This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
The composite property of a KeyframeEffectReadOnly or a KeyframeEffect resolves how an element's animation impacts its underlying property values.
Note: For KeyframeEffect, this property is both a getter and a setter. For KeyframeEffectReadOnly, it is read-only.
// 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).
keyframeEffect overrides the underlying value it is combined with: blur(2) replaces blur(3).keyframeEffect is added to the underlying value with which it is combined (aka additive): blur(2) blur(3).blur(5).| Specification | Status | Comment |
|---|---|---|
| Web Animations The definition of 'keyframeEffectReadOnly.composite' in that specification. | Working Draft | Editor's draft. |
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | No support | No support | No support | No support | No support |
| Feature | Android | Android Webview | Chrome for Android | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|---|
| Basic support | ? | ? | ? | ? | ? | ? | ? | ? |
KeyframeEffectReadOnly and KeyframeEffect objects. Only the latter is mutable.
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https://developer.mozilla.org/en-US/docs/Web/API/KeyframeEffectReadOnly/composite