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Browser support: Document jQuery 4.x browser support #194

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Browser support: Document jQuery 4.x browser support #194

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24 changes: 14 additions & 10 deletions pages/browser-support.md
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### Desktop

* Chrome: (Current - 1) and Current
* Edge: (Current - 1) and Current
* Firefox: (Current - 1) and Current, ESR
* Internet Explorer: 9+
* Edge: (Current - 1) and Current<sup>[1]</sup>, IE mode<sup>[2]</sup>
* Firefox: (Current - 1) and Current, ESR<sup>[3]</sup>
* Internet Explorer: 11<sup>[2]</sup>
* Safari: (Current - 1) and Current
* Opera: Current

### Mobile

* Stock browser on Android 4.0+<sup>[1]</sup>
* Safari on iOS 7+<sup>[1]</sup>

<small>[1]</small>: Workarounds for Android Browser 4.0-4.3, iOS 7 & iOS 10 are present in the code base, but we no longer actively test these versions. iOS 8, iOS 9 as well as iOS 11 & newer versions are tested.
* Chrome on Android: (Current - 1) and Current
* Safari on iOS: (Current - 2), (Current - 1) and Current

Any problem with jQuery in the above browsers should be reported as a bug in jQuery.

<em>(Current - 1) and Current</em> denotes that we support the current stable version of the browser and the version that preceded it. For example, if the current version of a browser is 24.x, we support the 24.x and 23.x versions.
<em>Current</em> denotes that we support the current stable version of the browser, <em>(Current - 1)</em> - that the version that preceded it is supported. For example, if we support <em>(Current - 2), (Current - 1) and Current</em> versions of a particular browser &amp; the current version of a browser is 24.x, we support the 24.x, 23.x and 22.x versions.

If you need to support Edge Legacy, Internet Explorer 9-10, iOS 7+ (and not just 3 latest versions) or Android Browser in Android 4.0+, use [jQuery 3.x](https://code.jquery.com/jquery/#jquery-all-3.x).

If, additionally, you need to support Internet Explorer 6-8, Opera 12.1x or Safari 5.1+, use [jQuery 1.x](https://releases.jquery.com/jquery/#jquery-all-1.x).

<small>[1]</small> Only the Chromium-based Edge is supported, Edge Legacy & the old EdgeHTML-based version – is not.

Firefox ESR (Extended Support Release) is a Firefox version for use by organizations including schools, universities, businesses and others who need extended support for mass deployments. It is based on a regular release of Firefox and synced from the next regular Firefox every few releases - example ESR versions include Firefox 47, 52 & 60. At any given time there are at most two ESR versions available; jQuery supports both of them. See [the Mozilla site](https://www.mozilla.org/en-US/firefox/organizations/) for more information.
<small>[2]</small> We support both the real Internet Explorer 11 and Edge in IE mode, but only in standards mode and in the IE 11 document mode. [Read more about IE mode in Edge](https://learn.microsoft.com/en-us/deployedge/edge-ie-mode).

If you need to support older browsers like Internet Explorer 6-8, Opera 12.1x or Safari 5.1+, download [jQuery 1.12](https://releases.jquery.com/jquery/#jquery-all-1.x) instead.
<small>[3]</small> Firefox ESR (Extended Support Release) is a Firefox version for use by organizations including schools, universities, businesses and others who need extended support for mass deployments. It is based on a regular release of Firefox and synced from the next regular Firefox every few releases - example ESR versions include Firefox 102, 115 &amp; 128. At any given time there are at most two ESR versions available; jQuery supports all of them. See [the Mozilla site for organizations](https://www.mozilla.org/en-US/firefox/organizations/) for more information.

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