diff --git a/html/semantics/scripting-1/the-script-element/module/credentials.sub.html b/html/semantics/scripting-1/the-script-element/module/credentials.sub.html
index 1293d7f6913453..c7cab6e958388f 100644
--- a/html/semantics/scripting-1/the-script-element/module/credentials.sub.html
+++ b/html/semantics/scripting-1/the-script-element/module/credentials.sub.html
@@ -39,7 +39,7 @@
   }).then(() => {
     const w = iframe.contentWindow;
 
-    assert_equals(w.sameOriginNone, 'not found',
+    assert_equals(w.sameOriginNone, 'found',
                   'Modules should be loaded without the credentials when the crossOrigin attribute is not specified and the target is same-origin');
     assert_equals(w.sameOriginAnonymous, 'found',
                   'Modules should be loaded with the credentials when the crossOrigin attribute is specified with "anonymous" as its value and the target is same-origin');
@@ -52,18 +52,32 @@
     assert_equals(w.crossOriginUseCredentials, 'found',
                   'Modules should be loaded with the credentials when the crossOrigin attribute is specified with "use-credentials" as its value and the target is cross-origin');
 
-    assert_equals(w.sameOriginNoneDecendent, 'not found',
-                  'Decendent modules should be loaded without the credentials when the crossOrigin attribute is not specified and the target is same-origin');
-    assert_equals(w.sameOriginAnonymousDecendent, 'found',
-                  'Decendent modules should be loaded with the credentials when the crossOrigin attribute is specified with "anonymous" as its value and the target is same-origin');
-    assert_equals(w.sameOriginUseCredentialsDecendent, 'found',
-                  'Decendent modules should be loaded with the credentials when the crossOrigin attribute is specified with "use-credentials" as its value and the target is same-origin');
-    assert_equals(w.crossOriginNoneDecendent, 'not found',
-                  'Decendent modules should be loaded without the credentials when the crossOrigin attribute is not specified and the target is cross-origin');
-    assert_equals(w.crossOriginAnonymousDecendent, 'not found',
-                  'Decendent modules should be loaded without the credentials when the crossOrigin attribute is specified with "anonymous" as its value and the target is cross-origin');
-    assert_equals(w.crossOriginUseCredentialsDecendent, 'found',
-                  'Decendent modules should be loaded with the credentials when the crossOrigin attribute is specified with "use-credentials" as its value and the target is cross-origin');
+    assert_equals(w.sameOriginNoneDescendant, 'found',
+                  'Descendant modules should be loaded without the credentials when the crossOrigin attribute is not specified and the target is same-origin');
+    assert_equals(w.sameOriginAnonymousDescendant, 'found',
+                  'Descendant modules should be loaded with the credentials when the crossOrigin attribute is specified with "anonymous" as its value and the target is same-origin');
+    assert_equals(w.sameOriginUseCredentialsDescendant, 'found',
+                  'Descendant modules should be loaded with the credentials when the crossOrigin attribute is specified with "use-credentials" as its value and the target is same-origin');
+    assert_equals(w.crossOriginNoneDescendant, 'not found',
+                  'Descendant modules should be loaded without the credentials when the crossOrigin attribute is not specified and the target is cross-origin');
+    assert_equals(w.crossOriginAnonymousDescendant, 'not found',
+                  'Descendant modules should be loaded without the credentials when the crossOrigin attribute is specified with "anonymous" as its value and the target is cross-origin');
+    assert_equals(w.crossOriginUseCredentialsDescendant, 'found',
+                  'Descendant modules should be loaded with the credentials when the crossOrigin attribute is specified with "use-credentials" as its value and the target is cross-origin');
+
+    assert_equals(w.sameOriginNoneDynamicDescendant, 'found',
+                  'Dynamic decendent modules should be loaded without the credentials when the crossOrigin attribute is not specified and the target is same-origin');
+    assert_equals(w.sameOriginAnonymousDynamicDescendant, 'found',
+                  'Dynamic descendant modules should be loaded with the credentials when the crossOrigin attribute is specified with "anonymous" as its value and the target is same-origin');
+    assert_equals(w.sameOriginUseCredentialsDynamicDescendant, 'found',
+                  'Dynamic descendant modules should be loaded with the credentials when the crossOrigin attribute is specified with "use-credentials" as its value and the target is same-origin');
+    assert_equals(w.crossOriginNoneDynamicDescendant, 'not found',
+                  'Dynamic descendant modules should be loaded without the credentials when the crossOrigin attribute is not specified and the target is cross-origin');
+    assert_equals(w.crossOriginAnonymousDynamicDescendant, 'not found',
+                  'Dynamic descendant modules should be loaded without the credentials when the crossOrigin attribute is specified with "anonymous" as its value and the target is cross-origin');
+    assert_equals(w.crossOriginUseCredentialsDynamicDescendant, 'found',
+                  'Dynamic descendant modules should be loaded with the credentials when the crossOrigin attribute is specified with "use-credentials" as its value and the target is cross-origin');
+
 });
 }, 'Modules should be loaded with or without the credentials based on the same-origin-ness and the crossOrigin attribute');
 </script>
diff --git a/html/semantics/scripting-1/the-script-element/module/resources/credentials-iframe.sub.html b/html/semantics/scripting-1/the-script-element/module/resources/credentials-iframe.sub.html
index f086e702822a42..d2b28714b1606d 100644
--- a/html/semantics/scripting-1/the-script-element/module/resources/credentials-iframe.sub.html
+++ b/html/semantics/scripting-1/the-script-element/module/resources/credentials-iframe.sub.html
@@ -25,24 +25,44 @@
 </script>
 
