Re: [w3c/manifest] Add a manifest option for the declaration of the web application running pattern (Issue #1019)

> This sounds like you're after [`launch_handler: { route_to: existing-client }`](https://github.com/WICG/sw-launch/blob/main/launch_handler.md) to reduce the chance of having multiple windows open (does not garantee multiple won't be open though).

@alancutter Thanks for your response.
You understand it right, that's what the proposal means.
Developers should have the option of determining the singleton run pattern for the PWA. This give the PWA more "progressive" capability.
And the browser can provide the strict mode for this feature, PWA has only one instance in any case, whether in a window or in a tab.

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