HTML for email templates - where's the reference documentation????

HTML for email templates - where's the reference documentation????

I put HTML into a crm email template and it makes it through to gmail perfectly.  Put that same HTML into Zoho Subscriptions and it severly pukes.  

Why the h#77! can't this "common" capability be shared between the solutions????  Why is there no HTML reference for zoho email templates.  

Can anyone point me to a credible reference document/guide?  


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