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chromium/third_party/blink/web_tests/external/wpt/html/links/manifest/mime-type-application-json-manual.html 

<!DOCTYPE html>
<title>Test JSON MIME Type support (application/json)</title>
<link rel="help" href="https://html.spec.whatwg.org/#link-type-manifest" />
<link rel="manifest" href="mime-type-application-json.webmanifest" />
<h1>Test JSON MIME Type support for web manifest</h1>
<p>
  To pass, the use agent must treat the manifest valid (name is "pass"). The
  response's Content-Type metadata is a JSON MIME type "application/json".
</p>