How do I install the Picture Element skill?

Run npx skillmds@latest add thedaviddias/picture-element in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Picture Element safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Picture Element?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Picture Element free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Picture Element?

thedaviddias (@thedaviddias) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Picture Element by thedaviddias — Agent Skill

Name: Picture Element
Author: thedaviddias

File contents

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

Fix

For each element with issues: 1) If missing : add as the last child. 2) If is not last: move it to after all elements. 3) If elements lack type attributes for format selection: add type="image/avif" or type="image/webp". 4) Verify the points to a universally supported format (JPEG or PNG) as the ultimate fallback. Show the corrected markup.

Explain

Explain how the element works. Browsers evaluate elements in document order and use the first one whose conditions match (type, media, srcset). The element is the fallback for browsers that don't support (IE11) or don't support the source format. Without an child, is invalid HTML and produces no output. The alt attribute must be on the , not the elements—it applies regardless of which source is selected.

Code Review

Review image assets, markup, and delivery configuration related to Use with an fallback. Flag exact files or components where format choice, sizing, or loading behavior violates the rule, and describe how to confirm the fix in DevTools.

For full implementation details, code examples, and framework-specific guidance, see references/rule.md.

Rule page: https://frontendchecklist.io/en/rules/images/picture-element

---name: picture-elementdescription: 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.---# Use <picture> with an <img> fallbackA `<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## CheckScan 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.## FixFor each <picture> element with issues: 1) If missing <img>: add <img src="{fallback-url}" alt="{description}" width="{w}" height="{h}"> as the last child. 2) If <img> is not last: move it to after all <source> elements. 3) If <source> elements lack type attributes for format selection: add type="image/avif" or type="image/webp". 4) Verify the <img src> points to a universally supported format (JPEG or PNG) as the ultimate fallback. Show the corrected <picture> markup.## ExplainExplain how the <picture> element works. Browsers evaluate <source> elements in document order and use the first one whose conditions match (type, media, srcset). The <img> element is the fallback for browsers that don't support <picture> (IE11) or don't support the source format. Without an <img> child, <picture> is invalid HTML and produces no output. The alt attribute must be on the <img>, not the <source> elements—it applies regardless of which source is selected.## Code ReviewReview image assets, markup, and delivery configuration related to Use <picture> with an <img> fallback. Flag exact files or components where format choice, sizing, or loading behavior violates the rule, and describe how to confirm the fix in DevTools.---For full implementation details, code examples, and framework-specific guidance,see `references/rule.md`.Rule page: https://frontendchecklist.io/en/rules/images/picture-element

Frequently asked questions

Picture Element