CSS Scroll-Timeline Parallax Generator

A professional-grade, browser-based utility designed for frontend developers to generate clean, high-performance CSS code for scroll-driven animations. This tool removes the complexity of manual scroll-timeline syntax by providing an intuitive visual interface for controlling animation triggers and keyframe properties.

Core Features

• Visual Property Editor: Control scroll start/end offsets (e.g., 0% to 100%), transition types (linear, ease, cubic-bezier), and transformation properties (X/Y translate, scale, rotate, opacity).
• Live Preview Environment: A central interactive sandbox that mimics a scrollable webpage, allowing users to verify animations before copying code.
• Syntax Export: Clean, modular CSS generation with optional HTML structure examples.
• No-Dependency Architecture: Pure Vanilla JS implementation for maximum speed and zero overhead.

Technical Implementation

• Framework: Pure HTML5, CSS3, and Vanilla JavaScript. No external build steps or heavy libraries.
• Persistence: Strictly in-memory state management. No usage of localStorage, sessionStorage, or cookies to ensure compatibility with sandboxed iframes.
• Styling: Utilizes a clean, light-mode palette:
  • Background: #F9FAFB
  • Surface/Card: #FFFFFF
  • Border/Divider: #E5E7EB
  • Primary Accent (Buttons/Active): #2563EB
  • Typography: #1F2937 (headings), #4B5563 (body)

UI Layout

1. Header: Descriptive title and brief utility description.
2. Configuration Sidebar (Left): Collapsible input groups for "Timeline Range" and "Animation Properties". Each field includes numeric steppers and range sliders.
3. Preview Canvas (Center): A realistic scrollable viewport container. Uses native scroll-timeline properties so users can interact with the scroll bar to test.
4. Code Output Panel (Bottom): A syntax-highlighted code block with a 'Copy to Clipboard' function and 'Reset' controls.

Design Philosophy

• Micro-interactions: Subtle hover states on buttons and smooth transitions when toggling animation properties.
• Responsive Design: The sidebar stacks below the canvas on mobile devices, ensuring the full tool is usable on tablets and smaller screens.
• Accessibility: High contrast ratio, clear labels, and logical focus order for keyboard navigation.

Developer Directive

• Strict Constraint: Ensure the application logic assumes no persistence. All state must be re-initialized on reload.
• Security: All external links (if any) must use rel="noopener noreferrer".
• Clean Code: Use semantic HTML5 elements (<main>, <section>, <aside>) to ensure SEO-friendly document structure.