Menu

Individual skill

srcset

0upvotes

Use when reviewing image assets, markup, and CDN or build transforms related to Use srcset for responsive images. Check encoded size, rendered size, loading strategy, and above-the-fold impact together.

skills/srcset/SKILL.md

Read pinned source

Source commit e8d14d049010e2ce25afcd5e8609dfcbbe63e47e

What was checked

Matches the observed repository HEAD
Yes
Scanner rules are current
Yes
Repository scan complete
No
Skill scan complete
Yes
Observed behavior
Instructions only
Last checked
Nov 9, 2026

These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.

Install this skill

Choose an agent in your Stack or copy a command below. Commands fetch the pinned commit and copy only this skill directory. Existing destinations are refused. Copying a command does not install anything.

An install command is unavailable: current rules, complete repository and skill scans, an eligible behavior level and a permitted license are required.

Repository context

Repository stars (not skill ratings)
74,683
Repository last updated
Oct 31, 2026
License
MIT

Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.

Files and excerpt

File metadata and permitted, redacted excerpts come from the recorded scan. Source links are pinned to that commit.

Browse files
Read excerpt

# Use srcset for responsive images

Without `srcset`, every user—regardless of their device—downloads the same large image. A 1600px hero image served to a 375px mobile display downloads 4x the data needed. The `srcset` attribute lets browsers choose the optimal file automatically, reducing bandwidth by 50-80% for mobile users with no change to visual quality.

## Quick Reference

- Add `srcset` with width descriptors (`400w`, `800w`) to all images wider than ~100px
- Always pair `srcset` width descriptors with a `sizes` attribute—without `sizes` the browser assumes `100vw`
- Use density descriptors (`1x`, `2x`) only for fixed-size images like avatars and icons
- Keep `src` pointing to a fallback size for browsers that don't support `srcset`

## Check

Scan all <img> elements in this codebase. Flag: 1) Any <img> wider than 100px (in CSS or layout) that lacks a srcset attribute. 2) Any <img> with srcset but missing a sizes attribute (necessary for width descriptors). 3) Any <img> using only density descriptors (1x, 2x) where width descriptors (400w, 800w) would be more appropriate. 4) Any srcset that provides only one size (no benefit over plain src). Report each finding with file path and line number.
Back to top