[css-variables-1] Please clarify in the Intro about custom properties *cascading*

[Tyler-H]

The CSS Variables spec Intro concludes by saying

and the change will propagate to all uses of that variable automatically.

But this isn't quite true. It will only propagate to all cascaded uses of that variable automatically, no? If that's correct, it would be useful to help clear up some confusion with authors thinking a CSS variable can be used in elements that do not cascade from the element where the custom property was declared.

If correct, I suggest simply adding in the word cascaded there:

and the changes will propagate to all cascaded uses of that variable automatically.

[tabatkins]

I don't think this is unclear in the intro, and the correction doesn't help (and possibly makes it worse) - it suggests that there are *non-*cascaded uses of a variable.

The cascade is intrinsic to the "use" of a variable here; using a var(--foo) on an element without a connection to any --foo property is the same as using a JS variable in one function that's only defined in an unrelated function.