Cross-browser native lazy loading in JavaScript

The article provides a comprehensive guide on implementing lazy loading in JavaScript websites to optimize loading times, particularly for images and iframes. Lazy loading is a technique that delays loading elements until they are near the user's viewport, enhancing user interaction by loading only visible elements initially. The guide discusses the use of polyfills to ensure compatibility across different browsers, especially older ones that do not natively support the `<img loading=lazy>` attribute. It introduces the loading-attribute-polyfill package, which helps in implementing lazy loading efficiently while also improving SEO by timely loading content for search engine crawlers. The tutorial includes examples for setting up lazy loading for simple images, responsive images, images within a `<picture>` tag, and iframes, emphasizing the importance of specifying dimensions to prevent layout shifts. The article also highlights the potential security concerns with using external services like Polyfill.io, urging developers to review their usage and consider alternatives to maintain application security.

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