[css-overflow-5][editorial] Added WPT that strayed into CSS Pseudo

Author: SebastianZ

css-overflow-5/Overview.bs

@@ -17,6 +17,7 @@ Abstract: This module contains the features of CSS relating to scrollable overfl
 	(markers to indicate scroll progress, buttons to trigger scrolling),
 	and adding an appendix containing an experimental exploration
 	of <a href="#fragmentation">redirecting overflow by fragmentation</a>.
+Include MDN Panels: no
 </pre>
 <pre class="link-defaults">
 spec:css-multicol-1; type:dfn; text:overflow column
@@ -216,6 +217,10 @@ Use cases include a table of contents with links to relevant contents,
 markers for scrolling carousel pages,
 and scrollable tab panels.
 
+<wpt pathprefix="/css/css-pseudo/">
+	relative-box-order-of-pseudo-elements.html
+</wpt>
+
 Issue: Add images representing these examples.
 
 <h4 id="scroll-marker-grouping">