Now that the junk has been cleared from the board...
Dark matter and dark energy are thought to comprise 96 percent of the mass of the universe. This has generated speculation as to what form of substance(s) makes up their composition. I propose that dark matter and dark energy are both made up of the material that we commonly call "dark". We all know what dark is from personal experience. Dark is the stuff (in the sense of the German word "Stoff") that we see when we turn out the lights. Dark is not the absence of light. Dark is a material made up of particles having mass so if dark energy and dark matter are made up of dark, that alone explains why they have mass.
"Dark is also heavier than light."
For further enlightenment:
I once had a teacher,
That made me question light,
His theory was simple
And it could be right.-Mark.