Instead of serving a low quality image, a popular effect is to show a blurred image. This example will load an animated grey SVG converted to base64: Blurred image placeholder This example will load a solid grey SVG converted to base64: This approach won't show the actual image but it does suggest to the user that the image is coming and it avoids having that one extra image request. Solid placeholderįor even faster placeholder loading, you could show an inline SVG, optionally with base64 encoding. This placeholder technique means that there's an extra image request during load but it is recommended because the user gets a fast experience, whilst also receiving the most optimally scaled image for their device - the best of both worlds. It also applies an optional aspect-ratio of 6/4, so the placeholder fills the area, preventing cumulative layout shift: The following example will request a 400px width image ?w=400 with 10% quality &q=30. You can also add loading="lazy", to prevent the image from being requested if it is below the fold. The image URL should be scaled and with low quality because it will be displayed so briefly. To use a placeholder, add a src attribute to the image. Better score for Cumulative Layout Shift (if aspect-ratio or width/height applied).Better timing for Largest Contentful Paint.Reduced Total Blocking Time (in combination with Sirv.js async loading).Faster appearance of images above the fold.This technique will also improve your PageSpeed score. Shortly afterwards, once sirv.js has loaded, the data-src image will load in the most optimal dimensions, replacing the placeholder image. The placeholder will be requested via src immediately during page load. Simply add height and width parameters, for example: Ĭonsider adding a placeholder image for the fastest loading experience. To prevent this, you can either add height to the container around your image or you can add height (and width) to your images. If your content jumps during image loading, that is known as CLS (Cumulative Layout Shift). Go to your Profiles page to choose the profile, click Edit and in General Settings enter the path to your image in the "Default image" field.Įxample custom image, shown instead of an empty 404 error: Set a custom error message in your Default profile or set a custom error message to a specific set of images via another profile. You can customize this to serve an image of your choice. If an image is missing, a 404 error is returned. If you do this, apply the attribute data-type="static" so that it bypasses dynamic scaling, to load the asset sooner. Sirv JS can lazy load assets that are not hosted on Sirv. If you'd like your background image to fill the background on mobile, add data-mobile-options="fit: cover" or data-mobile-options="fit: crop". Provide the image URL in the data-bg-src attribute. Create a div with a class of Sirv (note it should not be an img).Ģ. You can also apply responsive scaling and lazy loading to background images:ġ. The example below sets different image quality on desktop and mobile devices: You can set different options for mobile devices with SirvMobileOptions. Instead, you can choose created to disable lazy loading and load the image as soon as sirv.js has calculated the most optimally sized image, like so: Lazy loading is applied by default, when the image becomes visible in the viewport. off - not loaded (you can load the image with the API).visible - lazy load image once it enters the viewport.created - load immediately (as soon as img src has been created).Autostart & lazy loadingĪutostart defines when content starts loading. If both approaches are used, the inline option will take precedence. Inline and script examples are provided below. Options can be applied either inline to an img using data-options or globally to all instances on the page with a script using the variable SirvOptions (or SirvMobileOptions for mobile devices). Load resized image if viewport changes size. Automatically initiate the image viewer ( lazy loading).ĭistance from viewport before loading is triggered.
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