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docs: clarify nullish dot-notation components #18463

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8 changes: 8 additions & 0 deletions documentation/docs/03-template-syntax/01-basic-markup.md
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Expand Up @@ -8,6 +8,14 @@ Markup inside a Svelte component can be thought of as HTML++.

A lowercase tag, like `<div>`, denotes a regular HTML element. A capitalised tag or a tag that uses dot notation, such as `<Widget>` or `<my.stuff>`, indicates a _component_.

Dot notation is resolved when the component is rendered. If any part of the expression can be `null` or `undefined`, guard it first:

```svelte
{#if Thing?.Item}
<Thing.Item />
{/if}
```

```svelte
<script>
import Widget from './Widget.svelte';
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