Feat/animation timeline utilities

[codedbydollys10]

Pull Request Description

Adds a new Animation Timeline Utilities submission that demonstrates how multi-stage animation sequences can be applied through a single human-readable class.

The submission introduces timeline-based motion presets that combine multiple animation phases into reusable patterns, reducing the need for custom keyframes and repetitive animation combinations.

Closes #1500
Included timeline presets:

• Timeline Reveal
• Timeline Attention
• Timeline Success
• Timeline Modal
• Timeline Loading

Each preset showcases a complete animation journey rather than a single effect.

---

Type of Change

• ✨ New animation / hover effect
• 🧩 New component
• 📝 Documentation improvement
• 🐛 Bug fix in an existing submission
• Other (describe below)

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Submission Checklist

• All changes are inside submissions/examples/animation-timeline-utilities/
• Includes demo.html
• Includes style.css
• Includes README.md
• No changes to core/
• No changes to components/
• One feature per PR

---

Feature Description

What does this add?

A collection of reusable timeline animation presets that combine multiple motion stages into a single class.

How does a developer use it?

<div class="timeline-reveal">
  Welcome
</div>

<div class="timeline-success">
  Saved Successfully
</div>

<div class="timeline-modal">
  Modal Content
</div>

Why does it fit EaseMotion CSS?

EaseMotion CSS is animation-first and human-readable.

This submission allows developers to describe animation intent instead of manually combining several utilities and custom keyframes.

Benefits include:

• Cleaner HTML
• Advanced motion with minimal code
• Consistent animation language
• Better developer experience
• Strong framework differentiation

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Demo

• Demo added (demo.html works directly in a browser)

The demo showcases all timeline presets with real-world UI examples.

---

Browser Testing

• Chrome
• Firefox
• Edge
• Safari (optional but appreciated)

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Notes for Maintainer

This submission is intended as a concept for higher-level motion abstractions and does not modify any framework source files.

Timeline names, timings, and animation combinations are suggestions and may be standardized during framework integration if accepted.

Submitted under GSSoC'26.

[github-actions]

✅ Submission Validation Passed!

Great job! All required files are present.

📁 Folder: submissions/examples/animation-timeline-utilities

Files found:

• ✅ demo.html
• ✅ style.css
• ✅ README.md

📁 Folder: submissions/examples/motion-presets

Files found:

• ✅ demo.html
• ✅ style.css
• ✅ README.md

📁 Folder: submissions/examples/smart-stack-utilities

Files found:

• ✅ demo.html
• ✅ style.css
• ✅ README.md

🚀 Next Steps:

• The maintainer will review your PR
• Respond to any feedback if requested
• Once approved, your contribution will be merged!

Thank you for contributing to EaseMotion CSS! 🎉