pxt-calliope/docs/browsers/technical.md

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# Technical information about browser support
[pxt.microbit.org][] requires that you use a recent version of a modern
browser, such as Microsoft Edge, Google Chrome, Mozilla Firefox, Safari, Opera,
or IE11. This is because the editor uses modern web technologies such as [web
workers][] to enable compiling [TypeScript][] in the browser, or the using the
same [Monaco][] editor that powers [Visual Studio Code][].
[pxt.microbit.org]: https://pxt.microbit.org
[web workers]: http://www.w3.org/TR/workers/
[typescript]: http://www.typescriptlang.org
[monaco]: https://microsoft.github.io/monaco-editor/
[visual studio code]: http://code.visualstudio.com
Most modern browsers automatically update themselves, but in some environments
such as schools these automatic updates are disabled for security. **We
strongly recommend that you use the most recent version of any of these
browsers**, but if you can't then you must use at least:
| Browser | Minimum version | Release date | Windows | Mac |
| ----------------- | --------------- | -------------- | ----------- | ---------- |
| Edge | 12 | March 2015 | Windows 10+ | N/A |
| Internet Explorer | 11 | October 2013 | Windows 7+ | N/A |
| Mozilla Firefox | 31 ESR | July 2014 | Windows XP+ | OS X 10.6+ |
| Google Chrome | 38 | October 2014 | Windows XP+ | OS X 10.6+ |
| Safari | 9 | September 2015 | N/A | OS X 10.9+ |
| Opera | 21 | May 2014 | Windows 7+ | OS X 10.9+ |
Please see our information for which browsers are recommended for [Windows][],
[Mac][], [Linux][], or [Raspberry Pi][].
[Windows]: /browsers/windows
[Mac]: /browsers/mac
[Linux]: /browsers/linux
[Raspberry Pi]: /raspberry-pi