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diff --git a/testing/web-platform/tests/webaudio/the-audio-api/the-iirfilternode-interface/ctor-iirfilter.html b/testing/web-platform/tests/webaudio/the-audio-api/the-iirfilternode-interface/ctor-iirfilter.html
new file mode 100644
index 0000000000..e884d487af
--- /dev/null
+++ b/testing/web-platform/tests/webaudio/the-audio-api/the-iirfilternode-interface/ctor-iirfilter.html
@@ -0,0 +1,126 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>
+      Test Constructor: IIRFilter
+    </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>
+    <script src="/webaudio/resources/audionodeoptions.js"></script>
+  </head>
+  <body>
+    <script id="layout-test-code">
+      let context;
+
+      let audit = Audit.createTaskRunner();
+
+      audit.define('initialize', (task, should) => {
+        context = initializeContext(should);
+        task.done();
+      });
+
+      audit.define('invalid constructor', (task, should) => {
+        testInvalidConstructor(should, 'IIRFilterNode', context);
+        task.done();
+      });
+
+      audit.define('default constructor', (task, should) => {
+        let prefix = 'node0';
+        let node = testDefaultConstructor(should, 'IIRFilterNode', context, {
+          prefix: prefix,
+          numberOfInputs: 1,
+          numberOfOutputs: 1,
+          channelCount: 2,
+          channelCountMode: 'max',
+          channelInterpretation: 'speakers',
+          constructorOptions: {feedforward: [1], feedback: [1, -.9]}
+        });
+
+        task.done();
+      });
+
+      audit.define('test AudioNodeOptions', (task, should) => {
+        testAudioNodeOptions(
+            should, context, 'IIRFilterNode',
+            {additionalOptions: {feedforward: [1, 1], feedback: [1, .5]}});
+        task.done();
+      });
+
+      audit.define('constructor options', (task, should) => {
+        let node;
+
+        let options = {feedback: [1, .5]};
+        should(
+            () => {
+              node = new IIRFilterNode(context, options);
+            },
+            'node = new IIRFilterNode(, ' + JSON.stringify(options) + ')')
+            .throw(TypeError);
+
+        options = {feedforward: [1, 0.5]};
+        should(
+            () => {
+              node = new IIRFilterNode(context, options);
+            },
+            'node = new IIRFilterNode(c, ' + JSON.stringify(options) + ')')
+            .throw(TypeError);
+
+        task.done();
+      });
+
+      // Test functionality of constructor.  This is needed because we have no
+      // way of determining if the filter coefficients were were actually set
+      // appropriately.
+
+      // TODO(rtoy): This functionality test should be moved out to a separate
+      // file.
+      audit.define('functionality', (task, should) => {
+        let options = {feedback: [1, .5], feedforward: [1, 1]};
+
+        // Create two-channel offline context; sample rate and length are fairly
+        // arbitrary.  Channel 0 contains the test output and channel 1 contains
+        // the expected output.
+        let sampleRate = 48000;
+        let renderLength = 0.125;
+        let testContext =
+            new OfflineAudioContext(2, renderLength * sampleRate, sampleRate);
+
+        // The test node uses the constructor.  The reference node creates the
+        // same filter but uses the old factory method.
+        let testNode = new IIRFilterNode(testContext, options);
+        let refNode = testContext.createIIRFilter(
+            Float32Array.from(options.feedforward),
+            Float32Array.from(options.feedback));
+
+        let source = testContext.createOscillator();
+        source.connect(testNode);
+        source.connect(refNode);
+
+        let merger = testContext.createChannelMerger(
+            testContext.destination.channelCount);
+
+        testNode.connect(merger, 0, 0);
+        refNode.connect(merger, 0, 1);
+
+        merger.connect(testContext.destination);
+
+        source.start();
+        testContext.startRendering()
+            .then(function(resultBuffer) {
+              let actual = resultBuffer.getChannelData(0);
+              let expected = resultBuffer.getChannelData(1);
+
+              // The output from the two channels should be exactly equal
+              // because exactly the same IIR filter should have been created.
+              should(actual, 'Output of filter using new IIRFilter(...)')
+                  .beEqualToArray(expected);
+            })
+            .then(() => task.done());
+      });
+
+      audit.run();
+    </script>
+  </body>
+</html>