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Lazy Loading Videos Can Boost Web Performance, But Browser Support Remains Limited

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Lazy loading is a technique that delays downloading video files until they are close to entering the user's viewport, reducing initial page load time, bandwidth usage, and memory consumption. Developers can implement it using the native HTML 'loading=lazy' attribute on video elements, optionally paired with a poster image to show a preview before playback. Currently, native support is limited to Chromium-based browsers such as Google Chrome, Microsoft Edge, and Opera, while Firefox and Safari do not yet support the feature. As an alternative, developers can use the Intersection Observer API to dynamically load video sources, providing a reliable fallback for unsupported browsers. Best practices also include compressing videos, using modern formats, and measuring performance gains through tools like Lighthouse and Core Web Vitals.

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