gsap-timeline

Name: gsap-timeline
Author: greensock

bygreensock· 8 skills

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How to install gsap-timeline?

greensock/gsap-skills/gsap-timeline

$npx -y skills add greensock/gsap-skills --skill gsap-timeline

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Run `npx skills use "https://github.com/greensock/gsap-skills" --skill "greensock/gsap-skills/gsap-timeline"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.

Use the whole pack

Use the skills in "https://github.com/greensock/gsap-skills" that are relevant to the current task. Run `npx skills add "https://github.com/greensock/gsap-skills"` and select the relevant skills, then follow their instructions.

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SKILL.md

1	# GSAP Timeline
2
3	## When to Use This Skill
4
5	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.
6
7	Related skills: For single tweens and eases use gsap-core; for scroll-driven timelines use gsap-scrolltrigger; for React use gsap-react.
8
9	## Creating a Timeline
10
11	```javascript
12	const tl = gsap.timeline();
13	tl.to(".a", { x: 100, duration: 1 })
14	.to(".b", { y: 50, duration: 0.5 })
15	.to(".c", { opacity: 0, duration: 0.3 });
16	```
17
18	By default, tweens are appended one after another. Use the position parameter to place tweens at specific times or relative to other tweens.
19
20	## Position Parameter
21
22	Third argument (or position property in vars) controls placement:
23
24	- Absolute: `1` — start at 1 second.
25	- Relative (default): `"+=0.5"` — 0.5s after end; `"-=0.2"` — 0.2s before end.
26	- Label: `"labelName"` — at that label; `"labelName+=0.3"` — 0.3s after label.
27	- Placement: `"<"` — start when recently-added animation starts; `">"` — start when recently-added animation ends (default); `"<0.2"` — 0.2s after recently-added animation start.
28
29	Examples:
30
31	```javascript
32	tl.to(".a", { x: 100 }, 0); // at 0
33	tl.to(".b", { y: 50 }, "+=0.5"); // 0.5s after last end
34	tl.to(".c", { opacity: 0 }, "<"); // same start as previous
35	tl.to(".d", { scale: 2 }, "<0.2"); // 0.2s after previous start
36	```
37
38	## Timeline Defaults
39
40	Pass defaults into the timeline so all child tweens inherit:
41
42	```javascript
43	const tl = gsap.timeline({ defaults: { duration: 0.5, ease: "power2.out" } });
44	tl.to(".a", { x: 100 }).to(".b", { y: 50 }); // both use 0.5s and power2.out
45	```
46
47	## Timeline Options (constructor)
48
49	- paused: true — create paused; call `.play()` to start.
50	- repeat, yoyo — same as tweens; apply to whole timeline.
51	- onComplete, onStart, onUpdate — timeline-level callbacks.
52	- defaults — vars merged into every child tween.
53
54	## Labels
55
56	Add and use labels for readable, maintainable sequencing:
57
58	```javascript
59	tl.addLabel("intro", 0);
60	tl.to(".a", { x: 100 }, "intro");
61	tl.addLabel("outro", "+=0.5");
62	tl.to(".b", { opacity: 0 }, "outro");
63	tl.play("outro"); // start from "outro"
64	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.
65	```
66
67	## Nesting Timelines
68
69	Timelines can contain other timelines.
70
71	```javascript
72	const master = gsap.timeline();
73	const child = gsap.timeline();
74	child.to(".a", { x: 100 }).to(".b", { y: 50 });
75	master.add(child, 0);
76	master.to(".c", { opacity: 0 }, "+=0.2");
77	```
78
79	## Controlling Playback
80
81	- tl.play() / tl.pause()
82	- tl.reverse() / tl.progress(1) then tl.reverse()
83	- tl.restart() — from start.
84	- tl.time(2) — seek to 2 seconds.
85	- tl.progress(0.5) — seek to 50%.
86	- tl.kill() — kill timeline and (by default) its children.
87
88	## Official GSAP Best practices
89
90	- ✅ Prefer timelines for sequencing
91	- ✅ Use the position parameter (third argument) to place tweens at specific times or relative to labels.
92	- ✅ Add labels with `addLabel()` for readable, maintainable sequencing.
93	- ✅ Pass defaults into the timeline constructor so child tweens inherit duration, ease, etc.
94	- ✅ Put ScrollTrigger on the timeline (or top-level tween), not on tweens inside a timeline.
95
96	## Do Not
97
98	- ❌ Chain animations with delay when a timeline can sequence them; prefer `gsap.timeline()` and the position parameter for multi-step animation.
99	- ❌ Forget to pass defaults (e.g. `defaults: { duration: 0.5, ease: "power2.out" }`) when many child tweens share the same duration or ease.
100	- ❌ Forget that duration on the timeline constructor is not the same as tween duration; timeline “duration” is determined by its children.
101	- ❌ Nest animations that contain a ScrollTrigger; ScrollTriggers should only be on top-level Tweens/Timelines.

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Type

Run `npx skills use "https://github.com/greensock/gsap-skills" --skill "greensock/gsap-skills/gsap-timeline"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.

Use the skills in "https://github.com/greensock/gsap-skills" that are relevant to the current task. Run `npx skills add "https://github.com/greensock/gsap-skills"` and select the relevant skills, then follow their instructions.

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