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.
Often the words quote and quotation are used interchangeably. Quote is a verb and quotation is a noun. As A. A. Milne put it in a humorous note: A quotation is a handy thing to have about, saving one the trouble of thinking for oneself, always a laborious business..