medium-300-500ms
Use when building standard animations between 300-500ms - page transitions, significant UI changes, animated illustrations that need clear communication
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/dylantarre/animation-principles --skill medium-300-500ms- 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 medium-300-500ms 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.
Medium Animations (300-500ms)
The 300-500ms range is standard animation territory. Long enough to be watched, short enough to not impede flow. The workhorse duration for meaningful motion.
Disney Principles at Medium Duration
All 12 Principles Applicable
Squash & Stretch: Full expression - visible deformation for bouncing, elastic elements. 15-25% stretch feels natural.
Anticipation: Clear preparation - 80-120ms anticipation before main action. Pull back before push forward.
Staging: Multi-element choreography possible - primary action leads, supporting elements follow.
Straight Ahead/Pose to Pose: Pose to pose recommended - define key positions, let easing handle in-betweens.
Follow Through: Essential - overlapping action where parts settle at different rates.
Slow In/Slow Out: Critical for naturalism - both directions need proper easing.
Arcs: Natural motion paths - elements should travel on curves matching real physics.
Secondary Action: Multiple secondary actions - hair follows head, shadow follows object.
Timing: 18-30 frames at 60fps. Enough frames for nuanced motion.
Exaggeration: Full range available - match to brand personality and context.
Solid Drawing: Complex transforms work - 3D rotations, perspective shifts.
Appeal: Character-defining animations - this is where brand personality lives.
Easing Recommendations
/* Smooth, natural motion */
transition: all 400ms cubic-bezier(0.4, 0, 0.2, 1);
/* Expressive entrance */
transition: all 450ms cubic-bezier(0.16, 1, 0.3, 1);
/* Bouncy, playful */
transition: transform 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
/* Dramatic deceleration */
transition: all 350ms cubic-bezier(0, 0.55, 0.45, 1);
Best Use Cases
- Page/view transitions
- Complex modal sequences
- Animated illustrations
- Data visualization changes
- Onboarding animations
- Feature reveals
- State machine transitions
- Loading completion celebrations
Implementation Pattern
.page-enter {
opacity: 0;
transform: translateX(30px);
}
.page-enter-active {
opacity: 1;
transform: translateX(0);
transition: opacity 350ms ease-out,
transform 400ms cubic-bezier(0.16, 1, 0.3, 1);
}
/* Staggered children */
.list-item {
transition: all 400ms cubic-bezier(0.4, 0, 0.2, 1);
}
.list-item:nth-child(1) { transition-delay: 0ms; }
.list-item:nth-child(2) { transition-delay: 50ms; }
.list-item:nth-child(3) { transition-delay: 100ms; }
Key Insight
Medium duration is where animation becomes storytelling. Users watch, understand, and remember these animations. Invest in polish here - it defines perceived quality.
FAQ
What does the medium-300-500ms skill do?
Use when building standard animations between 300-500ms - page transitions, significant UI changes, animated illustrations that need clear communication
How do I install medium-300-500ms?
Run npx skills add https://github.com/dylantarre/animation-principles --skill medium-300-500ms 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/medium-300-500ms/ (personal) or .claude/skills/medium-300-500ms/ (project).
Which AI agents can use medium-300-500ms?
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 medium-300-500ms 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 medium-300-500ms?
It is published by dylantarre in dylantarre/animation-principles. It has 487 recorded installs.
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