Ship overflow: overlay.

The working group resolved on our behavior in
https://github.com/w3c/csswg-drafts/issues/8063#issuecomment-1431620007

Differential Revision: https://phabricator.services.mozilla.com/D170065

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1817189
gecko-commit: ec150f08ccde84efa804d8a61688c739b7a8d084
gecko-reviewers: dholbert
diff --git a/css/css-overflow/overflow-overlay.tentative.html b/css/css-overflow/overflow-overlay.html
similarity index 89%
rename from css/css-overflow/overflow-overlay.tentative.html
rename to css/css-overflow/overflow-overlay.html
index e3cb8d7..0e8ff09 100644
--- a/css/css-overflow/overflow-overlay.tentative.html
+++ b/css/css-overflow/overflow-overlay.html
@@ -3,10 +3,10 @@
 <link rel="match" href="overflow-overlay-ref.html">
 <style>
   div {
-      width: 15em;
-      height: 10em;
-      overflow: overlay;
-    }
+    width: 15em;
+    height: 10em;
+    overflow: overlay;
+  }
 </style>
 <div>
   <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>