Limited availability
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 left read-only property of the ScreenDetailed interface is a number representing the x-coordinate (left-hand edge) of the total screen area inside the OS virtual screen arrangement, relative to the multi-screen origin.
This is equal to the true left-hand edge, ignoring any OS UI element drawn at the left of the screen. Windows cannot be placed in those areas; to get the left-hand coordinate of the screen area that windows can be placed in, use ScreenDetailed.availLeft.
Note: In Firefox, a non-standard implementation of the left 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.
A number.
Examples Window Management API example// Available in browsers that support the Window Management API
const screenDetails = await window.getScreenDetails();
// Return the absolute left value of the first screen
const screen1Left = screenDetails.screens[0].left;
// Available in Firefox
// Return the absolute left value of the current screen
const screenLeft = window.screen.left;
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