[css-scrollbar] Update test coverage

Author: frivoal

css-scrollbars-1/Overview.bs

@@ -125,8 +125,7 @@ Value Definitions</h3>
 		Missing:
 		* Tests checking that the property does anything
 		* Tests checking that the colors apply to the right parts
-		* Initial value
-		* Tests of animation type">
+		* Initial value">
 	</wpt>
 
 	<wpt title="The following tests have no basis in the spec:
@@ -154,6 +153,12 @@ Value Definitions</h3>
 		inheritance.html
 		scrollbar-color-parsing.html
 	</wpt>
+	<wpt pathprefix="web-animations/animation-model/animation-types">
+		scrollbar-interpolation.html
+		interpolation-per-property-002.html
+		addition-per-property-002.html
+		accumulation-per-property-002.html
+	</wpt>
 
 	This property allows the author to set colors of an element's scrollbars.
 
@@ -281,8 +286,7 @@ Value Definitions</h3>
 		Missing:
 		* Test that thin does something different fromm auto in at least some cases
 		* Test that none does not affect scrollability
-		* Initial value
-		* Tests of animation type">
+		* Initial value">
 	</wpt>
 
 	<pre class="propdef">
@@ -301,6 +305,11 @@ Value Definitions</h3>
 		scrollbar-width-parsing.html
 		textarea-scrollbar-width-none.html
 	</wpt>
+	<wpt pathprefix="web-animations/animation-model/animation-types">
+		interpolation-per-property-002.html
+		addition-per-property-002.html
+		accumulation-per-property-002.html
+	</wpt>
 
 	This property allows the author to specify
 	the desired thickness of an element’s scrollbars.

css-scrollbars-1/test-coverage.html

@@ -99,9 +99,7 @@ <h2 class="heading settled" data-level="2" id="scrollbar-color"><span class="sec
        <p>Tests checking that the colors apply to the right parts</p>
       </li><li data-md="">
        <p>Initial value</p>
-      </li><li data-md="">
-       <p>Tests of animation type</p>
-     </li></ul>
+      </li></ul>
     <p></p>
     <ul class="wpt-tests-list"></ul>
     <hr>
@@ -155,9 +153,7 @@ <h2 class="heading settled" data-level="3" id="scrollbar-width"><span class="sec
        <p>Test that none does not affect scrollability</p>
       </li><li data-md="">
        <p>Initial value</p>
-      </li><li data-md="">
-       <p>Tests of animation type</p>
-     </li></ul>
+      </li></ul>
     <p></p>
     <ul class="wpt-tests-list"></ul>
     <hr>