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A component can specify fallbacks for any slots that are left empty, by putting content inside the <slot> element:

<div class="box">
	<slot>
		<em>no content was provided</em>
	</slot>
</div>

We can now create instances of <Box> without any children:

<Box>
	<h2>Hello!</h2>
	<p>This is a box. It can contain anything.</p>
</Box>

<Box/>
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