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# Guest View
Guest View is a mechanism for embedding a page inside another page. Unlike iframes, the embedded content has a distinct FrameTree. See the [FrameTree explainer](/docs/frame_trees.md) for details.
Guest View is the core implementation of several embedding features implemented
in the //extensions and //chrome layers. Notable examples include:
* The [<webview> tag](https://developer.chrome.com/docs/extensions/reference/webviewTag/), which allows Chrome Apps and WebUI pages to embed content from the web.
* [Controlled Frame](/chrome/common/controlled_frame/README.md), which is
implemented on top of the <webview> tag and is available in isolated
contexts. See https://github.com/WICG/controlled-frame for more information.
* MimeHandlerView, which allows certain MIME types to be loaded by an extension. There is a hard coded list of Mime Handler extensions: Chromium's PDF viewer and [QuickOffice](https://chrome.google.com/webstore/detail/gbkeegbaiigmenfmjfclcdgdpimamgkj).
Guest Views are currently implemented using [inner WebContents](https://docs.google.com/document/d/1q1wY2pISRjricWvJrIGSoKKXeVqytkkKpkjgUwe9dS8/edit?usp=sharing). By end of 2024, we plan to [migrate](https://crbug.com/1261928) Guest Views to use [MPArch](https://docs.google.com/document/d/1NginQ8k0w3znuwTiJ5qjYmBKgZDekvEPC22q0I4swxQ/edit?usp=sharing) like other features which nest FrameTrees.
For debugging <webview>, the [Browser Sample](https://chromewebstore.google.com/detail/edggnmnajhcbhlnpjnogkjpghaikidaa) [[source](https://github.com/GoogleChrome/chrome-extensions-samples/tree/main/_archive/apps/samples/webview-samples/browser)] app serves as a basic demo. To test Chrome Apps on platforms other than ChromeOS:
1. Run `chrome` with `--disable-features=ChromeAppsDeprecation`.
1. On `chrome://extensions/`, enable developer mode and load the app's source as an unpacked extension.
1. Open the app via `chrome://apps/`.
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