetails();

// Return the absolute top value of the first screen
const screen1Top = screenDetails.screens[0].top;

Non-standard example

js
// Available in Firefox
// Return the absolute top value of the current screen
const screenTop = window.screen.top;

Specifications

Specification
Window Management
# ref-for-dom-screendetailed-top

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
top
Experimental

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.

See also