A SvelteKit Next-Gen background image is not too difficult to generate. In this video we clarify
what we are taking about by Next-Gen background images. Then we see how you can use the
vite-imagetools plugin automatically to generate WebP background images for you. These have the advantage of being
smaller than less cutting-edge formats such as JPEG and PNG. The upshot is the page loads faster, users
get a better experience and Google becomes more comfortable with ranking your site higher.
We are talking about an image that you set as the background of a DOM element using CSS. The trickiest part here is not creating the modern format image, but making sure a fallback JPEG is shown in browsers which don't yet support Next-Gen formats.
If you are looking for how to add responsive, Next-Gen images as
picture elements, then you should certainly check out the recent article which covers exactly that.
svelte.config.js — click to expand code.
src/routes/lazyload.svelte — click to expand code.
- How to set up a Progressive Web App (PWA) in SvelteKit,
- About WebP Images ,
- Core Web Vitals ,
- MDN Subresource Integrity Docs
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