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Showing content from https://developer.mozilla.org/en-US/docs/Web/CSS/@media/display-mode below:

display-mode - CSS: Cascading Style Sheets

Limited availability

The display-mode CSS media feature can be used to test whether a web app is being displayed in a normal browser tab or in some alternative way, such as a standalone app or fullscreen mode.

For example:

• A progressive web app can set its display mode by setting the display member in its manifest. In this case, the value of display-mode identifies the value that was set (but note that this may not be the same as the value requested in the manifest, since a browser may not support the requested mode).

• Any web app can use the Fullscreen API or the Document Picture-in-Picture API to set the display mode, and in this case the value of display-mode identifies the mode that was set.

The display-mode value applies to the top-level browsing context and any child browsing contexts.

The display-mode feature is specified as a keyword value chosen from the list below.

browser

The application opens in a conventional browser tab or new window, depending on the browser and platform.

fullscreen

All of the available display area is used and no user agent chrome is shown. This can be used to apply CSS only when the app has been put in fullscreen mode by the Fullscreen API or by using the fullscreen value of the display member of the Wep App Manifest.

minimal-ui

The application will look and feel like a standalone application, but will have a minimal set of UI elements for controlling navigation. The elements will vary by browser.

picture-in-picture

This mode allows users to continue consuming specific content while they interact with other sites or applications on their device. The app is displayed in a floating and always-on-top window. This can be used to apply CSS only when the app has been put in Picture-in-Picture mode by the Document Picture-in-Picture API.

standalone

The application will look and feel like a standalone application. This can include the application having a different window, its own icon in the application launcher, etc. In this mode, the user agent will exclude UI elements for controlling navigation, but can include other UI elements such as a status bar.

window-controls-overlay

In this mode, the application looks and feels like a standalone desktop application, and the Window Controls Overlay feature is enabled.

@media all and (display-mode: fullscreen) {
  body {
    margin: 0;
    border: 5px solid black;
  }
}

In this example, we combine the display-mode: picture-in-picture value with the prefers-color-scheme media feature to create light and dark color schemes that are applied based on the user's color scheme preference, only when the app is being shown in Picture-in-Picture mode.

@media (display-mode: picture-in-picture) and (prefers-color-scheme: light) {
  body {
    background: antiquewhite;
  }
}

@media (display-mode: picture-in-picture) and (prefers-color-scheme: dark) {
  body {
    background: #333;
  }

  a {
    color: antiquewhite;
  }
}

See Using the Document Picture-in-Picture API for more information and a full example.

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