mdn · wbamberg · Mar 8, 2023 · Mar 4, 2023 · Mar 4, 2023 · Mar 6, 2023
diff --git a/files/en-us/web/progressive_web_apps/guides/installation/index.md b/files/en-us/web/progressive_web_apps/guides/installation/index.md
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+---
+title: Installation
+slug: Web/Progressive_web_apps/Guides/Installation
+---
+
+One of the defining aspects of a PWA is that it can be installed on the device, and then appears to users as a platform-specific app, a permanent feature of their device which they can launch directly from the platform like any other app.
+
+We can summarize this as follows:
+
+- The PWA can be installed from the platform's app store or installed directly from the web.
+- The PWA can be installed like a platform-specific app, and can customize the install process.
+- Once installed, the PWA gets an app icon on the device, alongside platform-specific apps.
+- Once installed, the PWA can be launched as a standalone app, rather than a website in a browser.
+
+We'll discuss each of these features in this guide. First, though, we'll discuss the requirements that a website must meet for it to be installable.
+
+## Installability
+
+For a website to be installable it needs to meet some technical requirements. We can consider these the minimum requirements for a website to be a PWA.
+
+### The web app manifest
+
+A web app manifest is a JSON file that tells the browser how the PWA should appear and behave on the device. For a website to be a PWA it must be installable, and for it to be installable it must include a manifest.
+
+The manifest is included using a {{HTMLElement("link")}} element in the app's HTML:
+
+```html
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <link rel="manifest" href="manifest.json" />
+    <!-- ... -->
+  </head>
+  <body></body>
+</html>
+```
+
+If the PWA has more than one page, every page must reference the manifest in this way.
+
+The manifest contains a single JSON object containing a collection of keys, each of which defines some aspect of the PWA's appearance or behavior. Here's a rather minimal manifest, containing just two keys: `"name"` and `"icons"`.
+
+```json
+{
+  "name": "My PWA",
+  "icons": [
+    {
+      "src": "icons/512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ]
+}
+```
+
+For a full description of every key, see the [web app manifest reference documentation](/en-US/docs/Web/Manifest).
+
+### Additional installability requirements
+
+As well as a manifest, browsers expect websites to meet additional criteria if they are to be installable.
+
+Chromium-based browsers, including Google Chrome, Samsung Internet, and Microsoft Edge, require that:
+
+- the pages are served over HTTPS
+- the manifest includes the following keys:
+  - [`name`](/en-US/docs/Web/Manifest/name)
+  - [`icons`](/en-US/docs/Web/Manifest/icons)
+  - [`start_url`](/en-US/docs/Web/Manifest/start_url)
+  - [`display`](/en-US/docs/Web/Manifest/display) and/or [`display_override`](/en-US/docs/Web/Manifest/display_override)
+- the website includes a [service worker](/en-US/docs/Web/API/Service_Worker_API) with a [`fetch` event handler](/en-US/docs/Web/API/ServiceWorkerGlobalScope/fetch_event) that provides a basic offline experience.
+
+## Installation from an app store
+
+Users expect to find apps in the app store for their platform, like the Google Play Store or the Apple Store.
+
+If your app meets the installability prerequisites, you can package it and distribute it through app stores. The process is specific to each app store:
+
+- [How to publish a PWA to the Google Play Store](https://chromeos.dev/en/publish/pwa-in-play)
+- [How to publish a PWA to the Microsoft Store](https://learn.microsoft.com/en-us/microsoft-edge/progressive-web-apps-chromium/how-to/microsoft-store)
+- [How to publish a PWA to the Meta Quest Store](https://developer.oculus.com/documentation/web/pwa-submit-app/)
+
+The [PWABuilder](https://docs.pwabuilder.com/#/builder/quick-start) is a tool to simplify the process of packaging and publishing a PWA for various app stores. It supports the Google Play Store, Microsoft Store, Meta Quest Store, and iOS App Store.
+
+If you have added your app to the app store, users can install it from there, just like a platform-specific app.
+
+## Installation from the web
+
+When the user visits a web page that the browser has determined is installable, then the user will be offered the chance to install it. This means you can distribute your PWA as a website, making it discoverable through web search, and also distribute it in app stores, so users can find it there.
+
+This is a great example of the way PWAs can offer you the best of both worlds. It's also a good example of how progressive enhancement works with PWAs: if a user encounters your PWA on the web, using a browser that can't install it, they can use it just like a normal website.
+
+The UI for installing a PWA from the web varies from one browser to another, and from one platform to another. For example, a browser might include an "Install" icon in the URL bar when the user navigates to the page:
+
+![Chrome URL bar, showing PWA install icon](pwa-install.png)
+
+When the user selects the icon, the browser displays a prompt asking if they want to install the PWA, and if they accept, the PWA is installed.
+
+The prompt displays the name and icon for the PWA, taken from the [`name`](/en-US/docs/Web/Manifest/name) and [`icons`](/en-US/docs/Web/Manifest/icons) manifest keys.
