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docs: clarify $bindable fallback binding requirement #18477

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docs: clarify $bindable fallback binding requirement #18477

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2 changes: 2 additions & 0 deletions documentation/docs/02-runes/06-$bindable.md
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Expand Up @@ -52,3 +52,5 @@ In this case, you can specify a fallback value for when no prop is passed at all
/// file: FancyInput.svelte
let { value = $bindable('fallback'), ...props } = $props();
```

When a bindable prop has a fallback value, the parent must pass a value other than `undefined` if it uses `bind:`. This avoids ambiguity about which value should apply, since the parent and child should share the same value for a binding.