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PWA Support

As of release 1.20, the Flutter template for web apps includes support
for the core features needed for an installable, offline-capable PWA app.
Flutter-based PWAs can be installed in the same way as any other web-based
PWA; the settings signaling that your Flutter app is a PWA are provided by
manifest.json, which is produced by flutter create in the web directory.

PWA support remains a work in progress,
so please give us feedback if you see something that doesn’t look right.