KeyframeEffect.composite

Experimental: 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';

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
Web Animations Level 2 (Web Animations 2) # dom-keyframeeffect-composite

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`composite`	84	84	80 63-79	No	71	No	84	84	80 63-79	60	No	14.0