Deliver optimized images for varying device screen sizes using srcset, sizes, and <picture> tag.
Level: Beginner to Advanced
Duration: ~60 Mins Deep-Dive
1. Why Responsive Images Matter
Serving a desktop 4K resolution image (2MB) to a student browsing on a 360px mobile screen over a 3G mobile network causes slow loading and wastes cellular data. Responsive images allow the browser to pick the optimal file size for the user's display density and viewport width.
2. The srcset and sizes Attributes
The srcset attribute provides a list of image candidates with their intrinsic widths (indicated by the w descriptor):
3. The Element for Art Direction
When you want to serve completely different image crops for mobile vs desktop, or provide modern WebP/AVIF formats with JPG fallback, use :
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