Is there an alternative to declaring a slot name in light DOM?

Is there an alternative to declaring a slot name in light DOM? light slot
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light wand slot machine I want to prevent showing light DOM content while it's waiting to be absorbed into a slot> I've tried many workarounds Here's my use case:  Recessed square step light Aluminium white Supplied with dedicated LED driver IP rating: IP20 Input voltage: 240v AC Built-in LED 3 Years replacement