How do I know if my site is not using material design? [closed]

I checked on google's design site, but couldn't find a comprehensive spec on this. There are only goals, principals and guidelines. In fact, in most websites I had searched there are only do's of material design, there are no don'ts.

That got me thinking about

• how do I know what is missing from my site for it be certified as an app on material design?

• how do I know that my app is not already on material design?

Someone told me that UX team these days put material design as their top priority and mandate that all websites should be on material design before it even come for review to them. So, I want to understand clearly when is an app not on material design.