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diff --git a/testing/web-platform/tests/html/semantics/forms/constraints/form-validation-validity-valueMissing-weekmonth.html b/testing/web-platform/tests/html/semantics/forms/constraints/form-validation-validity-valueMissing-weekmonth.html
new file mode 100644
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+++ b/testing/web-platform/tests/html/semantics/forms/constraints/form-validation-validity-valueMissing-weekmonth.html
@@ -0,0 +1,55 @@
+
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>The constraint validation API Test: element.validity.valueMissing</title>
+<link rel="author" title="Intel" href="http://www.intel.com/">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#dom-validitystate-valuemissing">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#the-constraint-validation-api">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="support/validator.js"></script>
+<div id="log"></div>
+<form>
+  <input id="messagetest" type="checkbox" required="" disabled="">
+</form>
+
+<script>
+  var testElements = [
+    {
+      tag: "input",
+      types: ["month"],
+      testData: [
+        {conditions: {required: false, value: ""}, expected: false, name: "[target] The required attribute is not set"},
+        {conditions: {required: true, value: "2000-12"}, expected: false, name: "[target] Valid month string(2000-12)"},
+        {conditions: {required: true, value: "9999-01"}, expected: false, name: "[target] Valid month string(9999-01)"},
+        {conditions: {required: true, value: 1234567}, expected: true, expectedImmutable: false, name: "[target] The value attribute is a number(1234567)"},
+        {conditions: {required: true, value: new Date()}, expected: true, expectedImmutable: false, name: "[target] The value attribute is a Date object"},
+        {conditions: {required: true, value: "2000-99"}, expected: true, expectedImmutable: false, name: "[target] Invalid month string(2000-99)"},
+        {conditions: {required: true, value: "37-01"}, expected: true, expectedImmutable: false, name: "[target] Invalid month string(37-01)"},
+        {conditions: {required: true, value: "2000/01"}, expected: true, expectedImmutable: false, name: "[target] Invalid month string(2000/01)"},
+        {conditions: {required: true, value: ""}, expected: true, expectedImmutable: false, name: "[target] The value attribute is empty string"}
+      ]
+    },
+    {
+      tag: "input",
+      types: ["week"],
+      testData: [
+        {conditions: {required: false, value: ""}, expected: false, name: "[target] The required attribute is not set"},
+        {conditions: {required: true, value: "2000-W12"}, expected: false, name: "[target] Valid week string(2000-W12)"},
+        {conditions: {required: true, value: "9999-W01"}, expected: false, name: "[target] Valid week string(9999-W01)"},
+        {conditions: {required: true, value: 1234567}, expected: true, expectedImmutable: false, name: "[target] The value attribute is a number(1234567)"},
+        {conditions: {required: true, value: new Date()}, expected: true, expectedImmutable: false, name: "[target] The value attribute is a Date object"},
+        {conditions: {required: true, value: "2000-W99"}, expected: true, expectedImmutable: false, name: "[target] Invalid week string(2000-W99)"},
+        {conditions: {required: true, value: "2000-W00"}, expected: true, expectedImmutable: false, name: "[target] invalid week string(2000-W00)"},
+        {conditions: {required: true, value: "2000-w01"}, expected: true, expectedImmutable: false, name: "[target] invalid week string(2000-w01)"},
+        {conditions: {required: true, value: ""}, expected: true, expectedImmutable: false, name: "[target] The value attribute is empty string"}
+      ]
+    }
+  ];
+
+  validator.run_test(testElements, "valueMissing");
+
+  test(() => {
+    assert_equals(document.getElementById("messagetest").validationMessage, '');
+  }, 'validationMessage should return empty string when willValidate is false and valueMissing is true');
+</script>