diff --git a/testing/web-platform/meta/layout-instability/idlharness.window.js.ini b/testing/web-platform/meta/layout-instability/idlharness.window.js.ini
new file mode 100644
index 000000000000..419a18429954
--- /dev/null
+++ b/testing/web-platform/meta/layout-instability/idlharness.window.js.ini
@@ -0,0 +1,28 @@
+[idlharness.window.html]
+  [LayoutShift interface object name]
+    expected: FAIL
+
+  [LayoutShift interface: existence and properties of interface prototype object's "constructor" property]
+    expected: FAIL
+
+  [LayoutShift interface: attribute value]
+    expected: FAIL
+
+  [LayoutShift interface: existence and properties of interface prototype object]
+    expected: FAIL
+
+  [LayoutShift interface: existence and properties of interface object]
+    expected: FAIL
+
+  [LayoutShift interface: attribute lastInputTime]
+    expected: FAIL
+
+  [LayoutShift interface object length]
+    expected: FAIL
+
+  [LayoutShift interface: attribute hadRecentInput]
+    expected: FAIL
+
+  [LayoutShift interface: existence and properties of interface prototype object's @@unscopables property]
+    expected: FAIL
+