diff --git a/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-popover-closedby-complex.tentative.html b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-popover-closedby-complex.tentative.html
index 2f45e42d0ab5..a476ee1e3ae2 100644
--- a/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-popover-closedby-complex.tentative.html
+++ b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-popover-closedby-complex.tentative.html
@@ -328,6 +328,13 @@
 0
 ;
 }
+dialog
+{
+position
+:
+fixed
+;
+}
 <
 /
 style
@@ -692,14 +699,50 @@
 inside
 popoverA
 .
+/
+/
+Either
+way
+both
+popoverB
+and
+dialogB
+should
+close
+.
 assertStates
 (
-false
+true
 modalB
 false
 false
 )
 ;
+await
+clickOn
+(
+unrelated
+)
+;
+/
+/
+Clicking
+outside
+again
+should
+close
+the
+remaining
+two
+.
+assertStates
+(
+false
+false
+false
+false
+)
+;
 }
 clicking
 outside
@@ -740,27 +783,14 @@
 /
 Clicking
 popoverB
-will
+should
 keep
-both
-popovers
-plus
-the
-intervening
-dialogB
-/
-/
+everything
 open
-because
-they
-'
-re
-a
-stack
 .
 assertStates
 (
-false
+true
 true
 true
 true
@@ -803,15 +833,16 @@
 ;
 /
 /
-dialogB
-is
-nested
-inside
-popoverA
+Only
+popoverB
+should
+be
+light
+dismissed
 .
 assertStates
 (
-false
+true
 true
 true
 false
@@ -854,45 +885,20 @@
 ;
 /
 /
-If
-dialogB
-is
-modal
-then
-clicking
-popoverA
-is
-actually
-a
-backdrop
-/
-/
-click
-on
-dialogB
-which
-will
-close
-it
-.
-PopoverA
-stays
-open
-because
-/
-/
+Both
 dialogB
-is
-nested
-inside
-popoverA
+and
+popoverB
+should
+be
+light
+dismissed
 .
 assertStates
 (
-false
 true
-!
-modalB
+true
+false
 false
 )
 ;
@@ -928,26 +934,64 @@
 await
 clickOn
 (
-dialogB
+dialogA
 )
 ;
 /
 /
-Again
-this
+If
+dialogB
 is
-a
-backdrop
-click
+modal
+clicking
+on
+dialogA
+is
+actually
+clicking
 on
 dialogB
+/
+/
+which
+means
+popoverB
+will
+stay
+open
 .
 assertStates
 (
-false
 true
+modalB
+false
+false
+)
+;
+await
+clickOn
+(
+dialogA
+)
+;
+/
+/
+The
+next
+click
+on
+dialogA
+should
+light
+dismiss
+popoverA
+.
+assertStates
+(
 true
 false
+false
+false
 )
 ;
 }