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diff --git a/testing/web-platform/tests/webaudio/the-audio-api/the-audioparam-interface/k-rate-oscillator.html b/testing/web-platform/tests/webaudio/the-audio-api/the-audioparam-interface/k-rate-oscillator.html
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+++ b/testing/web-platform/tests/webaudio/the-audio-api/the-audioparam-interface/k-rate-oscillator.html
@@ -0,0 +1,88 @@
+<!doctype html>
+<html>
+  <head>
+    <title>Test k-rate AudioParams of OscillatorNode</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/webaudio/resources/audit-util.js"></script>
+    <script src="/webaudio/resources/audit.js"></script>
+  </head>
+
+  <body>
+    <script>
+      let audit = Audit.createTaskRunner();
+
+      // Arbitrary sample rate and duration.
+      let sampleRate = 8000;
+
+      // Only new a few render quanta to verify things are working.
+      let testDuration = 4 * 128 / sampleRate;
+
+      [{name: 'detune', initial: 0, final: 1200}, {
+        name: 'frequency',
+        initial: 440,
+        final: sampleRate / 2
+      }].forEach(paramProperty => {
+        audit.define(
+            'Oscillator k-rate ' + paramProperty.name, (task, should) => {
+              let context = new OfflineAudioContext({
+                numberOfChannels: 3,
+                sampleRate: sampleRate,
+                length: testDuration * sampleRate
+              });
+
+              let merger = new ChannelMergerNode(
+                  context, {numberOfInputs: context.destination.channelCount});
+              merger.connect(context.destination);
+              let inverter = new GainNode(context, {gain: -1});
+              inverter.connect(merger, 0, 2);
+
+              let kRateNode = new OscillatorNode(context);
+              let aRateNode = new OscillatorNode(context);
+
+              kRateNode.connect(merger, 0, 0);
+              aRateNode.connect(merger, 0, 1);
+
+              kRateNode.connect(merger, 0, 2);
+              aRateNode.connect(inverter);
+
+              // Set the rate
+              kRateNode[paramProperty.name].automationRate = 'k-rate';
+
+              // Automate the offset
+              kRateNode[paramProperty.name].setValueAtTime(
+                  paramProperty.initial, 0);
+              kRateNode[paramProperty.name].linearRampToValueAtTime(
+                  paramProperty.final, testDuration);
+
+              aRateNode[paramProperty.name].setValueAtTime(
+                  paramProperty.initial, 0);
+              aRateNode[paramProperty.name].linearRampToValueAtTime(
+                  paramProperty.final, testDuration);
+
+              kRateNode.start();
+              aRateNode.start();
+
+              context.startRendering()
+                  .then(audioBuffer => {
+                    let kRateOut = audioBuffer.getChannelData(0);
+                    let aRateOut = audioBuffer.getChannelData(1);
+                    let diff = audioBuffer.getChannelData(2);
+
+                    // Verify that the outputs are different.
+                    should(
+                        diff,
+                        'k-rate ' + paramProperty.name +
+                            ': Difference between a-rate and k-rate outputs')
+                        .notBeConstantValueOf(0);
+
+                  })
+                  .then(() => task.done());
+            });
+      });
+
+
+      audit.run();
+    </script>
+  </body>
+</html>