I go to W3C for definitive guidance on HTML, where do I go for DNS?

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Where can I go to find the definitive answer to questions like the following?

'What makes a naked CNAME record break email on the domain?'

I would use W3C for HTML, or php.net for PHP - but is there a guiding body for DNS?

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DNS is defined by RFCs published by the IETF.

https://www.ietf.org/