[css-ui] expect resolved color in inheritance test

getComputedStyle returns the resolved color, not 'invert' or 'auto'
https://drafts.csswg.org/cssom/#resolved-value

outline-color initial value test now passes in Chrome/Firefox/Safari.
Fails Edge, which returns 'invert'.

css/css-ui/inheritance.html

@@ -23,20 +23,22 @@
 
 #container, #target {
   outline-style: dotted; /* Avoid outline-width computed style 0 */
+  color: black;
+  background: white;
 }
 </style>
 <script>
 const mediumWidth = getComputedStyle(reference).borderTopWidth; // e.g. 3px
 
 assert_not_inherited('appearance', 'auto', 'none');
-assert_inherited('caret-color', 'auto', 'rgba(42, 53, 64, 0.75)');
+assert_inherited('caret-color', 'rgb(0, 0, 0)', 'rgba(42, 53, 64, 0.75)');
 assert_inherited('caret-shape', 'auto', 'bar');
 assert_inherited('cursor', 'auto', 'pointer');
 assert_not_inherited('nav-down', 'auto', '#foo');
 assert_not_inherited('nav-left', 'auto', '#foo');
 assert_not_inherited('nav-right', 'auto', '#foo');
 assert_not_inherited('nav-up', 'auto', '#foo');
-assert_not_inherited('outline-color', 'invert', 'rgba(42, 53, 64, 0.75)');
+assert_not_inherited('outline-color', 'rgb(0, 0, 0)', 'rgba(42, 53, 64, 0.75)');
 assert_not_inherited('outline-offset', '0px', '10px');
 assert_not_inherited('outline-style', 'none', 'auto');
 assert_not_inherited('outline-width', mediumWidth, '10px');