This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The composite property of a KeyframeEffect resolves how an element's animation impacts its underlying property values.


// getting
var compositeEnumeration = keyframeEffect.composite;

// setting
keyframeEffect.composite = 'accumulate';


To understand these values, take the example of a keyframeEffect value of blur(2) working on an underlying property value of  blur(3).

The keyframeEffect overrides the underlying value it is combined with:  blur(2) replaces blur(3).
The keyframeEffect is added to the underlying value with which it is combined (aka additive):  blur(2) blur(3).
The keyframeEffect is accumulated on to the underlying value:  blur(5).


Specification Status Comment
Web Animations
The definition of 'KeyframeEffect.composite' in that specification.
Working Draft Editor's draft.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support ? ?63 ? ? ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support ? ? ?63 ? ? ?

See also

Document Tags and Contributors

Contributors to this page: fscholz, rachelnabors, chrisdavidmills, Nexii
Last updated by: fscholz,