Hi @peterh-capella! I'm Dosu and I’m helping the vueuse team.

useFavicon doesn't support multiple favicons or sizes natively—it only manages a single <link rel="icon"> element and accepts a single URL as a string, not an array. If you use multiple instances, each one updates the same link element, so only the last one takes effect. If you need to provide multiple favicons for different sizes, you'll need to manually manipulate the document head. This would be an enhancement request, as the current implementation doesn't cover this use case.
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