What are the best practices for lazy loading in JavaScript frameworks?

What are the best practices for lazy loading in JavaScript frameworks?

Lazy loading is a technique to defer loading non-essential resources until they are needed. Best practices include using the Intersection Observer API, implementing code splitting, and optimizing images.

Can you explain how the Intersection Observer API works?

The Intersection Observer API allows you to asynchronously observe changes in the intersection of a target element with an ancestor element or the viewport. This is useful for triggering lazy loading when an element comes into view.

What are some common pitfalls to avoid when implementing lazy loading?

Common pitfalls include not properly handling fallback content, overusing lazy loading which can lead to poor user experience, and failing to test across different devices and browsers.

How does lazy loading affect SEO?

Lazy loading can improve page load times, which is beneficial for SEO. However, ensure that search engines can still access important content by using proper techniques like preloading or ensuring content is visible in the initial HTML.