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[readme] Remove reference to polyfill.io #432

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[readme] Remove reference to polyfill.io #432

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8 changes: 1 addition & 7 deletions README.md
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Expand Up @@ -286,13 +286,7 @@ One or many URLs to be prerendered.
`quicklink`:

- Includes a very small fallback for [requestIdleCallback](https://developer.mozilla.org/en-US/docs/Web/API/Window/requestIdleCallback)
- Requires `IntersectionObserver` to be supported (see [Can I Use](https://caniuse.com/intersectionobserver)). We recommend conditionally polyfilling this feature with a service like Polyfill.io:

```html
<script src="https://polyfill.io/v3/polyfill.min.js?features=IntersectionObserver"></script>
```

Alternatively, see the [Intersection Observer polyfill](https://github.com/GoogleChromeLabs/intersection-observer).
- Requires `IntersectionObserver` to be supported. This is [supported in all modern browsers](https://caniuse.com/intersectionobserver), however you can use the [Intersection Observer polyfill](https://github.com/GoogleChromeLabs/intersection-observer) to support legacy browsers if needed.

## Recipes

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