https://www.w3.org/TR/geometry-1/#transforming-a-point-with-a-matrix

Set pointVector to pointVector post-multiplied by matrix.

I believe "post-multiplied" should either be "pre-multiplied" or be rephrased such that it is clear that the column vector is on the right side of the matrix when multiplied.

(Multiplying vM, with v a [4x1] column vector and M a [4x4] matrix is not a valid vector-matrix multiplication. If v is a row-vector the product is defined by the result is incorrect).