Chrome Update: Google Expands Lazy Loading to Video & Audio

Native lazy loading in Chrome will soon extend to video and audio elements, a move by Google designed to significantly boost browser performance.

By adding the loading="lazy" attribute directly to <video> and <audio> HTML tags now allow developers to defer the download of heavy media resources until the content is near the user’s viewport.

This new feature aligns with the existing lazy-loading behavior for <img> and <iframe> elements, drastically improving initial page load times and reducing unnecessary data consumption.

The Problem with Legacy Media Loading

Historically, embedding multiple videos or audio files on a single webpage caused significant performance bottlenecks.

Browsers loaded heavy resources upfront, slowing page rendering, forcing developers to rely on custom JavaScript workarounds.

They commonly used the Intersection Observer API to calculate when a media element was about to enter the screen, dynamically setting the source attribute only at that exact moment.

This manual approach created several issues:

• It added unnecessary complexity to the codebase and was highly prone to developer error.
• Custom JavaScript routines could not integrate cleanly with the browser’s native preload scanner.
• The heavy scripting overhead occasionally introduced performance vulnerabilities that could impact page stability.

The new Chrome update replaces these complex scripts with a simple declarative API. By using the loading="lazy" attribute, the browser’s native engine takes over the optimization process.

This native implementation allows Chrome to apply network-aware thresholds to determine the optimal moment to fetch media files.

It securely handles complex interactions with existing autoplay and preload attributes. Most importantly, offscreen media files will no longer block the window.onload event.

This ensures the core page content becomes fully interactive much more quickly, providing a smoother user experience and a cleaner code architecture.

Release Timeline and Platform Availability

The feature, tracked internally under the Web feature ID loading-lazy-media within the Blink>Media component, is moving rapidly through Google’s development pipeline.

The web development community has shown strong positive consensus for standardizing this approach.

The deployment schedule is officially mapped out for upcoming Chrome milestones:

• Chrome 147: Developer trials will begin for both Desktop and Android environments.
• Chrome 148: The feature will officially ship and be enabled by default across all major platforms, including Desktop, Android, iOS, and Webview.

By eliminating the need for heavy, custom JavaScript loading scripts, Google is streamlining web development and making websites lighter, faster, and more resilient.

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