Add vt-1 restriction

Author: noamr

css-view-transitions-1/Overview.bs

@@ -542,7 +542,7 @@ urlPrefix: https://wicg.github.io/navigation-api/; type: interface;
 
 			Note: Since currently only document-scoped view transitions are supported, only view transition names that are associated with the document are respected.
 
-			The values <css>none</css> and <css>auto</css> are excluded from <<custom-ident>> here.
+			The values <css>none</css>, <css>auto</css>, and <css>match-element</css> are excluded from <<custom-ident>> here.
 
 			Note: If this name is not unique
 			(i.e. if two elements simultaneously specify the same [=view transition name=])
@@ -1994,6 +1994,7 @@ Changes from <a href="https://www.w3.org/TR/2023/WD-css-view-transitions-1-20230
 * Fix scoping to match name instead of element. See <a href="https://github.com/w3c/csswg-drafts/issues/10145">issue 10145</a>.
 * Add a rendering characteristics note about out-of-viewport elements. See <a href="https://github.com/w3c/csswg-drafts/issues/8282">issue 8282</a>.
 * Swap the order of invoking the update callback and setting the phase. See <a href="https://github.com/w3c/csswg-drafts/issues/10822">issue 10822</a>.
+* Disallow <css>match-element</css> as a custom-ident. See <a href="https://github.com/w3c/csswg-drafts/issues/10995">Issue 10995</a>.
 
 <h3 id="changes-since-2022-05-25">
 Changes from <a href="https://www.w3.org/TR/2023/WD-css-view-transitions-1-20230525/">2022-05-25 Working Draft</a>