*Summary*: The animation-composition property defines the composite operation used when multiple animations affect the same property simultaneously. We support the similar feature in Web Animations (for script-generated animations) already, and this new CSS property is for CSS Animations. The values of animation-composition <https://drafts.csswg.org/css-animations-2/#propdef-animation-composition> have the meaning defined for the corresponding values of the composite operation <https://drafts.csswg.org/web-animations-1/#composite-operation> defined in Web Animations. There is an example in the spec link if you are interested. *Specification*: https://drafts.csswg.org/css-animations-2/#animation-composition *Platform coverage*: all *Preference*: "layout.css.animation-composition.enabled" *DevTools bug*: https://bugzilla.mozilla.org/show_bug.cgi?id=1778407 *Other browsers*: 1) Blink: doesn't support it. 2) Webkit: supports this already since January, 2022. (https://bugs.webkit.org/show_bug.cgi?id=232086 <https://bugs.webkit.org/show_bug.cgi?id=232086>) but has not shipped yet. *web-platform-tests*: The wpt has been merged since https://bugzilla.mozilla.org/show_bug.cgi?id=1748435, in css/css-animations/ folder.
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