The Code is the Design

1. The example given for  Subscription and paywalled content says "1 valid item with warnings detected" when tested on Google's own Testing Tool . When the @type is changed from "NewsArticle" to "WebPage" , which is one of the Supported types , the Testing Tool says "No rich results detected" .  2. The example given for Fact Check , when tested similarly, says "2 valid items detected: All have warnings" . The warning is Missing Field (firstAppearance) . Update (~May 2022) The documentation for appearance and firstAppearance under Fact Check says URL or CreativeWork . Fact Check s with URL s for appearance and firstAppearance, that have been showing as valid on the Testing Tool for months, are now showing Structured Data Warnings on Search Console . They continue to show as valid on the Testing Tool . Update (Jun 2022) Fact Check s with URL s for appearance and firstAppearance , which used to show no errors