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docs: list browser versions that already have native fetch #1485

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32 changes: 27 additions & 5 deletions README.md
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Expand Up @@ -328,16 +328,38 @@ controller.abort()

## Browser Support

This polyfill is intended for older browsers that lack a native `window.fetch`
implementation:

- Chrome
- Firefox
- Safari 6.1+
- Internet Explorer 10+

Note: modern browsers such as Chrome, Firefox, Microsoft Edge, and Safari contain native
implementations of `window.fetch`, therefore the code from this polyfill doesn't
have any effect on those browsers. If you believe you've encountered an error
with how `window.fetch` is implemented in any of these browsers, you should file
an issue with that browser vendor instead of this project.
**Do not use this polyfill if you only target modern browsers.** All currently
maintained browsers ship a native, standards-compliant `fetch`. Including
`whatwg-fetch` in those environments is unnecessary and adds extra bundle size.

Browsers where this polyfill is **not needed** (native `fetch` is available):

| Browser | Minimum version with native `fetch` |
| ------- | ----------------------------------- |
| Chrome | 42+ |
| Firefox | 39+ |
| Edge (Chromium) | All versions |
| Edge (Legacy) | 14+ |
| Safari (macOS) | 10.1+ |
| Safari (iOS) | 10.3+ |
| Opera | 29+ |
| Samsung Internet | 4.0+ |

If your supported browser list only includes the versions above (or newer), do
not install or import this polyfill.

Note: in browsers that already provide native `window.fetch`, code from this
polyfill does not take effect. If you believe you've encountered an error with
how `window.fetch` is implemented in any of those browsers, you should file an
issue with that browser vendor instead of this project.


[fetch specification]: https://fetch.spec.whatwg.org
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