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It would likely be fetched with a high priority in this case anyway, so this combination should not really be needed nor used. Note that an image with loading="lazy" and fetchpriority="high" will still be delayed while it is off-screen, and then fetched with a high priority when it is nearly within the viewport. If you want to increase the fetch priority of an important image (for example the LCP image), then Priority Hints should be used with fetchpriority="high". eager just implies the usual eager queueing browsers use by default. It does not imply that the image is loaded any quicker than another image without the loading="eager" attribute.īrowsers prioritize resources based on various heuristics, and the loading attribute just states when the image resource is queued, not how it is prioritized in that queue. The eager value is simply an instruction to load the image as usual, without delaying the load further if it is off-screen. Relationship between the loading attribute and fetch priority #
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Images that are highly likely to be in-viewport, and in particular LCP images, should not be lazy-loaded. While this is the default, it can be useful to explicitly set this if your tooling automatically adds loading="lazy" if there is no explicit value, or if your linter complains if it is not explicitly set.
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At the 90th percentile, sites send about 4.7 MB of images on desktop and mobile. Why browser-level lazy-loading? #Īccording to HTTPArchive, images are the most requested asset type for most websites and usually take up more bandwidth than any other resource. Browser compatibility #īrowser support: chrome 77, Supported 77 firefox 75, Supported 75 edge 79, Supported 79 safari 15.4, Supported 15.4 Sourceīrowsers that do not support the loading attribute simply ignore it without side-effects.
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In Chrome 76 onwards, you can use the loading attribute to lazy-load images without the need to write custom lazy-loading code or use a separate JavaScript library. All articles Browser-level image lazy-loading for the webīrowser-level support for lazy-loading images is now supported on the web! This video shows a demo of the feature:.Does Lighthouse recognize browser-level lazy-loading?.How are images handled when a web page is printed?.How does browser-level lazy-loading affect advertisements on a web page?.Is lazy-loading for iframes also supported in Chrome?.How do I handle browsers that don't support lazy-loading?.What if I'm already using a third-party library or a script to lazy-load images?.How does the loading attribute work with images that are in the viewport but not immediately visible (for example: behind a carousel, or hidden by CSS for certain screen sizes)?.Is there a downside to lazy-loading images that are within the device viewport?.Can CSS background images take advantage of the loading attribute?.
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Can I change how close an image needs to be before a load is triggered?.Are there plans to automatically lazy-load images in Chrome?.Avoid lazy-loading images that are in the first visible viewport.Images should include dimension attributes.Improved data-savings and distance-from-viewport thresholds.Relationship between the loading attribute and fetch priority.
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