Default Blazor WASM PWA project template causes warning in Chrome 89+ - "Site cannot be installed: Page does not work offline."

Not sure this is really a bug, but it is a problem 😉

After creating a barebones Blazor WASM PWA project and running it in Chrome 89, we get the following warning: Site cannot be installed: Page does not work offline. Starting in Chrome 93, the installability criteria is changing, and this site will not be installable. See https://goo.gle/improved-pwa-offline-detection for more information.

Repro: https://github.com/ChristianWeyer/blazor-wasm-pwa-chrome-repro

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~ dotnet --info .NET SDK (reflecting any global.json): Version: 6.0.100-preview.2.21155.3 Commit: 1a9103db2d

Runtime Environment: OS Name: Mac OS X OS Version: 11.2 OS Platform: Darwin RID: osx.11.0-x64 Base Path: /usr/local/share/dotnet/sdk/6.0.100-preview.2.21155.3/

Host (useful for support): Version: 6.0.0-preview.2.21154.6 Commit: 3eaf1f316b

[javiercn]

@ChristianWeyer thanks for contacting us.

We’ll take a look at this and update the issue accordingly.

[captainsafia]

It looks like Chrome is putting the plans to add these validations on hold.

https://developer.chrome.com/blog/improved-pwa-offline-detection/.

Updated April 14th, 2021: We previously announced plans to update the installability criteria to ensure a PWA actually provides an offline experience. After listening to your feedback, and discovering a number of issues, we have decided to put those plans on hold. We strongly believe providing a valid page when the user is offline is critical to providing a good user experience.

I also tried this on Edge 90.0.818.42 and it works fine.

So I don’t think there’s any work to do here for now.