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diff --git a/testing/web-platform/tests/webaudio/the-audio-api/the-audioworklet-interface/audioworkletnode-output-channel-count.https.html b/testing/web-platform/tests/webaudio/the-audio-api/the-audioworklet-interface/audioworkletnode-output-channel-count.https.html
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index 0000000000..8dafa2f811
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+++ b/testing/web-platform/tests/webaudio/the-audio-api/the-audioworklet-interface/audioworkletnode-output-channel-count.https.html
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+<!DOCTYPE html>
+<html>
+  <head>
+    <title>
+      Test the construction of AudioWorkletNode with real-time context
+    </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">
+      const audit = Audit.createTaskRunner();
+      const context = new AudioContext();
+
+      setup(function () {
+        context.audioWorklet.addModule(
+          'processors/channel-count-processor.js').then(() => audit.run());
+
+        // Test if the output channe count dynamically changes if the input
+        // and output is 1.
+        audit.define(
+            {label: 'Dynamically change the channel count to if unspecified.'},
+            (task, should) => {
+              // Use arbitrary parameters for the test.
+              const buffer = new AudioBuffer({
+                numberOfChannels: 17,
+                length: 1,
+                sampleRate: context.sampleRate,
+              });
+              const source = new AudioBufferSourceNode(context);
+              source.buffer = buffer;
+
+              const node = new AudioWorkletNode(context, 'channel-count', {
+                numberOfInputs: 1,
+                numberOfOutputs: 1,
+              });
+
+              node.port.onmessage = (message) => {
+                const expected = message.data;
+                should(expected.outputChannel,
+                       'The expected output channel count').beEqualTo(17);
+                task.done();
+              };
+
+              // We need to make an actual connection becasue the channel count
+              // change happen when the rendering starts. It is to test if the
+              // channel count adapts to the upstream node correctly.
+              source.connect(node).connect(context.destination);
+              source.start();
+            });
+
+        // Test if outputChannelCount is honored as expected even if the input
+        // and output is 1.
+        audit.define(
+            {label: 'Givien outputChannelCount must be honored.'},
+            (task, should) => {
+              const node = new AudioWorkletNode(
+                  context, 'channel-count', {
+                    numberOfInputs: 1,
+                    numberOfOutputs: 1,
+                    outputChannelCount: [2],
+                  });
+
+              node.port.onmessage = (message) => {
+                const expected = message.data;
+                should(expected.outputChannel,
+                       'The expected output channel count').beEqualTo(2);
+                task.done();
+              };
+
+              // We need to make an actual connection becasue the channel count
+              // change might happen when the rendering starts. It is to test
+              // if the specified channel count is kept correctly.
+              node.connect(context.destination);
+            });
+      });
+    </script>
+  </body>
+</html>