Motion & effects / Animation engine
Anime.js
Coordinate custom animation with a programmable timeline.
Understand the resource
What it is.
Anime.js is a JavaScript animation engine with timelines, easings, SVG tools, scroll observation and draggable behavior. It is useful when the motion logic needs more explicit control than a single CSS transition.
When it is useful
Several elements need to animate in a coordinated, interruptible sequence.
A proposed application
Put it to work.
This example illustrates a possible use. The proposed workflow and expected result are separate from the bounded checks recorded below.
Try this
Animate a synthetic process diagram, expose pause behavior, and skip the sequence when reduced motion is requested.
Result to aim for
A maintainable animation sequence with documented states.
Before you start
What you need.
- JavaScript integration and a measured motion/performance budget.
The practical boundaries
What to watch for.
- Animation code can add main-thread work and conflict with framework updates.
- An animation engine does not supply interaction semantics; keyboard access and focus remain application responsibilities.
Review record
What we could establish.
- Public primary documentation and the bounded account-free checks below were reviewed. Anime.js 4.5.0 passed seven local checks covering object and DOM interpolation, sequencing, revert, empty targets and explicit pause. Default animation still ran under reduced motion.
The source-review notes describe documentation and identity. The account-free evaluation below records exactly which public interaction or local fixture was checked, what happened, and what remains untested.
Check current access, terms, licensing and data handling before using a resource with your own material.
Runtime and security evaluation
What the evaluation covers.
Anime.js 4.5.0 passed seven local checks covering object and DOM interpolation, sequencing, revert, empty targets and explicit pause. Default animation still ran under reduced motion.
Methods: Public HTTP response · Public browser sample · Local package fixture · Source review. A completed check covers the stated sample; it is not a safety certification.
- Target
- animejs
- Version or capture
- 4.5.0
- Integrity scope
- sha512-NQimYX+lz8WaXonGS9zVVoviCIAjONeJayxacUditaivYLqyXgGjFKjuyl0aUUhFKm5MriX9ty1TGovNzoJQWA==
Test conditions
- Chromium 155.0.8059.82 on Windows; fresh temporary profile and fresh account-free contexts.
- Public HTTPS GET/HEAD requests only; telemetry/auth routes and WebSockets blocked. No account storage or credential environment variables.
- Synthetic local inputs only. Package/skill source inspected before execution; no install lifecycle scripts run.
- Local package/CSS browser fixtures block real network. Variate additionally uses Node filesystem permissions and a no-network preload.
Individual checks and observations
Public document and DOM
passPublic browser sample: Fresh Chromium GET, then inspect rendered controls after hydration delay
Observed: HTTP 200; 11 captured button labels; 3 inputs; 6 canvases.
Object interpolation
passLocal package fixture: Seek a paused linear numeric animation at0/500/1000ms
Observed: [0, 50, 100]
Object revert
passLocal package fixture: Revert the numeric animation and inspect original value
Observed: {"x": 0}
Timeline sequencing
passLocal package fixture: Schedule two100ms animations and seek to150ms
Observed: {"first": 100, "second": 100}
DOM style interpolation
passLocal package fixture: Seek a synthetic box to50% of transform/opacity animation
Observed: {"transform": "matrix(1, 0, 0, 1, 50, 0)", "opacity": "0.625"}
DOM cleanup
passLocal package fixture: Revert DOM animation and inspect inline properties
Observed: {"opacity": "0.25", "transform": ""}
Empty-target handling
passLocal package fixture: Construct and revert paused animation with an empty target list
Observed: {"accepted": true}
Motion preference and pause
passLocal package fixture: Start synthetic default animation under reduced motion, then explicitly pause
Observed: {"prefersReduced": true, "value": 11, "unchanged": true}
Security findings and boundaries
Passive inspection of the public response headers, requested hosts and the named browser sample. Also inspected pinned source and the specified synthetic fixture outputs. No active exploitation, authenticated permissions test or complete security audit.
Observed · caution
The animation engine does not choose the motion policy
The synthetic animation advanced while prefers-reduced-motion was reduce. Explicit pause stopped it; consumers must connect motion preferences to their own playback decisions.
Observed · info
Inspected package and isolated run
The pinned package declares no runtime dependencies; registry SHA512 matched. The synthetic browser fixture made zero outbound requests. This does not establish all possible package behavior.
Practical caveats
- Use scopes/revert or equivalent lifecycle cleanup, wire reduced motion deliberately, and measure the real page on slower devices.
- Pin and recheck the selected version or sample before adoption; the observations apply only to the scope and date shown.
What remains untested
- No full engine audit, draggable/scroll/WebGL adapter test, framework lifecycle suite or physical-device performance measurement.
- Fresh-browser restrictions can affect external assets and hydration. Initial failed selectors and limited probes remain in the evidence; they are not blanket product failures.
Security limits
- No authenticated workspace, private content, production backend permissions or data-retention verification.
- No full engine audit, draggable/scroll/WebGL adapter test, framework lifecycle suite or physical-device performance measurement.
Evaluation sources
Follow the evidence
Sources and further reading.
Keep exploring