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diff --git a/testing/web-platform/tests/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-postmessage-sharedarraybuffer.https.html b/testing/web-platform/tests/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-postmessage-sharedarraybuffer.https.html
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index 0000000000..a5dd004981
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+++ b/testing/web-platform/tests/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-postmessage-sharedarraybuffer.https.html
@@ -0,0 +1,76 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>
+      Test passing SharedArrayBuffer to an AudioWorklet
+    </title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/webaudio/resources/audit.js"></script>
+  </head>
+  <body>
+    <script id="layout-test-code">
+      let audit = Audit.createTaskRunner();
+
+      let context = new AudioContext();
+
+      let filePath = 'processors/sharedarraybuffer-processor.js';
+
+      audit.define(
+          'Test postMessage from AudioWorkletProcessor to AudioWorkletNode',
+          (task, should) => {
+            let workletNode =
+                new AudioWorkletNode(context, 'sharedarraybuffer-processor');
+
+            // After it is created, the worklet will send a new
+            // SharedArrayBuffer to the main thread.
+            //
+            // The worklet will then wait to receive a message from the main
+            // thread.
+            //
+            // When it receives the message, it will check whether it is a
+            // SharedArrayBuffer, and send this information back to the main
+            // thread.
+
+            workletNode.port.onmessage = (event) => {
+              let data = event.data;
+              switch (data.state) {
+                case 'created':
+                  should(
+                      data.sab instanceof SharedArrayBuffer,
+                      'event.data.sab from worklet is an instance of SharedArrayBuffer')
+                      .beTrue();
+
+                  // Send a SharedArrayBuffer back to the worklet.
+                  let sab = new SharedArrayBuffer(8);
+                  workletNode.port.postMessage(sab);
+                  break;
+
+                case 'received message':
+                  should(data.isSab, 'event.data from main thread is an instance of SharedArrayBuffer')
+                      .beTrue();
+                  task.done();
+                  break;
+
+                default:
+                  should(false,
+                         `Got unexpected message from worklet: ${data.state}`)
+                      .beTrue();
+                  task.done();
+                  break;
+              }
+            };
+
+            workletNode.port.onmessageerror = (event) => {
+              should(false, 'Got messageerror from worklet').beTrue();
+              task.done();
+            };
+          });
+
+      context.audioWorklet.addModule(filePath).then(() => {
+        audit.run();
+      });
+    </script>
+  </body>
+</html>
+