Frontend High-Level Design Implementations

This repository contains practical implementations of various real-world frontend high-level design concepts. Each subdirectory is a standalone demo that illustrates a specific architectural pattern, optimization technique, or design principle used in modern web development by Big Tech companies.

What's Included

px-to-rem-demo

ref ~ Meta - Changing font sizes for better accessibility

A demonstration of how to improve accessibility by automatically converting pixel values to rem units using Webpack and PostCSS. This implementation shows how to:

• Set up a build pipeline using Webpack
• Process CSS with PostCSS plugins
• Convert px units to rem for better scaling
• Implement font size controls that scale the entire UI

three-tier-code-splitting

ref ~ Meta - Code-splitting JavaScript for faster performance

An implementation of a three-tier JavaScript loading approach inspired by Facebook's loading strategy. This demo shows how to:

• Implement a tiered code-splitting strategy for optimized loading
• Organize code into separate tier1 and tier2 directories
• Create custom loading functions for different loading priorities
• Implement skeleton loading screens for both initial HTML and React components
• Demonstrate the difference between critical UI elements (Tier 1) and secondary UI elements (Tier 2)
• Improve key performance metrics like First Paint and Time to Interactive

The implementation includes interactive elements (buttons) that demonstrate how user interactions are prioritized based on their importance.

Purpose

The goal of this repository is to:

1. Demonstrate Practical Implementations - Show working examples of architectural patterns and not just theory
2. Provide Reference Code - Serve as a reference for implementing similar solutions in your own projects
3. Showcase Best Practices - Illustrate modern frontend development approaches with a focus on:
   • Accessibility
   • Performance optimization
   • Maintainable code structure
   • Modern build tooling
   • Progressive enhancement

How to Use This Repository

Each demo is a self-contained project with its own README, dependencies, and build process:

1. Navigate to the demo directory of interest
2. Read the specific README.md for context and instructions
3. Install dependencies with npm install
4. Follow the demo-specific instructions for running or building