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What “PWA sub apps” means
A parent PWA can serve as a hub that lists separate web apps—such as tools in a work suite—and offers a way to install each one. The parent and children remain distinct apps, potentially hosted on different origins. The idea is app-store-like distribution from a web dashboard, not a single PWA that automatically turns every page or feature into a separately installed app.
There are two related but different pieces of technology: Chrome’s experimental <install> element, which provides an install control for another-origin web app, and the WICG Sub Apps API draft, which proposes a parent-child relationship and coordinated permission behavior.
What can be done now—and what is still proposed?
| Approach | Status and scope | What the user gets | Important limitation |
|---|---|---|---|
| Ordinary browser PWA installation | Supported in Chromium browsers; Safari offers Add to Dock on macOS Sonoma with Safari 17 or later. MDN’s cited guidance says Firefox does not support manifest-based PWA installation. | The user installs a qualifying app through the browser’s available interface. | A parent page does not thereby gain a general ability to install unrelated, cross-origin apps. |
Chrome’s experimental <install> element |
Chrome for Developers (2026) documents testing behind a flag in Chrome and Edge from version 148, and an origin trial for versions 148–153. | A catalog can provide a distinct browser-controlled install button for each child app, including one on another origin. | It is experimental and requires the appropriate browser/version and testing or trial setup. The documented catalog model is one button per app, not a guaranteed single action to install the entire catalog. |
| WICG Sub Apps API | A draft proposal, not a behavior to assume is shipped. | The proposal describes parent/sub-app relationships, inherited permissions under a sub-apps permission policy, and one prompt when multiple sub-apps are added. |
Those relationships, permission rules, and consolidated prompt are proposal behavior; check current implementation status before relying on them. |
Chrome for Developers describes cross-origin installation through the <install> element as a way to build a catalog where each app has its own control. Its stated origin-trial range is Chrome and Edge versions 148 through 153, using the same trial token in both browsers. Those version and trial details are specific to that 2026 documentation, not a promise of permanent availability.
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Will users see one prompt or many?
With the experimental catalog approach, the documented pattern is one install control per child. The user chooses an app through its control; do not design on the assumption that a single click installs all listed apps or that the Sub Apps draft’s consolidated prompt is already available. The draft describes one prompt when multiple sub-apps are added, but that is a proposed API behavior rather than a dependable cross-browser feature.
What each child app needs
Where browser installation promotion is involved, each child must meet the browser’s normal PWA install requirements. Chromium’s documented requirements include:
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- A web app manifest with a stable identity, preferably an explicit
id. - Icons at both 192px and 512px.
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The experimental <install> proposal allows a manifestid value when the child manifest does not provide an identity. A stable identity helps the browser distinguish the intended app; do not use changing URLs or per-user URLs as a substitute for a stable app identity.
How to add a child-app control with a fallback
Put one control on the catalog page for each child and include fallback content inside it. A normal link gives users a route to the child even when the experimental element is unsupported; it is not itself an install command.
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<install installurl="https://child.example">
<a href="https://child.example">Open Child App</a>
</install>For a child manifest without an explicit id, the proposal also allows a manifestid attribute. Use the actual identity declared for that child rather than inventing one:
<install installurl="https://child.example" manifestid="child-app-id">
<a href="https://child.example">Open Child App</a>
</install>Because this element is experimental, feature-detect it and provide another path for unsupported browsers. A minimal enhancement pattern is:
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if ("HTMLInstallElement" in window) {
// Keep the browser install control available.
} else {
// Show browser-specific installation guidance and the child link.
}Pair the fallback with clear instructions for the browser and platform you support. Browser-provided installation UI and in-page alternatives vary; MDN documents those alternatives. Avoid presenting a child link as though clicking it will install the app automatically.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Do Chrome and Edge share installed apps or data?
No. An app installed in Edge is a separate installed instance from the same app installed in Chrome. Installation status and app data are not shared between those browser installations. A catalog should therefore avoid implying that installing a child in one browser installs it in another or carries its local browser data across.
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Also make the relationship between origins explicit. A parent listing a child does not by itself establish shared authentication, storage, permissions, or data. Design those flows according to the actual origin and service architecture; do not infer that a parent-child label grants cross-origin access. The Sub Apps draft’s proposed permission inheritance is not a replacement for verifying what a target browser implements.
Browser support and rollout decisions
- Chromium: ordinary manifest-based PWA installation is supported; cross-origin catalog installation through
<install>is the experimental path described for Chrome and Edge 148+ testing and the 148–153 origin trial. - Safari on Mac: Safari 17+ on macOS Sonoma supports adding web apps to the Dock. This is a distinct browser experience, not evidence that Safari supports the experimental Chromium element.
- Firefox: MDN’s cited guidance does not list manifest-based PWA installation support. Keep the child web app usable by link and explain the available browser options instead of promising a PWA install.
Before shipping a catalog, check the actual browser versions and implementation status your users have. Keep the Sub Apps API behind an experiment or other explicit capability gate until the target browsers ship the behavior you need. If the catalog must work today across desktop browsers, treat direct links and browser-specific install instructions as essential rather than optional.
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