Propagate allowed to support color components in math functions.

Thanks to the recent changes by Sajid and the changes in bug 2043078,
which make color components properly return numbers for type-checking
purposes, this is now trivial.

We could add an "allowed but only numbers" or so, but type checking will
basically deal with it (in fact we should probably allow parsing
~everything all the time and rely on unit() doing the type-checking).

Differential Revision: https://phabricator.services.mozilla.com/D303375

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1951206
gecko-commit: 84b5d08285154e0c7b1feb1604dc5302ca2ae024
gecko-commit-git: 8a7d2d52762439c5a429d6a73e0c272046d309e2
gecko-reviewers: sajidanwar

Author: emilio

css/css-color/parsing/color-computed-relative-color.html

@@ -893,6 +893,16 @@
   fuzzy_test_computed_color(`var(--mygray)`, `lch(62.75 0 326.96)`, 0.02);
   fuzzy_test_computed_color(`lch(from var(--mygray) l 30 h)`, `lch(62.75 30 326.96)`, 0.02);
   fuzzy_test_computed_color(`LCH(from var(--accent) l c calc(h + 180 * sibling-index()))`, `lch(65.49 39.45 10.11)`, 0.02);
+
+  // https://github.com/w3c/csswg-drafts/issues/13938
+  fuzzy_test_computed_color(`hsl(from hsl(200 50 50) h s calc(l + sin(3) * 100))`, `color(srgb 0.46168 0.700933 0.82056)`);
+  fuzzy_test_computed_color(`hsl(from hsl(200 50 50) h s calc(sin(pi / 4) * 100))`, `color(srgb 0.56066 0.755922 0.853553)`);
+  fuzzy_test_computed_color(`hsl(from hsl(200 50 50) h s calc((sin(50) + 2) * 20))`, `color(srgb 0.173763 0.405446 0.521288)`);
+  fuzzy_test_computed_color(`hsl(from hsl(200 50 50) h s calc((sin(l) + 2) * 20))`, `color(srgb 0.173763 0.405446 0.521288)`);
+  fuzzy_test_computed_color_using_currentcolor(`hsl(from currentColor h s calc((sin(l) + 2) * 20))`, `color(srgb 0.173763 0.405446 0.521288)`, `hsl(200 50 50)`);
+
+  // https://bugzilla.mozilla.org/show_bug.cgi?id=1951206
+  fuzzy_test_computed_color(`oklch(from green pow(l, 1) c h)`, `oklch(0.519752 0.176858 142.4953)`);
 </script>
 </body>
 </html>