diff --git a/testing/web-platform/meta/css/css-cascade/layer-rules-cssom.html.ini b/testing/web-platform/meta/css/css-cascade/layer-rules-cssom.html.ini
new file mode 100644
index 000000000000..9e5d65609fea
--- /dev/null
+++ b/testing/web-platform/meta/css/css-cascade/layer-rules-cssom.html.ini
@@ -0,0 +1,24 @@
+[layer-rules-cssom.html]
+  [Import into anonymous layer]
+    expected:
+      if not fission and (os == "win") and not debug: PASS
+      if not fission and (os == "mac"): PASS
+      if fission: PASS
+      if not fission and (os == "linux") and not debug: [FAIL, PASS]
+      FAIL
+
+  [Import into named layer]
+    expected:
+      if not fission and (os == "win") and not debug: PASS
+      if not fission and (os == "mac"): PASS
+      if fission: PASS
+      if not fission and (os == "linux") and not debug: [FAIL, PASS]
+      FAIL
+
+  [Import without layer]
+    expected:
+      if not fission and (os == "win") and not debug: PASS
+      if not fission and (os == "mac"): PASS
+      if fission: PASS
+      if not fission and (os == "linux") and not debug: [FAIL, PASS]
+      FAIL
diff --git a/testing/web-platform/meta/css/css-cascade/layer-statement-before-import.html.ini b/testing/web-platform/meta/css/css-cascade/layer-statement-before-import.html.ini
index dc11a4c5ee62..4d785fdf6a92 100644
--- a/testing/web-platform/meta/css/css-cascade/layer-statement-before-import.html.ini
+++ b/testing/web-platform/meta/css/css-cascade/layer-statement-before-import.html.ini
@@ -6,6 +6,10 @@
       if (os == "win") and debug and not fission and (processor == "x86"): [PASS, FAIL]
       if (os == "linux") and swgl: [PASS, FAIL]
       if os == "android": FAIL
+      if (os == "win") and debug and (processor == "x86_64") and not swgl: FAIL
+      if (os == "linux") and not fission and not swgl and debug: FAIL
+      if (os == "linux") and not fission and not swgl and not debug: [FAIL, PASS]
+      if (os == "win") and not debug and (processor == "x86"): [PASS, FAIL]
 
   [insertRule before imports]
     expected: FAIL
@@ -16,6 +20,10 @@
       if (os == "win") and debug and not fission and (processor == "x86"): [PASS, FAIL]
       if (os == "linux") and swgl: [PASS, FAIL]
       if os == "android": FAIL
+      if (os == "win") and debug and (processor == "x86_64") and not swgl: FAIL
+      if (os == "linux") and not fission and not swgl and debug: FAIL
+      if (os == "linux") and not fission and not swgl and not debug: [FAIL, PASS]
+      if (os == "win") and not debug and (processor == "x86"): [PASS, FAIL]
 
   [insert other rules to pre-import layer statements fails]
     expected: FAIL
@@ -26,6 +34,10 @@
       if (os == "win") and debug and not fission and (processor == "x86"): [PASS, FAIL]
       if (os == "linux") and swgl: [PASS, FAIL]
       if os == "android": FAIL
+      if (os == "linux") and not fission and not swgl and debug: FAIL
+      if (os == "win") and debug and (processor == "x86_64") and not swgl: FAIL
+      if (os == "linux") and not fission and not swgl and not debug: [FAIL, PASS]
+      if (os == "win") and not debug and (processor == "x86"): [PASS, FAIL]
 
   [deleteRule after imports]
     expected:
@@ -33,3 +45,7 @@
       if (os == "win") and debug and not fission and (processor == "x86"): [PASS, FAIL]
       if (os == "linux") and swgl: [PASS, FAIL]
       if os == "android": FAIL
+      if (os == "linux") and not fission and not swgl and debug: FAIL
+      if (os == "win") and debug and (processor == "x86_64") and not swgl: FAIL
+      if (os == "linux") and not fission and not swgl and not debug: [FAIL, PASS]
+      if (os == "win") and not debug and (processor == "x86"): [PASS, FAIL]