HTTP/2 200
content-type: text/html
x-guploader-uploadid: ABgVH8_xLVJhQ1ovGx3oDWuyfTuAcSbGKcXb1PYxplofkBffhs_PwZielrM97IES4uTVyl-J
cache-control: public, max-age=3600
expires: Sat, 19 Jul 2025 16:40:39 GMT
last-modified: Sat, 19 Jul 2025 00:44:58 GMT
etag: W/"94fd816577e6bf1c9f9d0971fd8c5c91"
x-goog-generation: 1752885898017035
x-goog-metageneration: 1
x-goog-stored-content-encoding: identity
x-goog-stored-content-length: 59257
x-goog-meta-goog-reserved-file-mtime: 1752884728
x-goog-hash: crc32c=ivttfg==, md5=lP2BZXfmvxyfnQlx/YxckQ==
x-goog-storage-class: STANDARD
accept-ranges: none
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
alt-svc: clear
x-content-type-options: nosniff
strict-transport-security: max-age=63072000
content-security-policy: default-src 'self'; script-src 'report-sample' 'self' 'wasm-unsafe-eval' https://www.google-analytics.com/analytics.js https://www.googletagmanager.com/gtag/js assets.codepen.io production-assets.codepen.io https://js.stripe.com 'sha256-EehWlTYp7Bqy57gDeQttaWKp0ukTTEUKGP44h8GVeik=' 'sha256-XNBp89FG76amD8BqrJzyflxOF9PaWPqPqvJfKZPCv7M='; script-src-elem 'report-sample' 'self' 'wasm-unsafe-eval' https://www.google-analytics.com/analytics.js https://www.googletagmanager.com/gtag/js assets.codepen.io production-assets.codepen.io https://js.stripe.com 'sha256-EehWlTYp7Bqy57gDeQttaWKp0ukTTEUKGP44h8GVeik=' 'sha256-XNBp89FG76amD8BqrJzyflxOF9PaWPqPqvJfKZPCv7M='; style-src 'report-sample' 'self' 'unsafe-inline'; object-src 'none'; base-uri 'self'; connect-src 'self' developer.allizom.org bcd.developer.allizom.org bcd.developer.mozilla.org updates.developer.allizom.org updates.developer.mozilla.org https://*.google-analytics.com https://*.analytics.google.com https://*.googletagmanager.com https://incoming.telemetry.mozilla.org https://observatory-api.mdn.allizom.net https://observatory-api.mdn.mozilla.net https://api.github.com/search/issues stats.g.doubleclick.net https://api.stripe.com; font-src 'self'; frame-src 'self' interactive-examples.mdn.mozilla.net interactive-examples.mdn.allizom.net mdn.github.io live-samples.mdn.mozilla.net live-samples.mdn.allizom.net *.mdnplay.dev *.mdnyalp.dev *.play.test.mdn.allizom.net https://v2.scrimba.com https://scrimba.com jsfiddle.net www.youtube-nocookie.com codepen.io survey.alchemer.com https://js.stripe.com; img-src 'self' data: *.githubusercontent.com *.googleusercontent.com *.gravatar.com mozillausercontent.com firefoxusercontent.com profile.stage.mozaws.net profile.accounts.firefox.com developer.mozilla.org mdn.dev interactive-examples.mdn.mozilla.net interactive-examples.mdn.allizom.net wikipedia.org upload.wikimedia.org https://mdn.github.io/shared-assets/ https://mdn.dev/ https://*.google-analytics.com https://*.googletagmanager.com www.gstatic.com; manifest-src 'self'; media-src 'self' archive.org videos.cdn.mozilla.net https://mdn.github.io/shared-assets/; child-src 'self'; worker-src 'self';
x-frame-options: DENY
origin-trial: AxVILwizhbMjxFeHOn1P3R8niO1RJY/smaK4B4d1rLzc1gTaxtXMSaTi+FoigYgCw40uFRDwFcEAeqDR+vVLOW4AAABfeyJvcmlnaW4iOiJodHRwczovL2RldmVsb3Blci5tb3ppbGxhLm9yZyIsImZlYXR1cmUiOiJQcml2YXRlQXR0cmlidXRpb25WMiIsImV4cGlyeSI6MTc0MjA3OTYwMH0=
x-cloud-trace-context: 1c311be8bfd2e9a784e84f6236dbdc78
date: Sat, 19 Jul 2025 15:40:39 GMT
server: Google Frontend
via: 1.1 google
vary: Accept-Encoding
content-encoding: gzip
x-cache: miss
Animation: Animation() constructor - Web APIs | MDN
Animation: Animation() constructor Baseline Widely available
The Animation()
constructor of the Web Animations API returns a new Animation
object instance.
new Animation()
new Animation(effect)
new Animation(effect, timeline)
effect
Optional
The target effect, as an object based on the AnimationEffect
interface, to assign to the animation. Although in the future other effects such as SequenceEffect
s or GroupEffect
s might be possible, the only kind of effect currently available is KeyframeEffect
. This can be null
(which is the default) to indicate that there should be no effect applied.
timeline
Optional
Specifies the timeline
with which to associate the animation, as an object of a type based on the AnimationTimeline
interface. The default value is Document.timeline
, but this can be set to null
as well.
In the Follow the White Rabbit example , the Animation()
constructor is used to create an Animation
for the rabbitDownKeyframes
using the document's timeline
:
const rabbitDownAnimation = new Animation(
rabbitDownKeyframes,
document.timeline,
);