+
+### Browser support
+
+Support for installing PWAs from the web varies by browser and by platform.
+
+On desktop:
+
+- Firefox and Safari do not support installing PWAs on any desktop operating systems.
+- Chrome and Edge support installing PWAs on Linux, Windows, macOS, and Chromebooks.
+
+On mobile:
+
+- Firefox, Chrome, Edge, Opera, and Samsung Internet Browser all support installing PWAs on Android.
+- Only Safari is allowed to install PWAs on iOS.
+
+### Triggering the install prompt
+
+A PWA can provide its own UI for the user to open the install prompt, instead of relying on the UI provided by the browser. This enables a PWA to provide some context and a reason for the user to install the PWA.
+
+This technique relies on the [`beforeinstallprompt`](/en-US/docs/Web/API/Window/beforeinstallprompt_event) event, which is fired on the global [`Window`](/en-US/docs/Web/API/Window) object as soon as the browser has determined that the PWA is installable. A PWA can:
+
+- add a UI element for the user to install the PWA (for example, its own "Install" button)
+- listen for the `beforeinstallprompt` event
+- cancel the event's default behavior by calling [`preventDefault()`](/en-US/docs/Web/API/Event/preventDefault)
+- keep a reference to the [`BeforeInstallPromptEvent`](/en-US/docs/Web/API/BeforeInstallPromptEvent), and in the event handler for its own "Install" button, call the [`BeforeInstallPromptEvent.prompt()`](/en-US/docs/Web/API/BeforeInstallPromptEvent/prompt) method. This method will show the browser prompt that asks the user if they want to install the PWA.
+
+For example:
+
+```js
+window.addEventListener("beforeinstallprompt", (event) => {
+  // Don't let the default prompt go.
+  event.preventDefault();
+
+  // Instead, wait for the user to click the install button.
+  installButton.addEventListener("click", () => event.prompt());
+});
+```
+
+The `prompt()` method returns a {{jsxref("Promise")}} that resolves with a string `"accepted"` or `"dismissed"` indicating whether or not the user chose to install the PWA.
+
+### Customizing installation
+
+By default, the install prompt contains the name and icon for the PWA. If you provide values for the [`description`](/en-US/docs/Web/Manifest/description) and [`screenshots`](/en-US/docs/Web/Manifest/screenshots) manifest keys, then, on Android only, these values will be shown in the install prompt, giving the user extra context and motivation to install the PWA.
-By default, the install prompt contains the name and icon for the PWA. If you provide values for the [`description`](/en-US/docs/Web/Manifest/description) and [`screenshots`](/en-US/docs/Web/Manifest/screenshots) manifest keys, then, on Android only, these values will be shown in the install prompt, giving the user extra context and motivation to install the PWA.
+By default, the install prompt contains the name and icon for the PWA. If you provide values for the [`description`](/en-US/docs/Web/Manifest/description) and [`screenshots`](/en-US/docs/Web/Manifest/screenshots) manifest members, then, on Android only, these values will be shown in the install prompt, giving the user extra context and motivation to install the PWA.
-By default, the install prompt contains the name and icon for the PWA. If you provide values for the [`description`](/en-US/docs/Web/Manifest/description) and [`screenshots`](/en-US/docs/Web/Manifest/screenshots) manifest keys, then, on Android only, these values will be shown in the install prompt, giving the user extra context and motivation to install the PWA.
+By default, the install prompt contains the name and icon for the PWA. If you provide values for the [`description`](/en-US/docs/Web/Manifest/description) and [`screenshots`](/en-US/docs/Web/Manifest/screenshots) manifest members, then, on Android only, these values will be shown in the install prompt, giving the user extra context and motivation to install the PWA.
+
+The screenshot below shows what the install prompt for the [pwamp demo](https://github.com/MicrosoftEdge/Demos/tree/main/pwamp) looks like on Google Chrome, running on Android:
+
+![Install prompt for pwamp on Android](pwamp-install-prompt-android.png)
+
+## Launching the app
+
+Once the PWA is installed its icon is shown on the device alongside any other apps that the user has installed, and clicking the icon launches the app.
+
+You can use the [`display`](/en-US/docs/Web/Manifest/display) manifest key to control the _display mode_: that is, how the PWA appears when it is launched. In particular:
+
+- `"standalone"` indicates that the PWA should look and feel like a platform-specific application, with no browser UI elements
+- `"browser"` indicates that the PWA should be opened as a new browser tab or window, just like a normal website.
+
+If the browser does not support a given display mode, `display` will fall back to a supported display mode according to a predefined sequence. The [`display_override`](/en-US/docs/Web/Manifest/display_override) enables you to redefine the fallback sequence.
diff --git a/files/en-us/web/progressive_web_apps/guides/installation/pwa-install.png b/files/en-us/web/progressive_web_apps/guides/installation/pwa-install.png
diff --git a/...s/web/progressive_web_apps/guides/installation/pwamp-install-prompt-android.png b/...s/web/progressive_web_apps/guides/installation/pwamp-install-prompt-android.png