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Use when reviewing image assets, markup, and CDN or build transforms related to Use AVIF format for modern browsers. Check encoded size, rendered size, loading strategy, and above-the-fold impact together.
Passed 22 of 22 test cases with the skill, and 21 of 22 without it.
1 fixed21 passed either way0 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
This benchmark measured an earlier version of the skill.
A test case the skill fixed. Same model, same prompt, with and without the skill.
We need a checklist step for our frontend pull request reviews regarding asset delivery. What specifically should reviewers check when an author adds new photographic img elements to the codebase?
| Checked | Without skill | With skill |
|---|---|---|
| Instructs reviewers to verify that modern image formats like AVIF are offered with fallback tags | Missed | Passed |
The instructions your model reads when the skill loads.
AVIF provides the best compression available—50% smaller than JPEG and 20% smaller than WebP—dramatically reducing bandwidth and improving load times.
Check if the website supports AVIF format for even better compression than WebP.
Implement AVIF support with proper fallbacks for browsers that don't support it.
Explain how AVIF provides 50% better compression than JPEG with superior quality.
Review image assets, markup, and delivery configuration related to Use AVIF format for modern browsers. 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/rules/images/avif-format
test cases passed, vs 21 / 22 without
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