Where Yahoo fits in your markup workflow
Use Yahoo’s webmaster guidance and its documented connection to Bing.
Start with the documented submission path
Yahoo’s help center directs site owners to Bing Webmaster Tools for website submission. Its webmaster guidance also points to Bing’s optimization resources and describes results coming from Yahoo and Bing crawlers.
Keep expectations separate
Shared discovery infrastructure does not establish identical search presentation. Do not assume that a feature shown by Google or Bing must appear on Yahoo. Check Yahoo’s own results and current help pages.
What this app checks
Schema.org compatibility is relevant across consumers. CheckMySchema does not currently have a separate Yahoo rich-result requirements profile; this page is editorial guidance with primary-source links, not a Yahoo validation certification.
Go deeper with the official sources
Submit a site to Yahoo SearchYahoo webmaster toolsYahoo webmaster resourcesThis is an original explanatory guide, not an official search-engine document. Requirements can change. Follow the linked sources for full, current details.