 <script type="module">
-import "./check-cookie.py?id=sameOriginNoneDecendent&cookieName=same";
+import "./check-cookie.py?id=sameOriginNoneDescendant&cookieName=same";
 </script>
 <script type="module" crossOrigin="anonymous">
-import "./check-cookie.py?id=sameOriginAnonymousDecendent&cookieName=same";
+import "./check-cookie.py?id=sameOriginAnonymousDescendant&cookieName=same";
 </script>
 <script type="module" crossOrigin="use-credentials">
-import "./check-cookie.py?id=sameOriginUseCredentialsDecendent&cookieName=same";
+import "./check-cookie.py?id=sameOriginUseCredentialsDescendant&cookieName=same";
 </script>
 <script type="module">
-import "http://{{domains[www2]}}:{{ports[http][0]}}/html/semantics/scripting-1/the-script-element/module/resources/check-cookie.py?id=crossOriginNoneDecendent&cookieName=cross";
+import "http://{{domains[www2]}}:{{ports[http][0]}}/html/semantics/scripting-1/the-script-element/module/resources/check-cookie.py?id=crossOriginNoneDescendant&cookieName=cross";
 </script>
 <script type="module" crossOrigin="anonymous">
-import "http://{{domains[www2]}}:{{ports[http][0]}}/html/semantics/scripting-1/the-script-element/module/resources/check-cookie.py?id=crossOriginAnonymousDecendent&cookieName=cross";
+import "http://{{domains[www2]}}:{{ports[http][0]}}/html/semantics/scripting-1/the-script-element/module/resources/check-cookie.py?id=crossOriginAnonymousDescendant&cookieName=cross";
 </script>
 <script type="module" crossOrigin="use-credentials">
-import "http://{{domains[www2]}}:{{ports[http][0]}}/html/semantics/scripting-1/the-script-element/module/resources/check-cookie.py?id=crossOriginUseCredentialsDecendent&cookieName=cross";
+import "http://{{domains[www2]}}:{{ports[http][0]}}/html/semantics/scripting-1/the-script-element/module/resources/check-cookie.py?id=crossOriginUseCredentialsDescendant&cookieName=cross";
 </script>
 
+<script type="module">
+import("./check-cookie.py?id=sameOriginNoneDynamicDescendant&cookieName=same");
+</script>
+<script type="module" crossOrigin="anonymous">
+import("./check-cookie.py?id=sameOriginAnonymousDynamicDescendant&cookieName=same");
+</script>
+<script type="module" crossOrigin="use-credentials">
+import("./check-cookie.py?id=sameOriginUseCredentialsDynamicDescendant&cookieName=same");
+</script>
+<script type="module">
+import("http://{{domains[www2]}}:{{ports[http][0]}}/html/semantics/scripting-1/the-script-element/module/resources/check-cookie.py?id=crossOriginNoneDynamicDescendant&cookieName=cross");
+</script>
+<script type="module" crossOrigin="anonymous">
+import("http://{{domains[www2]}}:{{ports[http][0]}}/html/semantics/scripting-1/the-script-element/module/resources/check-cookie.py?id=crossOriginAnonymousDynamicDescendant&cookieName=cross");
+</script>
+<script type="module" crossOrigin="use-credentials">
+import("http://{{domains[www2]}}:{{ports[http][0]}}/html/semantics/scripting-1/the-script-element/module/resources/check-cookie.py?id=crossOriginUseCredentialsDynamicDescendant&cookieName=cross");
+</script>
+
+
 <script type="text/javascript">
 window.addEventListener('load', event => {
   window.parent.postMessage({}, '*');