For some reason the desmos engine doesn't do mod(x,3)=0, perhaps it's graphing an infinately small point. If you allow the value of the modular function to be less than a small number, say, mod(x,3)<0.01, then you will see the points you expect.
Verbatim is defined as an exact repetition without changing the words. An example of verbatim is when you quote someone exactly without changing anything. word for word; in exactly the same words. Origin of verbatim.
Duhaime's Law Dictionary. Verba Fortius Accipiuntur Contra Proferentem Definition: Latin: a principle of construction whereby if words of a contract are ambiguous, of two equally possible meanings, they should be interpreted against the author, drafter or writer of the contract and not against the other party.