Generally speaking, lazy loading of offscreen iframes leads to 2-3% median data savings, 1-2% first contentful paint, and 2% first input delay.
Lazy loading Instagram embeds save about 100 Kilobytes on initial load.On, Google managed to reduce the load time by 10 seconds on mobile devices when it added the lazy attribute to YouTube embeds on the page.Lazy loading of YouTube embeds would save about 500 Kilobytes on the initial page load.Google ran a few tests to determine the effect of the lazy loading of iframes. Browsers that don't support the functionality will ignore the attribute while browsers that support it will handle the loading accordingly.
#Firefox blocking https iframe react code
Webmasters need to use the loading="lazy" attribute for iframes in the code of the site to inform the browser that the content should not be loaded right away. The lazy loading of iframes in Chromium-based web browsers follows the same methodology. When a user scrolls down, content gets loaded while the scroll action takes place. When a page is loaded for the first time, content that is not visible, below the fold, may be lazy loaded. Technically speaking, lazy loading keeps the browser from loading certain content until it is accessed by the user. Mozilla's Firefox web browser supports the lazy loading of images as well. The integration of the feature comes right after Google introduced support for the lazy loading of images in Chromium and Chrome. Google revealed on Jthat Google Chrome and Chromium-based web browsers support the lazy loading of iframe content now.
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