diff --git a/html/semantics/scripting-1/the-script-element/css-module/css-module-worker-test.html b/html/semantics/scripting-1/the-script-element/css-module/css-module-worker-test.html
new file mode 100644
index 00000000000000..3c326b4e2be39a
--- /dev/null
+++ b/html/semantics/scripting-1/the-script-element/css-module/css-module-worker-test.html
@@ -0,0 +1,18 @@
+<!doctype html>
+
+<head>
+    <title>import-css-module-worker</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+</head>
+
+<body>
+    <h1>import-css-module-worker</h1>
+    <script>
+        async_test(function (test) {
+            const worker = new Worker("./modules/worker.js", { type: "module" });
+            worker.onmessage = test.step_func(() => { assert_unreached("A CSS Module within a web worker should not load.")});
+            worker.onerror = test.step_func_done();
+        }, "A CSS Module within a web worker should not load.");
+    </script>
+</body>
\ No newline at end of file
diff --git a/html/semantics/scripting-1/the-script-element/css-module/import-css-module-basic.html b/html/semantics/scripting-1/the-script-element/css-module/import-css-module-basic.html
new file mode 100644
index 00000000000000..c1c8b105c94538
--- /dev/null
+++ b/html/semantics/scripting-1/the-script-element/css-module/import-css-module-basic.html
@@ -0,0 +1,22 @@
+<!doctype html>
+
+<head>
+    <title>import-css-module-basic</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+</head>
+
+<body>
+    <h1>import-css-module-basic</h1>
+    <script type="module">
+        import v from "./modules/basic.css"
+        document.adoptedStyleSheets = [v];
+        test(function () {
+            assert_equals(getComputedStyle(document.querySelector('#test')).backgroundColor, "rgb(255, 0, 0)", "CSS module should import correctly on top level document");
+        }, "Test basic CSS module import");
+    </script>
+
+<div id="test">
+    I am a test div.
+</div>
+</body>
\ No newline at end of file
diff --git a/html/semantics/scripting-1/the-script-element/css-module/modules/basic.css b/html/semantics/scripting-1/the-script-element/css-module/modules/basic.css
new file mode 100644
index 00000000000000..3ea2ef45339c41
--- /dev/null
+++ b/html/semantics/scripting-1/the-script-element/css-module/modules/basic.css
@@ -0,0 +1,3 @@
+#test {
+    background-color:red;
+}
\ No newline at end of file
diff --git a/html/semantics/scripting-1/the-script-element/css-module/modules/worker.js b/html/semantics/scripting-1/the-script-element/css-module/modules/worker.js
new file mode 100644
index 00000000000000..63d1d6521b684f
--- /dev/null
+++ b/html/semantics/scripting-1/the-script-element/css-module/modules/worker.js
@@ -0,0 +1 @@
+import "./basic.css"
\ No newline at end of file
