diff --git a/testing/web-platform/meta/html/semantics/forms/the-select-element/stylable-select/select-mouse-behavior.tentative.html.ini b/testing/web-platform/meta/html/semantics/forms/the-select-element/stylable-select/select-mouse-behavior.tentative.html.ini
index 634e660f058f..d861d4443319 100644
--- a/testing/web-platform/meta/html/semantics/forms/the-select-element/stylable-select/select-mouse-behavior.tentative.html.ini
+++ b/testing/web-platform/meta/html/semantics/forms/the-select-element/stylable-select/select-mouse-behavior.tentative.html.ini
@@ -4,3 +4,27 @@
 
   [Clicking an option in an appearance:base-select select should choose the option and close the popover.]
     expected: FAIL
+
+  [fallbackbutton-fallbackdatalist: Select with appearance:base-select should open and close when clicking the button.]
+    expected: FAIL
+
+  [fallbackbutton-fallbackdatalist: Clicking an option in an appearance:base-select select should choose the option and close the popover.]
+    expected: FAIL
+
+  [fallbackbutton-customdatalist: Select with appearance:base-select should open and close when clicking the button.]
+    expected: FAIL
+
+  [fallbackbutton-customdatalist: Clicking an option in an appearance:base-select select should choose the option and close the popover.]
+    expected: FAIL
+
+  [custombutton-fallbackdatalist: Select with appearance:base-select should open and close when clicking the button.]
+    expected: FAIL
+
+  [custombutton-fallbackdatalist: Clicking an option in an appearance:base-select select should choose the option and close the popover.]
+    expected: FAIL
+
+  [custombutton-customdatalist: Select with appearance:base-select should open and close when clicking the button.]
+    expected: FAIL
+
+  [custombutton-customdatalist: Clicking an option in an appearance:base-select select should choose the option and close the popover.]
+    expected: FAIL