Web/API/Screen/availLeft

Non-standard This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

Returns the first available pixel available from the left side of the screen.

Syntax

let availLeft = window.screen.availLeft;

Example

let setX = window.screen.width - window.screen.availLeft;
let setY = window.screen.height - window.screen.availTop;
window.moveTo(setX, setY);

Notes

In most cases, this property returns 0.

If you work with two screens this property, evaluated on the right screen, returns the width of the left one in pixels (thereby indicating the X coordinate of the left edge of the screen on the right).

On Windows, this property depends on which screen is set as your primary, returning the X coordinate of the leftmost available pixel relative to the primary screen. That is, the primary screen's left edge always has the X coordinate 0, even if it's not the leftmost screen. If the secondary screen is to the left of the primary screen, it has a negative X coordinate to compensate:

[1] [2] - on left screen availLeft returns 0, on the right screen it returns the width of the left one

[2] [1] - on left screen availLeft returns -width of that screen, on the right screen, it returns 0

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`availLeft` Non-standard'	Chrome Full support Yes	Edge Full support 79	Firefox Full support Yes	IE No support No	Opera Full support Yes	Safari Full support 6	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support Yes	Opera Android Full support Yes	Safari iOS ?	Samsung Internet Android Full support Yes

Legend

Full support: Full support
No support: No support
Compatibility unknown: Compatibility unknown
Non-standard. Expect poor cross-browser support.': Non-standard. Expect poor cross-browser support.

Screen.availLeft by Mozilla Contributors is licensed under CC-BY-SA 2.5.