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L1 · Transport:
l1-mixed-content
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l1-no-hsts
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l1-no-compression
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l1-slow-ttfb
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l1-xrobots-noindex
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l1-missing-vary
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l1-mixed-active-script
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l1-meta-refresh
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l1-html-oversize
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l1-cookie-wall
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l1-fake-500
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l1-no-cache-control
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l1-no-charset
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l1-no-etag
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l1-wrong-charset
L2 · Crawlability:
l2-robots-blocks-css
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l2-robots-blocks-section
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l2-soft-404
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l14-broken-source
L3 · Head Tags:
l14-no-meta-desc
L4 · Indexability:
l4-meta-noindex
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l4-canonical-to-noindex
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l4-canonical-chain
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l4-canonical-to-404
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l4-meta-header-conflict
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l4-missing-canonical-dupe
L7 · Schema:
l7-schema-missing-author
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l7-schema-url-mismatch
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l7-schema-js-only
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l7-schema-deprecated-faq
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l7-schema-wrong-type
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l7-schema-malformed
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l7-schema-required-fields
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l7-schema-recommended-fields
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l7-schema-dates-invalid
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l7-schema-image-404
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l7-breadcrumb-missing
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l7-breadcrumb-mismatch
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l7-sameas-missing
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l7-sameas-404
L9 · Mobile:
l9-viewport-fixed
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l9-tap-targets-small
L12 · Security:
l12-mixed-content-asset
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l12-missing-security-headers
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l12-insecure-form-action
L15 · Authorship:
l15-no-byline
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l15-author-string
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l15-author-404
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l15-publisher-missing
L18 · Crawler Access:
l18-waf-vercel-challenge
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l18-just-a-moment-editorial
Clean twins:
clean-canonical
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clean-schema
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clean-robots
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clean-hreflang-en
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clean-pagination
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evidence-stability-l7-recommended-fields
Support routes:
l4-canonical-chain-mid
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l4-canonical-chain-end
l4-canonical-chain-end (C)
End of the A → B → C canonical chain. Self-canonical, clean.