diff --git a/.changeset/old-planets-bow.md b/.changeset/old-planets-bow.md
new file mode 100644
index 000000000000..c10fde017f44
--- /dev/null
+++ b/.changeset/old-planets-bow.md
@@ -0,0 +1,5 @@
+---
+"svelte": patch
+---
+
+fix: allow mixing slots and snippets in custom elements mode
diff --git a/packages/svelte/src/compiler/phases/2-analyze/index.js b/packages/svelte/src/compiler/phases/2-analyze/index.js
index 9429d3f6d265..1bd1903d4473 100644
--- a/packages/svelte/src/compiler/phases/2-analyze/index.js
+++ b/packages/svelte/src/compiler/phases/2-analyze/index.js
@@ -649,7 +649,10 @@ export function analyze_component(root, source, options) {
 		);
 	}
 
-	if (analysis.uses_render_tags && (analysis.uses_slots || analysis.slot_names.size > 0)) {
+	if (
+		analysis.uses_render_tags &&
+		(analysis.uses_slots || (!analysis.custom_element && analysis.slot_names.size > 0))
+	) {
 		const pos = analysis.slot_names.values().next().value ?? analysis.source.indexOf('$$slot');
 		e.slot_snippet_conflict(pos);
 	}
diff --git a/packages/svelte/src/compiler/phases/types.d.ts b/packages/svelte/src/compiler/phases/types.d.ts
index 96c0f65eb7f4..1f608165573d 100644
--- a/packages/svelte/src/compiler/phases/types.d.ts
+++ b/packages/svelte/src/compiler/phases/types.d.ts
@@ -63,6 +63,10 @@ export interface ComponentAnalysis extends Analysis {
 	event_directive_node: OnDirective | null;
 	/** true if uses event attributes (onclick) on a DOM element */
 	uses_event_attributes: boolean;
+	/**
+	 * Contains the content of `<svelte:options customElement={...} />`,
+	 * or if not present a boolean which corresponds to the compiler option value
+	 */
 	custom_element: boolean | SvelteOptions['customElement'];
 	/** If `true`, should append styles through JavaScript */
 	inject_styles: boolean;
diff --git a/sites/svelte-5-preview/src/routes/docs/content/01-api/03-snippets.md b/sites/svelte-5-preview/src/routes/docs/content/01-api/03-snippets.md
index 516300f2ea56..b3fe34d21a3b 100644
--- a/sites/svelte-5-preview/src/routes/docs/content/01-api/03-snippets.md
+++ b/sites/svelte-5-preview/src/routes/docs/content/01-api/03-snippets.md
@@ -265,3 +265,5 @@ In advanced scenarios, you may need to create a snippet programmatically. For th
 In Svelte 4, content can be passed to components using [slots](https://svelte.dev/docs/special-elements#slot). Snippets are more powerful and flexible, and as such slots are deprecated in Svelte 5.
 
 They continue to work, however, and you can mix and match snippets and slots in your components.
+
+When using custom elements, you should still use `<slot />` like before. In a future version, when Svelte removes its internal version of slots, it will leave those slots as-is, i.e. output a regular DOM tag instead of transforming it.
diff --git a/sites/svelte-5-preview/src/routes/docs/content/02-examples/04-old-vs-new.md b/sites/svelte-5-preview/src/routes/docs/content/02-examples/04-old-vs-new.md
index 9856c8daee0c..7b46d0c3b1cc 100644
--- a/sites/svelte-5-preview/src/routes/docs/content/02-examples/04-old-vs-new.md
+++ b/sites/svelte-5-preview/src/routes/docs/content/02-examples/04-old-vs-new.md
@@ -293,3 +293,5 @@ Combined with event attributes, this reduces the number of concepts to learn —
 
 - [Before](https://svelte-5-preview.vercel.app/#H4sIAAAAAAAACn2PzYrCQBCEX6XpSxTE3GeTgPoYzh5i0sHB-WOmIywh776ZjCgieOsqqvrrnnBQmiKK84S2NYQCD97jDvnPJxHvpJkWHd0YuuRUsQvKcyOtZGW8CwzHkdlZGIIzUOzLLPe5WvxIW5Wvjq0eaWdFp1V3q6fNFuoGWk2BN8UpedQDXwkua7LYzqCJhQ_Or1TJaxGm5MxpfV7ZLGca16tBUY-Cw0jz7vlVjnx97PJ-2MqqonYMCVTLJWoI7q0eSSKUTSLnzjJ-sn_nfxmfF-FdAQAA)
 - [After](https://svelte-5-preview.vercel.app/#H4sIAAAAAAAACo2PzW6DMBCEX2XlVgIkBHcKUdo-RumBwqJYNbZlL5Eqy-9e_9DkkEtv3vHMzn6OrVygZd2HY3LakHXsVWtWM_rRcbBXFIRhtmo3c1R6Oxuu6TTKkfimlSF424mUhNWoDYqmzWOTo8XLKPv2npH94VZyFnz-HlxZwXCCSaChsniPGi5AF4SvZCwqn7rck5VcaySYL1wsBmWpjdKVj58jpWXgopQU1x52H_tz5ylwbGrhK8eFdWR29PUNO1v-Sy7CHe52SQ1N08RqCx4GeE7PsnpAz0Tg_twH2TmsWNDcwcZQuiFcJ7HjyKqEkLMh8Ajx6X8BPkQdmscBAAA=)
+
+> When using custom elements, you should still use `<slot />` like before. In a future version, when Svelte removes its internal version of slots, it will leave those slots as-is, i.e. output a regular DOM tag instead of transforming it.