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offscreen-lazy

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Use when reviewing image assets, markup, and CDN or build transforms related to Lazy load offscreen images. Check encoded size, rendered size, loading strategy, and above-the-fold impact together. Missing `loading='lazy'` is only a valid finding when you can reasonably tell the image is offscreen or non-critical.

skills/offscreen-lazy/SKILL.md

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# Lazy load offscreen images

Lazy loading eliminates unnecessary image downloads on initial page load. A page with 20 images below the fold may transfer several megabytes of data that users who don't scroll will never see. Deferring these downloads reduces Time to Interactive, improves LCP for above-fold content, and saves bandwidth—particularly impactful for users on metered mobile connections.

## Quick Reference

- Add `loading="lazy"` to all `<img>` elements below the fold
- Never lazy-load the LCP image (hero, first product image)—use `fetchpriority="high"` instead
- Always pair `loading="lazy"` with `width` and `height` attributes to prevent CLS
- Native `loading="lazy"` has universal support in all modern browsers—no JavaScript polyfill needed
- If fold position is unclear from the snippet, do not invent a lazy-loading defect

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