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conformance · v139

v139 · spec-compliant-json-mime-type-detection — conformance probe

5 assertions drawn from the spec. Each is a single contract the spec text makes. Pass/fail reflects what this browser executed; blocked means the contract was not run because it needs user mediation, hardware, or another unavailable precondition. Open the page in Chrome stable / canary / Firefox / Safari to compare.

browser: spec: https://mimesniff.spec.whatwg.org/#json-mime-type chromestatus: #5470594816278528 generated 2026-06-05T14:11:52Z by manual-codex-devtools
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pass
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fail
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blocked
5
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id contract kind verdict detail
json-module-import-application-json A JSON module import accepts the literal application/json MIME type. spec ↗ script
json-module-import-text-json A JSON module import accepts the literal text/json MIME type. spec ↗ script
json-module-import-application-ld-json A JSON module import accepts a structured-syntax suffix type such as application/ld+json. spec ↗ script
json-module-import-image-svg-json The JSON MIME algorithm is broad: any type whose subtype ends in +json, such as image/svg+json, is treated as JSON. spec ↗ script
json-module-import-uppercase-parameterized-json JSON MIME matching lowercases the essence and strips parameters, so Application/Problem+JSON; charset=UTF-8 imports as JSON. spec ↗ script