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Author: Rich-Harris

sites/svelte-5-preview/src/routes/docs/content/01-api/02-runes.md

@@ -170,7 +170,7 @@ Previously, you would have used `beforeUpdate`, which — like `afterUpdate` —
 
 ## `$effect.active`
 
-The `$effect.active` rune is an advanced feature that tells you whether or not the code is running inside an effect or inside your template:
+The `$effect.active` rune is an advanced feature that tells you whether or not the code is running inside an effect or inside your template ([demo](/#H4sIAAAAAAAAE3XP0QrCMAwF0F-JRXAD595rLfgdzodRUyl0bVgzQcb-3VYFQfExl5tDMgvrPCYhT7MI_YBCiiOR2Aq-UxnSDT1jnlOcRlMSlczoiHUXOjYxpOhx5-O12rgAJg4UAwaGhDyR3Gxhjdai4V1v2N2wqus9tC3Y3ifMQjbehaqq4aBhLtEv_Or893icCsdLve-Caj8nBkU67zMO5HtGCfM3sKiWNKhV0zwVaBqd3x3ixVmHFyFLuJyXB-moOe8pAQAA)):
 
 ```svelte
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