Lazy Loading Strategies: Eliminating Render-Blocking Assets

IntersectionObserver Lazy Loading Example

// JavaScript IntersectionObserver for Off-Screen Component Initialization
const observer = new IntersectionObserver((entries, obs) => {
  entries.forEach(entry => {
    if (entry.isIntersecting) {
      const container = entry.target;
      loadHeavyWidget(container);
      obs.unobserve(container);
    }
  });
}, { rootMargin: '200px 0px' });

document.querySelectorAll('.lazy-widget').forEach(el => observer.observe(el));