Web/API/KeyframeEffect/composite

This is an experimental technologyCheck 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';

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).

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

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`composite`	Chrome ?	Edge ?	Firefox Full support 80 Full support 80 No support 63 — 79 Disabled' Disabled' From version 63 until version 79 (exclusive): 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 No	Opera No support No	Safari No support No	WebView Android ?	Chrome Android ?	Firefox Android No support 63 — 79 Disabled' No support 63 — 79 Disabled' Disabled' From version 63 until version 79 (exclusive): 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 No	Safari iOS No support No	Samsung Internet Android ?

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