electron/docs/api/structures/desktop-capturer-source.md

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# DesktopCapturerSource Object
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* `id` String - The identifier of a window or screen that can be used as a
`chromeMediaSourceId` constraint when calling
[`navigator.webkitGetUserMedia`]. The format of the identifier will be
`window:XX` or `screen:XX`, where `XX` is a random generated number.
* `name` String - A screen source will be named either `Entire Screen` or
`Screen <index>`, while the name of a window source will match the window
title.
* `thumbnail` [NativeImage](../native-image.md) - A thumbnail image. **Note:**
There is no guarantee that the size of the thumbnail is the same as the
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`thumbnailSize` specified in the `options` passed to
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`desktopCapturer.getSources`. The actual size depends on the scale of the
screen or window.
* `display_id` String - A unique identifier that will correspond to the `id` of
the matching [Display](display.md) returned by the [Screen API](../screen.md).
On some platforms, this is equivalent to the `XX` portion of the `id` field
above and on others it will differ. It will be an empty string if not
available.