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docs: note custom elements on caveat #14934

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Rich-Harris merged 1 commit into from
Jan 7, 2025
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docs: note custom elements on caveat #14934

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1 change: 1 addition & 0 deletions documentation/docs/07-misc/04-custom-elements.md
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Expand Up @@ -125,3 +125,4 @@ Custom elements can be a useful way to package components for consumption in a n
- The deprecated `let:` directive has no effect, because custom elements do not have a way to pass data to the parent component that fills the slot
- Polyfills are required to support older browsers
- You can use Svelte's context feature between regular Svelte components within a custom element, but you can't use them across custom elements. In other words, you can't use `setContext` on a parent custom element and read that with `getContext` in a child custom element.
- Don't declare properties or attributes starting with `on`, as their usage will be interpreted as an event listener. In other words, Svelte treats `<custom-element oneworld={true}></custom-element>` as `customElement.addEventListener('eworld', true)` (and not as `customElement.oneworld = true`)
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