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Include warning on polyfill.io sheet; use CF instead #2146

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Jun 27, 2024
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Include warning on polyfill.io sheet; use CF instead #2146

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docs: include warning on polyfillio sheet; use cf
Christopher-Hayes Jun 26, 2024
ee25170
Update polyfill.io.md
rstacruz Jun 27, 2024
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18 changes: 11 additions & 7 deletions polyfill.io.md
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---
title: Polyfill.io
category: JavaScript libraries
updated: 2018-08-20
updated: 2024-06-26
intro: |
[Polyfill.io](https://polyfill.io) is a service that serves JavaScript polyfills.
Polyfill.io is a service that serves JavaScript polyfills.
---

## Usage

### Critical security warning

⚠️ The polyfill.io CDN domain is currently being used in a web supply chain attack and is serving malicious code. **Remove any references to this domain from your codebase immediately**. Use alternative CDN providers like cdnjs.cloudflare.com as shown in the examples below.

### Default usage

```html
<script src="https://cdn.polyfill.io/v2/polyfill.min.js"></script>
<script src="https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js"></script>
```

{: .-wrap}

This is the default script for Polyfill.io.

### References

* [API example](https://polyfill.io/v2/docs/api) _(polyfill.io)_
* [List of features](https://polyfill.io/v2/docs/features) _(polyfill.io)_
* [Cloudflare now serves polyfill.io](https://blog.cloudflare.com/polyfill-io-now-available-on-cdnjs-reduce-your-supply-chain-risk) _(blog.cloudflare.com)_

## Optimized

### For modern browsers

```html
<script>if(!(window.Promise&&[].includes&&Object.assign&&window.Map)){document.write('<script src="https://cdn.polyfill.io/v2/polyfill.min.js"></scr'+'ipt>')}</script>
<script>if(!(window.Promise&&[].includes&&Object.assign&&window.Map)){document.write('<script src="https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js"></scr'+'ipt>')}</script>
```

This only includes polyfill.io when necessary, skipping it for modern browsers for faster load times.

### Extra features

```html
<script>if(!(window.fetch&&window.Promise&&[].includes&&Object.assign&&window.Map)){document.write('<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=default,fetch"></scr'+'ipt>')}</script>
<script>if(!(window.fetch&&window.Promise&&[].includes&&Object.assign&&window.Map)){document.write('<script src="https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js?features=default,fetch"></scr'+'ipt>')}</script>
```

This is the same as the previous, but also adds a polyfill for `window.fetch()`. We add a `window.fetch` check and loads the additional `fetch` feature.
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