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diff --git a/testing/web-platform/tests/webaudio/the-audio-api/the-gainnode-interface/idl-test.html b/testing/web-platform/tests/webaudio/the-audio-api/the-gainnode-interface/idl-test.html
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+++ b/testing/web-platform/tests/webaudio/the-audio-api/the-gainnode-interface/idl-test.html
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+<!DOCTYPE html>
+<html class="a">
+<head>
+<title>GainNode IDL Test</title>
+<script src="/resources/testharness.js"></script><script src="/resources/testharnessreport.js"></script><script src="/resources/idlharness.js"></script><script src="/resources/WebIDLParser.js"></script><script src="/webaudio/js/lodash.js"></script><script src="/webaudio/js/vendor-prefixes.js"></script><script src="/webaudio/js/helpers.js"></script><style type="text/css">
+    #event-target-idl,
+    #audio-context-idl,
+    #audio-node-idl,
+    #audio-param-idl
+    { visibility:hidden; height: 0px;}
+  </style>
+</head>
+<body class="a">
+
+   <pre id="event-target-idl">interface EventTarget {
+  void addEventListener(DOMString type, EventListener? callback, optional boolean capture = false);
+  void removeEventListener(DOMString type, EventListener? callback, optional boolean capture = false);
+  boolean dispatchEvent(Event event);
+};
+
+/*
+callback interface EventListener {
+  void handleEvent(Event event);
+};
+*/
+// Callback interfaces are not supported yet, but that's ok
+interface EventListener {};
+</pre>
+
+   <pre id="audio-context-idl">callback DecodeSuccessCallback = void (AudioBuffer decodedData);
+callback DecodeErrorCallback = void ();
+
+[Constructor]
+interface AudioContext : EventTarget {
+
+    readonly attribute AudioDestinationNode destination;
+    readonly attribute float sampleRate;
+    readonly attribute double currentTime;
+    readonly attribute AudioListener listener;
+
+    AudioBuffer createBuffer(unsigned long numberOfChannels, unsigned long length, float sampleRate);
+
+    void decodeAudioData(ArrayBuffer audioData,
+                         DecodeSuccessCallback successCallback,
+                         optional DecodeErrorCallback errorCallback);
+
+
+    // AudioNode creation
+    AudioBufferSourceNode createBufferSource();
+
+    MediaElementAudioSourceNode createMediaElementSource(HTMLMediaElement mediaElement);
+
+    MediaStreamAudioSourceNode createMediaStreamSource(MediaStream mediaStream);
+    MediaStreamAudioDestinationNode createMediaStreamDestination();
+
+    ScriptProcessorNode createScriptProcessor(optional unsigned long bufferSize = 0,
+                                              optional unsigned long numberOfInputChannels = 2,
+                                              optional unsigned long numberOfOutputChannels = 2);
+
+    AnalyserNode createAnalyser();
+    GainNode createGain();
+    DelayNode createDelay(optional double maxDelayTime = 1.0);
+    BiquadFilterNode createBiquadFilter();
+    WaveShaperNode createWaveShaper();
+    PannerNode createPanner();
+    ConvolverNode createConvolver();
+
+    ChannelSplitterNode createChannelSplitter(optional unsigned long numberOfOutputs = 6);
+    ChannelMergerNode createChannelMerger(optional unsigned long numberOfInputs = 6);
+
+    DynamicsCompressorNode createDynamicsCompressor();
+
+    OscillatorNode createOscillator();
+    PeriodicWave createPeriodicWave(Float32Array real, Float32Array imag);
+
+};</pre>
+
+   <pre id="audio-node-idl">enum ChannelCountMode {
+    "max",
+    "clamped-max",
+    "explicit"
+};
+
+enum ChannelInterpretation {
+    "speakers",
+    "discrete"
+};
+
+interface AudioNode : EventTarget {
+
+    void connect(AudioNode destination, optional unsigned long output = 0, optional unsigned long input = 0);
+    void connect(AudioParam destination, optional unsigned long output = 0);
+    void disconnect(optional unsigned long output = 0);
+
+    readonly attribute AudioContext context;
+    readonly attribute unsigned long numberOfInputs;
+    readonly attribute unsigned long numberOfOutputs;
+
+    // Channel up-mixing and down-mixing rules for all inputs.
+    attribute unsigned long channelCount;
+    attribute ChannelCountMode channelCountMode;
+    attribute ChannelInterpretation channelInterpretation;
+
+};</pre>
+
+   <pre id="audio-param-idl">interface AudioParam {
+
+    attribute float value;
+    readonly attribute float defaultValue;
+
+    // Parameter automation.
+    void setValueAtTime(float value, double startTime);
+    void linearRampToValueAtTime(float value, double endTime);
+    void exponentialRampToValueAtTime(float value, double endTime);
+
+    // Exponentially approach the target value with a rate having the given time constant.
+    void setTargetAtTime(float target, double startTime, double timeConstant);
+
+    // Sets an array of arbitrary parameter values starting at time for the given duration.
+    // The number of values will be scaled to fit into the desired duration.
+    void setValueCurveAtTime(Float32Array values, double startTime, double duration);
+
+    // Cancels all scheduled parameter changes with times greater than or equal to startTime.
+    void cancelScheduledValues(double startTime);
+
+};</pre>
+
+<pre id="gain-node-idl">interface GainNode : AudioNode {
+
+    readonly attribute AudioParam gain;
+
+};</pre>
+
+  <div id="log"></div>
+
+  <script>
+(function() {
+  var idl_array = new IdlArray();
+  idl_array.add_untested_idls(document.getElementById("event-target-idl").textContent);
+  idl_array.add_untested_idls(document.getElementById("audio-context-idl").textContent);
+  idl_array.add_untested_idls(document.getElementById("audio-node-idl").textContent);
+  idl_array.add_untested_idls(document.getElementById("audio-param-idl").textContent);
+  idl_array.add_idls(document.getElementById("gain-node-idl").textContent);
+
+  gain_node = (new AudioContext).createGain();
+
+  idl_array.add_objects({GainNode: ["gain_node"]});
+  idl_array.test();
+})();
+  </script>
+</body>
+</html>