Verify that functions are reported properly from a shadow root.
Computed style:
--color-1: red
--color-2: green
--color-3: purple
--color-4: orange
--color-5: white
Functions for #test:
@function --defined-in-host() {result: --used-indirectly-in-host();} /* from document */
@function --used-in-both() {result: orange;} /* from shadow */
@function --used-in-both() {result: red;} /* from document */
@function --used-in-host() {result: --used-indirectly();} /* from document */
@function --used-in-shadow() {result: --used-indirectly();} /* from shadow */
@function --used-indirectly-in-host() {result: white;} /* from document */
@function --used-indirectly() {result: green;} /* from document */
@function --used-indirectly() {result: purple;} /* from shadow */