They're relatively interchangeable, but the distinction to me is that properties in CSS are on the left side and values are on the right. So the --: declaratio

They're relatively interchangeable, but the distinction to me is that properties in CSS are on the left side and values are on the right. So the --: declarations are custom properties, with values that get used as variables in other declarations with var(). https://developer.mozilla.org/en-US/docs/Web/CSS/--* https://developer.mozilla.org/en-US/docs/Web/CSS/--*