diff --git a/testing/web-platform/tests/mathml/relations/html5-tree/clipboard-event-handlers.tentative.html b/testing/web-platform/tests/mathml/relations/html5-tree/clipboard-event-handlers.tentative.html
index 687fadcf34c5e..f0a39bfb47bc0 100644
--- a/testing/web-platform/tests/mathml/relations/html5-tree/clipboard-event-handlers.tentative.html
+++ b/testing/web-platform/tests/mathml/relations/html5-tree/clipboard-event-handlers.tentative.html
@@ -354,37 +354,17 @@
 "
 )
 ;
-async_test
-(
-test
-=
->
-{
 test
-.
-step
 (
-function
 (
 )
+=
+>
 {
-assert_true
-(
-MathMLElement
-.
-prototype
-.
-hasOwnProperty
-(
-on
-{
-name
-}
-)
-)
-;
-}
-)
+let
+target
+=
+undefined
 ;
 mathEl
 [
@@ -394,38 +374,19 @@
 }
 ]
 =
-test
-.
-step_func_done
 (
 e
+)
 =
 >
 {
-assert_equals
-(
+target
+=
 e
 .
 currentTarget
-mathEl
-"
-The
-event
-must
-be
-fired
-at
-the
-<
-math
->
-element
-"
-)
 ;
 }
-)
-;
 const
 event
 =
@@ -450,6 +411,25 @@
 event
 )
 ;
+assert_equals
+(
+target
+mathEl
+"
+The
+event
+must
+be
+fired
+at
+the
+<
+math
+>
+element
+"
+)
+;
 }
 {
 name
diff --git a/testing/web-platform/tests/mathml/relations/html5-tree/math-global-event-handlers.tentative.html b/testing/web-platform/tests/mathml/relations/html5-tree/math-global-event-handlers.tentative.html
index 356789484e2e0..40eca2de377d9 100644
--- a/testing/web-platform/tests/mathml/relations/html5-tree/math-global-event-handlers.tentative.html
+++ b/testing/web-platform/tests/mathml/relations/html5-tree/math-global-event-handlers.tentative.html
@@ -947,35 +947,13 @@
 attribute
 )
 ;
-async_test
-(
-t
-=
->
-{
-t
-.
-step
+test
 (
-function
 (
 )
+=
+>
 {
-assert_true
-(
-MathMLElement
-.
-prototype
-.
-hasOwnProperty
-(
-name
-)
-)
-;
-}
-)
-;
 const
 element
 =
@@ -1005,24 +983,43 @@
 "
 )
 ;
+let
+target
+=
+undefined
+;
 element
 [
 name
 ]
 =
-t
-.
-step_func_done
 (
 e
+)
 =
 >
 {
-assert_equals
-(
+target
+=
 e
 .
 currentTarget
+;
+}
+element
+.
+dispatchEvent
+(
+new
+Event
+(
+withoutOn
+)
+)
+;
+assert_equals
+(
+target
 element
 "
 The
@@ -1040,20 +1037,6 @@
 )
 ;
 }
-)
-;
-element
-.
-dispatchEvent
-(
-new
-Event
-(
-withoutOn
-)
-)
-;
-}
 {
 name
 }
diff --git a/testing/web-platform/tests/mathml/relations/html5-tree/tabindex-002.html b/testing/web-platform/tests/mathml/relations/html5-tree/tabindex-002.html
index 14aa397124497..7cc2595cb4e03 100644
--- a/testing/web-platform/tests/mathml/relations/html5-tree/tabindex-002.html
+++ b/testing/web-platform/tests/mathml/relations/html5-tree/tabindex-002.html
@@ -195,6 +195,24 @@
 div
 >
 <
+a
+href
+=
+"
+#
+link
+"
+>
+tabindex
+(
+html
+href
+)
+<
+/
+a
+>
+<
 math
 >
 <
@@ -457,9 +475,6 @@
 "
 text5
 "
-"
-text6
-"
 ]
 results
 =
@@ -509,6 +524,70 @@
 querySelector
 (
 "
+a
+"
+)
+.
+addEventListener
+(
+"
+focus
+"
+function
+(
+evt
+)
+{
+/
+/
+Links
+are
+tab
+-
+navigable
+on
+that
+platform
+.
+expectation
+.
+push
+(
+"
+text6
+"
+)
+;
+/
+/
+TAB
+=
+'
+\
+ue004
+'
+test_driver
+.
+send_keys
+(
+document
+.
+body
+"
+\
+ue004
+"
+)
+;
+}
+true
+)
+;
+document
+.
+querySelector
+(
+"
 math
 "
 )