KeyframeEffect.composite

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.

Syntax

// getting
var compositeEnumeration = keyframeEffect.composite;

// setting
keyframeEffect.composite = 'accumulate';

Value

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

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

Specifications

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

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
compositeChrome ? Edge ? Firefox Full support 63
Disabled
Full support 63
Disabled
Disabled From version 63: this feature is behind the dom.animations-api.compositing.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
IE No support NoOpera No support NoSafari No support NoWebView Android ? Chrome Android ? Firefox Android Full support 63
Disabled
Full support 63
Disabled
Disabled From version 63: this feature is behind the dom.animations-api.compositing.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android No support NoSafari iOS No support NoSamsung Internet Android ?

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
User must explicitly enable this feature.
User must explicitly enable this feature.

See also