/gsap-timeline

name: gsap-timeline
description: |
  Official GSAP skill for timelines — gsap.timeline(), position parameter, nesting, playback. Use when sequencing animations, choreographing keyframes, or when the user asks about animation sequencing, timelines, or animation order (in GSAP or when recommending a library that supports timelines).
triggers:
  - "gsap timeline"
  - "animation timeline"
  - "sequenced animation"
  - "motion choreography"
license: MIT
od:
  mode: prototype
  category: animation-motion
  upstream: "https://github.com/greensock/gsap-skills"

GSAP Timeline

> Curated from GreenSock's official GSAP skills: https://github.com/greensock/gsap-skills

When to Use This Skill

Apply when building multi-step animations, coordinating several tweens in sequence or parallel, or when the user asks about timelines, sequencing, or keyframe-style animation in GSAP.

**Related skills:** For single tweens and eases use **gsap-core**; for scroll-driven timelines use **gsap-scrolltrigger**; for React use **gsap-react**.

Creating a Timeline

const tl = gsap.timeline();
tl.to(".a", { x: 100, duration: 1 })
  .to(".b", { y: 50, duration: 0.5 })
  .to(".c", { opacity: 0, duration: 0.3 });

By default, tweens are **appended** one after another. Use the **position parameter** to place tweens at specific times or relative to other tweens.

Position Parameter

Third argument (or position property in vars) controls placement:

• **Absolute**: `1` — start at 1 second.
• **Relative (default)**: `"+=0.5"` — 0.5s after end; `"-=0.2"` — 0.2s before end.
• **Label**: `"labelName"` — at that label; `"labelName+=0.3"` — 0.3s after label.
• **Placement**: `"<"` — start when recently-added animation starts; `">"` — start when recently-added animation ends (default); `"<0.2"` — 0.2s after recently-added animation start.

Examples:

tl.to(".a", { x: 100 }, 0);           // at 0
tl.to(".b", { y: 50 }, "+=0.5");      // 0.5s after last end
tl.to(".c", { opacity: 0 }, "<");     // same start as previous
tl.to(".d", { scale: 2 }, "<0.2");    // 0.2s after previous start

Timeline Defaults

Pass defaults into the timeline so all child tweens inherit:

const tl = gsap.timeline({ defaults: { duration: 0.5, ease: "power2.out" } });
tl.to(".a", { x: 100 }).to(".b", { y: 50 }); // both use 0.5s and power2.out

Timeline Options (constructor)

• **paused: true** — create paused; call `.play()` to start.
• **repeat**, **yoyo** — same as tweens; apply to whole timeline.
• **onComplete**, **onStart**, **onUpdate** — timeline-level callbacks.
• **defaults** — vars merged into every child tween.

Labels

Add and use labels for readable, maintainable sequencing:

tl.addLabel("intro", 0);
tl.to(".a", { x: 100 }, "intro");
tl.addLabel("outro", "+=0.5");
tl.to(".b", { opacity: 0 }, "outro");
tl.play("outro");  // start from "outro"
tl.tweenFromTo("intro", "outro"); // pauses the timeline and returns a new Tween that animates the timeline's playhead from intro to outro with no ease.

Nesting Timelines

Timelines can contain other timelines.

const master = gsap.timeline();
const child = gsap.timeline();
child.to(".a", { x: 100 }).to(".b", { y: 50 });
master.add(child, 0);
master.to(".c", { opacity: 0 }, "+=0.2");

Controlling Playback

• **tl.play()** / **tl.pause()**
• **tl.reverse()** / **tl.progress(1)** then **tl.reverse()**
• **tl.restart()** — from start.
• **tl.time(2)** — seek to 2 seconds.
• **tl.progress(0.5)** — seek to 50%.
• **tl.kill()** — kill timeline and (by default) its children.

Official GSAP Best practices

• ✅ Prefer timelines for sequencing
• ✅ Use the **position parameter** (third argument) to place tweens at specific times or relative to labels.
• ✅ Add **labels** with `addLabel()` for readable, maintainable sequencing.
• ✅ Pass **defaults** into the timeline constructor so child tweens inherit duration, ease, etc.
• ✅ Put ScrollTrigger on the timeline (or top-level tween), not on tweens inside a timeline.

Do Not

• ❌ Chain animations with **delay** when a **timeline** can sequence them; prefer `gsap.timeline()` and the position parameter for multi-step animation.
• ❌ Forget to pass **defaults** (e.g. `defaults: { duration: 0.5, ease: "power2.out" }`) when many child tweens share the same duration or ease.
• ❌ Forget that **duration** on the timeline constructor is not the same as tween duration; timeline “duration” is determined by its children.
• ❌ Nest animations that contain a ScrollTrigger; ScrollTriggers should only be on top-level Tweens/Timelines.