ScreenDetailed: availTop property

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

This is equal to the ScreenDetailed.top property, plus the height of any OS UI element drawn at the top of the screen. Windows cannot be placed in those areas, so availTop is useful for giving you the top boundary of the actual area available to open or place windows.

Note: A non-standard implementation of the availTop property is available on the Screen interface in all browsers. 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 availTop value of the first screen
const screen1AvailTop = screenDetails.screens[0].availTop;

Non-standard example

js
// Available in all browsers
// Return the availTop value of the current screen
const screenAvailTop = window.screen.availTop;

Specifications

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

Browser compatibility

BCD tables only load in the browser

See also