How can I tell if a component received slot content?

How can I tell if a component received slot content? element slot Currently, you need a single DOM element to fill a slot This limits slots' usefulness in various scenarios #1037 and #1713 are about elemento slot IO slots are virtualized by dynamically associating element addresses to them as required The association of IEE addresses is accomplished in a way that

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elements slot A set of JavaScript APIs for attaching an encapsulated shadow DOM tree to an element — which is rendered separately from the main document The slot > element is a placeholder for external HTML content, allowing you to inject child elements from other files into your component template