OS X El Capitan

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! class="ios-lab" | Developer
| class="ios-val" | [[Apple]]
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! class="ios-lab" | Version
| class="ios-val" | 10.11
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! class="ios-lab" | Initial release
| class="ios-val" | September 30, 2015
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! class="ios-lab" | Final release
| class="ios-val" | 10.11.6 (July 2016)
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! class="ios-lab" | Price
| class="ios-val" | Free
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! class="ios-lab" | Preceded by
| class="ios-val" | [[OS X Yosemite]]
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! class="ios-lab" | Succeeded by
| class="ios-val" | [[macOS Sierra]]
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{{macOS Version Navbox}}

OS X El Capitan (version 10.11) is the twelfth release of [[macOS]], shipped on September 30, 2015 — a refinement year named, pointedly, for a rock inside Yosemite. Its additions were quality-of-life (Split View full-screen pairing, a shake-to-find cursor, pinned Safari tabs, natural-language Spotlight) and its foundations consequential: Metal, Apple's low-overhead graphics API, replaced OpenGL at the system's heart, and System Integrity Protection ("rootless") walled system files off even from administrators.

= Features =

Split View; Mission Control refinements; Metal on the Mac; System Integrity Protection; Spotlight natural language and live content; Safari pinned tabs and tab audio muting; Notes overhaul; Photos editing extensions; and a systemwide San Francisco font.

= Legacy =

Metal became the graphics substrate of every Apple platform (and the lever that later eased the Apple-silicon transition), while SIP set the security template — protect the system from everything, including its owner, with an escape hatch — that hardened progressively into today's sealed system volume.
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