accordions-dropdowns
Use when animating accordions, collapsibles, dropdowns, or expand/collapse elements for smooth reveal transitions
- Installs
- 502
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/dylantarre/animation-principles --skill accordions-dropdowns- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads accordions-dropdowns automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Accordion & Dropdown Animation Principles
Apply Disney's 12 principles to expand/collapse elements for smooth, informative reveals.
Principles Applied to Accordions
1. Squash & Stretch
Content can slightly compress as it collapses, stretch as it expands. Trigger header can squash on click feedback.
2. Anticipation
Before expanding, header briefly depresses. Chevron starts rotation before content reveals. Builds expectation.
3. Staging
Expanded section should be clearly visible. Consider dimming other accordion items. Active header stays highlighted.
4. Straight Ahead & Pose to Pose
Define clear states: collapsed, expanding, expanded, collapsing. Pose-to-pose for controlled, reversible animations.
5. Follow Through & Overlapping Action
Container expands first, content fades in 50-100ms later. Chevron rotation can overshoot and settle. Creates depth.
6. Ease In & Ease Out
Expand: ease-out (fast start, smooth finish). Collapse: ease-in (slow start, fast finish). cubic-bezier(0.4, 0, 0.2, 1) works well.
7. Arcs
Chevron rotation should ease through the arc. Content items can enter with slight arc paths rather than straight down.
8. Secondary Action
While content reveals (primary), chevron rotates (secondary), sibling accordions may collapse (tertiary).
9. Timing
- Expand/collapse: 250-350ms
- Chevron rotation: 200-250ms
- Content fade: 150-200ms
- Stagger internal items: 30-50ms
- Click feedback: 50ms
10. Exaggeration
Important reveals can use more dramatic timing. FAQ accordions can have snappier animations. Match content importance.
11. Solid Drawing
Maintain consistent header heights. Content should not jitter during height animation. Use proper height techniques.
12. Appeal
Smooth accordions feel polished. Janky height animations feel broken. Proper expand/collapse is worth the technical investment.
CSS Implementation
.accordion-content {
display: grid;
grid-template-rows: 0fr;
transition: grid-template-rows 300ms ease-out;
}
.accordion-content.open {
grid-template-rows: 1fr;
}
.accordion-inner {
overflow: hidden;
}
.accordion-chevron {
transition: transform 250ms ease-out;
}
.accordion-header[aria-expanded="true"] .accordion-chevron {
transform: rotate(180deg);
}
/* Alternative: animate max-height */
.dropdown-content {
max-height: 0;
overflow: hidden;
transition: max-height 300ms ease-out;
}
.dropdown-content.open {
max-height: 500px; /* larger than content */
}
Key Properties
grid-template-rows: smooth heightmax-height: simpler but less precisetransform: rotate chevronsopacity: content fadeoverflow: hidden during transition
FAQ
What does the accordions-dropdowns skill do?
Use when animating accordions, collapsibles, dropdowns, or expand/collapse elements for smooth reveal transitions
How do I install accordions-dropdowns?
Run npx skills add https://github.com/dylantarre/animation-principles --skill accordions-dropdowns in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/accordions-dropdowns/ (personal) or .claude/skills/accordions-dropdowns/ (project).
Which AI agents can use accordions-dropdowns?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is accordions-dropdowns safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains accordions-dropdowns?
It is published by dylantarre in dylantarre/animation-principles. It has 502 recorded installs.
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