Web/API/MediaTrackSettings/logicalSurface

The MediaTrackSettings dictionary's logicalSurface property indicates whether or not the display area being captured is a logical surface. Logical surfaces are those which are not necessarily entirely onscreen, or may even be off-screen, such as windows' backing buffers (where only part of the buffer is visible without scrolling the containing window) and offscreen rendering contexts.

Syntax

isLogicalSurface = mediaTrackSettings.logicalSurface;

Value

A Boolean value which is true if the video track in the stream of captured video is taken from a logical display surface.

The most common scenario in which a display surface may be a logical one is if the selected surface contains the entire content area of a window which is too large to display onscreen at once. Since the window that contains the surface has to be scrolled to show the rest of the contents, the surface is a logical one.

A visible display surface (that is, a surface for which logicalSurface returns false) is the portion of a logical display surface which is currently visible onscreen.

For example, a user agent may choose to allow the user to choose whether to share the entire document (a browser with logicalSurface value of true), or just the currently visible portion of the document (where the logicalSurface of the browser surface is false).

Specifications

Specification	Status	Comment
Screen CaptureThe definition of 'MediaTrackSettings.logicalSurface' in that specification.	Working Draft	Initial definition

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
`logicalSurface`	Chrome Full support 71	Edge Full support ≤79	Firefox No support No	IE No support No	Opera Full support Yes	Safari ?	WebView Android Full support 71	Chrome Android Full support 71	Firefox Android No support No	Opera Android ?	Safari iOS ?	Samsung Internet Android Full support 10.0

Legend

Full support: Full support
No support: No support
Compatibility unknown: Compatibility unknown