![]() The loading attribute #Ĭhrome loads images at different priorities depending on where they're located with respect to the device viewport. Browser-level lazymloading also ensures that deferred loading of images still works even if JavaScript is disabled on the client. With lazy loading supported directly by the browser, however, there's no need for an external library. Using scroll, resize, or orientationchange event handlersĮither option can let developers include lazy loading functionality, and many developers have built third-party libraries to provide abstractions that are even easier to use.Previously, there were two ways to defer the loading of off-screen images: At the 90th percentile, sites send over 5 MB of images on desktop and mobile. Why browser-level lazy loading? #Īccording to the HTTP Archive, images are the most requested asset type for most websites and usually take up more bandwidth than any other resource. Browser compatibility #īrowsers that do not support the loading attribute simply ignore it without side effects. 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. Does Lighthouse recognize browser-level lazy loading?īrowser-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:.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 browsers?.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?.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.If you've followed all of the troubleshooting suggestions above and are still having connection problems, you can follow the instructions on the GitHub Debug site to run tests and send a report to GitHub Support. Because GitHub cannot resolve network congestion, you should escalate the problem to your internet service provider. If you're experiencing slow connections at certain times of day but not others, the slow speeds are most likely due to network congestion. GitHub does not throttle bandwidth per user. If you're encountering timeouts with SSH, see " Error: Bad file number." Troubleshooting slow downloads and intermittent slow connections For more information, see " Using SSH over the HTTPS port". If you prefer to use SSH but the port is blocked, you can use an alternative port. For more information, see " Troubleshooting cloning errors." Switching from cloning via SSH to cloning via HTTPS, or vice versa may improve connectivity. If so, temporarily disable the plug-ins or extensions during captcha verification. Ensure your browser does not have plug-ins or extensions that may be interfering with GitHub.To verify access to these domains, visit and ensure the text "Connection successfully made!" is displayed, then visit this captcha test page and ensure you are able to load the captcha. If you're behind a corporate firewall, contact your IT administrator to allow those domains. Ensure your network configuration is not blocking or.For a list of supported browsers, see " Supported browsers." If your browser isn't supported, upgrade your browser or install a supported browser. Ensure JavaScript is enabled on your browser.If you're unable to verify with the captcha: ![]() ![]() If there are rules in place, ask your network administrator to allow traffic to GitHub. If you're having connectivity problems on your company or organization's network, check with your network administrator to find out if the network has rules in place to block certain traffic. For more information, see " About GitHub's IP addresses." Using a company or organization's network Make sure your network is configured to allow GitHub's IP addresses. Most often, connection problems occur because a firewall, proxy server, corporate network, or other network is configured in a way that blocks GitHub. ![]()
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