# Gsap Timeline

Official GSAP skill for timelines, gsap.timeline(), position parameter, nesting...

- Repository: https://github.com/calesthio/OpenMontage (74341 stars)
- Category: Design
- License: MIT
- Last updated: 2026-10-28
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add calesthio/OpenMontage --skill gsap-timeline -g -a claude-code -y`
Codex: `npx skills add calesthio/OpenMontage --skill gsap-timeline -g -a codex -y`
Cursor: `npx skills add calesthio/OpenMontage --skill gsap-timeline -g -a cursor -y`
Gemini CLI: `npx skills add calesthio/OpenMontage --skill gsap-timeline -g -a gemini-cli -y`

## 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).

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# GSAP Timeline

## 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

```javascript
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:

```javascript
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:

```javascript
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)

The rest: https://github.com/calesthio/OpenMontage/blob/HEAD/.agents/skills/gsap-timeline/SKILL.md