[nucliweb]

Summary

Step 6, the last of the snippets, of the stable issue codes (#316 to #320): the snippets of Loading about CSS, fonts and images carry a code in every issue, and the code is required from now on.

• 10 snippets get their codes: Content-Visibility, Critical-CSS-Detection, CSS-Media-Queries-Analysis, Find-Above-The-Fold-Lazy-Loaded-Images, Find-Images-With-Lazy-and-Fetchpriority, Find-non-Lazy-Loaded-Images-outside-of-the-viewport, Find-render-blocking-resources, Fonts-Preloaded-Loaded-and-used-above-the-fold, Inline-CSS-Info-and-Size and Webfont-Usage-Analyzer.
• PENDING_ISSUE_CODES is empty and goes away, with its exceptions in the contract and the catalog test: every snippet that returns issues must give each one a code and have its table under Issue codes in snippets/SCHEMA.md.
• target: Content-Visibility names the element by its selector, Fonts-Preloaded-Loaded-and-used-above-the-fold the font, and Webfont-Usage-Analyzer the font file by its URL, or the face when it has none, in load-failed, loaded-unused and redeclared.
• Webfont-Usage-Analyzer built one issue with one of two messages for a loaded face nobody uses; it builds the issue for each situation, loaded-unused or redeclared, so each has its literal code.
• Severity by threshold keeps one code: wide-rules in CSS-Media-Queries-Analysis.
• CONTRIBUTING.md: the rule of the codes next to the other rules of the contract, the table under Issue codes in the entry of SCHEMA.md for a new snippet, and in the checklist of a pull request.

No message changes. The skills, dist/ and llms-full.txt are regenerated. Two findings of the manual run come from before this work and are noted for later: Content-Visibility never raises missing-intrinsic-size in Chrome, which computes contain-intrinsic-size: auto none for content-visibility: auto without a declared size, and Cache-Strategy-Analysis repeats its header issues once per request of the same resource (seen in #320).

Test plan

• The catalog test fails for the 10 snippets once they leave PENDING_ISSUE_CODES, and passes with their codes and tables; with the list gone, every other snippet passes as it is (local).
• E2e (local): loaded-unused with a target, blocking-font-display, redeclared with the URL of the file in target and shadowed in Webfont-Usage-Analyzer; the contract runs every snippet with no exception for issues without a code.
• Lint, check:consistency, check:emoji, CLI unit 329 of 329, CLI e2e 575 of 575, test:skills 179 of 179, test:site 44 of 44, test:extension 66 of 66, test:extension:e2e 77 of 77 (local).
• By hand with the CLI (local): a page with a large blocking stylesheet, inline styles in <body>, a lazy image in the viewport with fetchpriority="high", eager images far below, a font preload without crossorigin and a face that fails to load returns the expected codes from the 10 snippets, with the font in target. The audit workflow on that page returns 24 issues, none without a code.

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Project	Deployment	Actions	Updated
webperf-snippets	Ready	Preview	Oct 25, 2026 11:36am UTC