Structured data

Format-level JSON-LD, Microdata, and RDFa fixtures covering valid types, invalid payloads, placement, multiplicity, JavaScript injection, and content conflicts.

Format-level structured data mechanics. Every machine-readable expectation — status, content type, markers, sitemap policy — lives in the typed registry; these pages explain behaviour for humans.

Families:

• Valid JSON-LD: one head block each for Article, BreadcrumbList, FAQPage, Product, and Organization, all parseable and complete.
• Invalid JSON-LD: a Product missing its required name, a syntactically valid block with a nonexistent @type, and a block whose JSON fails to parse while the page HTML stays intact.
• Placement and multiplicity: two blocks on one page, plus identical Article payloads placed once in the head and once at the end of the body.
• Rendering and conflict: an Article block injected by JavaScript after load, and a Product whose structured price disagrees with the visible price.
• Microdata and RDFa: attribute-markup Product baselines with zero JSON-LD on the page.

The invalid, JavaScript-injected, and conflict fixtures are crawlable without harm but stay out of the default sitemap, so a baseline crawl of sitemap URLs yields only clean structured data. Per-feature rich-result validation is out of scope here — this group owns the format mechanics only.

Fixtures in this category

• JSON-LD Article (valid) — jsonld-article-valid (safe)
• JSON-LD BreadcrumbList (valid) — jsonld-breadcrumb-valid (safe)
• JSON-LD FAQPage (valid) — jsonld-faq-valid (safe)
• JSON-LD Product (valid) — jsonld-product-valid (safe)
• JSON-LD Organization (valid) — jsonld-organization-valid (safe)
• JSON-LD Product missing required field — jsonld-missing-required-field (moderate)
• JSON-LD nonexistent type — jsonld-nonexistent-type (moderate)
• JSON-LD malformed JSON — jsonld-malformed-json (moderate)
• JSON-LD multiple blocks — jsonld-multiple-blocks (safe)
• JSON-LD head placement — jsonld-head-location (safe)
• JSON-LD body placement — jsonld-body-location (safe)
• JSON-LD injected by JavaScript — jsonld-js-injected (moderate)
• JSON-LD versus visible content conflict — jsonld-visible-content-conflict (moderate)
• Microdata Product (basic) — microdata-basic (safe)
• RDFa Product (basic) — rdfa-basic (safe)

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