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docs: Add extended channel and clarify channel timing
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Marshall Greenblatt committed
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@@ -72,16 +72,20 @@ Detailed Chromium and CEF version information is available in the include/cef\_v
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## Current Release Branches (Supported)
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Support for newer branches begins when they enter the Chromium beta channel. Support for older branches ends when they exit the Chromium stable channel. Every sixth branch (starting with M138) proceeds through the long-term support candidate (LTC) and long-term support (LTS) channels after exiting stable. The LTC/LTS channels continue to receive platform-agnostic security fixes for ~8 additional months (details [here](https://github.com/chromiumembedded/cef/issues/3947)).
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CEF is currently tracking even-numbered Chromium milestone branches (new CEF branch every ~4 weeks, adjusted for holidays). Support for new branches begins when they enter the Chromium beta channel. Support for older branches ends when they exit the Chromium stable channel (after [2 weeks](https://developer.chrome.com/blog/chrome-two-week-release) as stable), unless that branch also qualifies for [extended](https://support.google.com/chrome/a/answer/16942104?hl=en) and/or [LTC/LTS](https://support.google.com/chrome/a/answer/11333726?hl=en) channels.
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* **Stable channel:** Every other Chromium milestone branch starting with M152. These branches receive broad security fixes for ~2 weeks after entering the stable channel.
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* **Extended channel:** Every fourth Chromium milestone branch starting with M152. These branches receive broad security fixes for ~8 weeks total (including time spent in stable).
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* **LTC/LTS channel:** Every 12th Chromium milestone branch starting with M160 (every sixth from M138-M150). These branches receive platform-agnostic security fixes for ~9 months total (including time spent in stable and/or extended).
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The [Spotify automated builder](https://cef-builds.spotifycdn.com/index.html) provides CEF builds for supported branches. Updating CEF branches is currently a manual process so there will likely be a delay between [Chromium release announcements](http://googlechromereleases.blogspot.com/) and the availability of associated CEF builds. See the [Chromium release calendar](https://chromiumdash.appspot.com/schedule) for estimated Chromium release dates and versions.
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| Channel |Release Branch | Version | Branch Date | Last Refresh | Windows Build Requirements | macOS Build Requirements | Linux Build Requirements |
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|:--------|:--------------|:--------|:------------|:--------------|:---------------------------|:----------------------------|:-------------------------|
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| Beta | [8037](https://github.com/chromiumembedded/cef/tree/8037) | 154 | Sep 2026 | Sep 23, 2027 | Win 10+ deployment, Win 10+ build system w/ VS2022 17.13.4, Win 10.0.28000.2270 SDK, Ninja | macOS 12.0+ deployment, 15.6+ build system w/ 26.0 base SDK (Xcode 26.0), Ninja, 64-bit only | Ubuntu 20.04+, Debian 10+, Ninja |
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| Stable | [7977](https://github.com/chromiumembedded/cef/tree/7977) | 152 | Aug 2026 | Sep 8, 2027 | Win 10+ deployment, Win 10+ build system w/ VS2022 17.13.4, Win 10.0.26100.7705 SDK, Ninja | macOS 12.0+ deployment, 15.6+ build system w/ 26.0 base SDK (Xcode 26.0), Ninja, 64-bit only | Ubuntu 20.04+, Debian 10+, Ninja |
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| LTC | [7871](https://github.com/chromiumembedded/cef/tree/7871) | 150 | Jun 2026 | Apr 13, 2027 | Win 10+ deployment, Win 10+ build system w/ VS2022 17.13.4, Win 10.0.26100.7705 SDK, Ninja | macOS 12.0+ deployment, 15.6+ build system w/ 26.0 base SDK (Xcode 26.0), Ninja, 64-bit only | Ubuntu 20.04+, Debian 10+, Ninja |
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| LTS | [7559](https://github.com/chromiumembedded/cef/tree/7559) | 144 | Dec 2025 | Oct 6, 2026 | Win 10+ deployment, Win 10+ build system w/ VS2022 17.13.4, Win 10.0.26100.4654 SDK, Ninja | macOS 12.0+ deployment, 15.6+ build system w/ 26.0 base SDK (Xcode 26.0), Ninja, 64-bit only | Ubuntu 20.04+, Debian 10+, Ninja |
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| Beta | [8037](https://github.com/chromiumembedded/cef/tree/8037) | 154 | Sep 2026 | Oct 5, 2026 | Win 10+ deployment, Win 10+ build system w/ VS2022 17.13.4, Win 10.0.28000.2270 SDK, Ninja | macOS 12.0+ deployment, 15.6+ build system w/ 26.0 base SDK (Xcode 26.0), Ninja, 64-bit only | Ubuntu 20.04+, Debian 10+, Ninja |
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| Extended | [7977](https://github.com/chromiumembedded/cef/tree/7977) | 152 | Aug 2026 | Oct 20, 2026 | Win 10+ deployment, Win 10+ build system w/ VS2022 17.13.4, Win 10.0.26100.7705 SDK, Ninja | macOS 12.0+ deployment, 15.6+ build system w/ 26.0 base SDK (Xcode 26.0), Ninja, 64-bit only | Ubuntu 20.04+, Debian 10+, Ninja |
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| LTC | [7871](https://github.com/chromiumembedded/cef/tree/7871) | 150 | Jun 2026 | Apr 13, 2027 | Win 10+ deployment, Win 10+ build system w/ VS2022 17.13.4, Win 10.0.26100.7705 SDK, Ninja | macOS 12.0+ deployment, 15.6+ build system w/ 26.0 base SDK (Xcode 26.0), Ninja, 64-bit only | Ubuntu 20.04+, Debian 10+, Ninja |
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| LTS | [7559](https://github.com/chromiumembedded/cef/tree/7559) | 144 | Dec 2025 | Oct 6, 2026 | Win 10+ deployment, Win 10+ build system w/ VS2022 17.13.4, Win 10.0.26100.4654 SDK, Ninja | macOS 12.0+ deployment, 15.6+ build system w/ 26.0 base SDK (Xcode 26.0), Ninja, 64-bit only | Ubuntu 20.04+, Debian 10+, Ninja |
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## Legacy Release Branches (Unsupported)
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