Commitdcb50a0

Rich Harris

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Original file line number	Diff line number	Diff line change
`@@ -34,6 +34,8 @@ Then, add a function that runs when the component mounts:`
`34`	`34`	`</script>`
`35`	`35`	```
`36`	`36`
	`37`	+>In a[later exercise](bind-this), we'll learn how to get an element reference without using`document.querySelector`.
	`38`	`+`
`37`	`39`	So far so good — you should see gently undulating colours in the shape of the Svelte logo. But there's one problem — the loop will continue even after the component has been destroyed. To fix that, we need to return a cleanup function from`onMount`:
`38`	`40`
`39`	`41`	```js

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