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picture-element

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Use when reviewing image assets, markup, and CDN or build transforms related to Use <picture> with an <img> fallback. Check encoded size, rendered size, loading strategy, and above-the-fold impact together.

skills/picture-element/SKILL.md

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# Use <picture> with an <img> fallback

A `<picture>` without an `<img>` fallback renders nothing in browsers that don't support `<picture>` (IE11) or don't support any of the `<source>` formats. The `<img>` child is also where `alt`, `width`, `height`, `loading`, and `fetchpriority` attributes live—these apply regardless of which source the browser selects.

## Quick Reference

- Every `<picture>` must end with an `<img>` element—it is the required fallback and carries `alt`
- `<source>` elements are evaluated top-to-bottom; the first match wins
- Use `type="image/avif"` and `type="image/webp"` on `<source>` for format selection
- The `<img src>` should point to a JPEG or PNG—the universal fallback for all browsers

## Check

Scan all <picture> elements in this codebase. Verify: 1) Every <picture> has an <img> as its last child (required fallback). 2) The <img> has an alt attribute. 3) The <img> has width and height attributes. 4) <source> elements appear before the <img> child. 5) Each <source> has either a srcset attribute or a media attribute. 6) format-selecting <source> elements have a type attribute (type="image/avif", type="image/webp"). Flag any <picture> missing an <img> child or with <img> not as the last child.
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