Browsers are not required to support all display modes, but they are required to support the spec-defined fallback chain ( "fullscreen" → "standalone" → "minimal-ui" → "browser"). Web apps can choose how they are displayed by setting a display mode in their manifest as explained above. minimal-ui This mode is similar to standalone, but provides the user a minimal set of UI elements for controlling navigation (such as back and reload). The app runs in its own window, separate from the browser, and hides standard browser UI elements such as the URL bar. standalone Opens the web app to look and feel like a standalone app. Property Use fullscreen Opens the web application without any browser UI and takes up the entirety of the available display area. The display property takes one of the following values:
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Games can even be made to launch full screen. For example, you can hide the address bar and browser user interface elements. You can customize what browser UI is shown when your app is launched. The background_color property is used on the splash screen when the application is first launched on mobile. Think about what the user will want to do once they open your app, and place them there. Your start_url should direct the user straight into your app, rather than a product landing page. The start_url is required and tells the browser where your application should start when it is launched, and prevents the app from starting on whatever page the user was on when they added your app to their home screen. For more information, see Uniquely identifying PWAs with the web app manifest id property. Adding the id property to the manifest removes the dependency on the start_url or the location of the manifest, and makes it possible for them to be updated in the future. The id property allows you to explicitly define the identifier used for your application. To use SVG icons safely, you should always specify a rasterized icon as a fallback for browsers that do not support SVG icons.
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If you'd prefer to scale your own icons, and adjust them for pixel-perfection, provide icons in increments of 48dp.Ĭhromium-based browsers also support SVG icons which can be scaled arbitrarily without looking pixelated and that support advanced features like responsiveness to prefers-color-scheme, with the caveat that the icons do not update live, but remain in the state they were in at install time. If only those two icon sizes are provided, Chrome automatically scales the icons to fit the device. To use maskable icons, sometimes referred to as adaptive icons on Android, you'll also need to add "purpose": "any maskable" to the icon property.įor Chromium, you must provide at least a 192x192 pixel icon, and a 512x512 pixel icon. Each object must include the src, a sizes property, and the type of image. The icons property is an array of image objects. When a user installs your PWA, you can define a set of icons for the browser to use on the home screen, app launcher, task switcher, splash screen, and so on. In consequence, developers should not repeat the application name in the when the app is running in standalone mode. For PWAs running in standalone mode, Chromium prepends the short_name (or, if it's not available, the name) to what is specified in the of the HTML document to prevent disguise attacks where standalone apps might try to be mistaken, for example, for operating system dialogs. This title is displayed in various window-switching surfaces such as alt+ tab, overview mode, and the shelf window list. Operating systems usually expect to have a title for each app window. If both are provided, short_name is used on the user's home screen, launcher, or other places where space may be limited. You must provide at least the short_name or name property. json extensions, which may be easier for developers to understand.Ī typical manifest looks something like this: Key manifest properties # short_name and/or name # The specification suggests the extension should be. The manifest file can have any name, but is commonly named manifest.json and served from the root (your website's top-level directory). Manifest files are supported in most browsers though support for individual members may vary quite a bit. A typical manifest file includes the app name, the icons the app should use, and the URL that should be opened when the app is launched, among other things. The web app manifest is a JSON file that tells the browser about your Progressive Web App and how it should behave when installed on the user's desktop or mobile device.
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