This feature is experimental. Please share your experiences so we know what to keep or change.
The target selector for the rendered fragments.
When the given target contains an abstract selector like :main or :layer,
this property describes the specific selector that matched:
let result = await up.render({ target: ':main' })
result.target // result: "[up-main='']"
If any [up-hungry] elements were added to the render pass, they
are not included in result.target.
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