Re: [w3c/manifest] Support different shortcut icon requirements/guidelines on different platforms (#795)

The idea behind the `badge` purpose is that it's an icon that can be used in space constraint locations like the address bar and device status bar, where the exact appearance (display size, overlay colour, maybe on top of a circular surface) may not always be well defined, or known at all. In other words, a clear, generic icon that is mendable in regards to colour. I agree that the prose can use refinement.

While I appreciate the goal of being able to precise how everything will be used, because some of these graphics will be handed off to the underlying operating system that isn't always an option across OS versions and flavours (e.g. Android OEMs).

The constraints for jump lists sound very similar to me. Icons might be displayed in greyscale, coloured according to a theme color, or in full colour, but the exact appearance might not always be known. As a concrete example, on Android users are free to install a launcher of their choice that may decide to do something different. Browsers cannot hardcode the configuration of each possible launcher.

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