diff --git a/components/script/dom/baseaudiocontext.rs b/components/script/dom/baseaudiocontext.rs
index 80eae097a8f..22f20f2031d 100644
--- a/components/script/dom/baseaudiocontext.rs
+++ b/components/script/dom/baseaudiocontext.rs
@@ -24,6 +24,7 @@ use crate::dom::bindings::codegen::Bindings::BaseAudioContextBinding::DecodeSucc
 use crate::dom::bindings::codegen::Bindings::BiquadFilterNodeBinding::BiquadFilterOptions;
 use crate::dom::bindings::codegen::Bindings::ChannelMergerNodeBinding::ChannelMergerOptions;
 use crate::dom::bindings::codegen::Bindings::ChannelSplitterNodeBinding::ChannelSplitterOptions;
+use crate::dom::bindings::codegen::Bindings::ConstantSourceNodeBinding::ConstantSourceOptions;
 use crate::dom::bindings::codegen::Bindings::GainNodeBinding::GainOptions;
 use crate::dom::bindings::codegen::Bindings::OscillatorNodeBinding::OscillatorOptions;
 use crate::dom::bindings::codegen::Bindings::PannerNodeBinding::PannerOptions;
@@ -37,6 +38,7 @@ use crate::dom::bindings::root::{DomRoot, MutNullableDom};
 use crate::dom::biquadfilternode::BiquadFilterNode;
 use crate::dom::channelmergernode::ChannelMergerNode;
 use crate::dom::channelsplitternode::ChannelSplitterNode;
+use crate::dom::constantsourcenode::ConstantSourceNode;
 use crate::dom::domexception::{DOMErrorName, DOMException};
 use crate::dom::eventtarget::EventTarget;
 use crate::dom::gainnode::GainNode;
@@ -378,6 +380,15 @@ impl BaseAudioContextMethods for BaseAudioContext {
         )
     }
 
+    /// https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createconstantsource
+    fn CreateConstantSource(&self) -> Fallible<DomRoot<ConstantSourceNode>> {
+        ConstantSourceNode::new(
+            &self.global().as_window(),
+            &self,
+            &ConstantSourceOptions::empty(),
+        )
+    }
+
     /// https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createchannelmerger
     fn CreateChannelMerger(&self, count: u32) -> Fallible<DomRoot<ChannelMergerNode>> {
         let mut opts = ChannelMergerOptions::empty();
diff --git a/components/script/dom/constantsourcenode.rs b/components/script/dom/constantsourcenode.rs
new file mode 100644
index 00000000000..27ee869054d
--- /dev/null
+++ b/components/script/dom/constantsourcenode.rs
@@ -0,0 +1,98 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use crate::dom::audioparam::AudioParam;
+use crate::dom::audioscheduledsourcenode::AudioScheduledSourceNode;
+use crate::dom::baseaudiocontext::BaseAudioContext;
+use crate::dom::bindings::codegen::Bindings::AudioParamBinding::AutomationRate;
+use crate::dom::bindings::codegen::Bindings::ConstantSourceNodeBinding::ConstantSourceNodeMethods;
+use crate::dom::bindings::codegen::Bindings::ConstantSourceNodeBinding::{
+    self, ConstantSourceOptions,
+};
+use crate::dom::bindings::error::Fallible;
+use crate::dom::bindings::reflector::reflect_dom_object;
+use crate::dom::bindings::root::{Dom, DomRoot};
+use crate::dom::window::Window;
+use dom_struct::dom_struct;
+use servo_media::audio::constant_source_node::ConstantSourceNodeOptions as ServoMediaConstantSourceOptions;
+use servo_media::audio::node::AudioNodeInit;
+use servo_media::audio::param::ParamType;
+use std::f32;
+
+#[dom_struct]
+pub struct ConstantSourceNode {
+    source_node: AudioScheduledSourceNode,
+    offset: Dom<AudioParam>,
+}
+
+impl ConstantSourceNode {
+    #[allow(unrooted_must_root)]
+    fn new_inherited(
+        window: &Window,
+        context: &BaseAudioContext,
+        options: &ConstantSourceOptions,
+    ) -> Fallible<ConstantSourceNode> {
+        let node_options = Default::default();
+        let source_node = AudioScheduledSourceNode::new_inherited(
+            AudioNodeInit::ConstantSourceNode(options.into()),
+            context,
+            node_options, /* 2, MAX, Speakers */
+            0,            /* inputs */
+            1,            /* outputs */
+        )?;
+        let node_id = source_node.node().node_id();
+        let offset = AudioParam::new(
+            window,
+            context,
+            node_id,
+            ParamType::Offset,
+            AutomationRate::A_rate,
+            *options.offset,
+            f32::MIN,
+            f32::MAX,
+        );
+
+        Ok(ConstantSourceNode {
+            source_node,
+            offset: Dom::from_ref(&offset),
+        })
+    }
+
+    #[allow(unrooted_must_root)]
+    pub fn new(
+        window: &Window,
+        context: &BaseAudioContext,
+        options: &ConstantSourceOptions,
+    ) -> Fallible<DomRoot<ConstantSourceNode>> {
+        let node = ConstantSourceNode::new_inherited(window, context, options)?;
+        Ok(reflect_dom_object(
+            Box::new(node),
+            window,
+            ConstantSourceNodeBinding::Wrap,
+        ))
+    }
+
+    pub fn Constructor(
+        window: &Window,
+        context: &BaseAudioContext,
+        options: &ConstantSourceOptions,
+    ) -> Fallible<DomRoot<ConstantSourceNode>> {
+        ConstantSourceNode::new(window, context, options)
+    }
+}
+
+impl ConstantSourceNodeMethods for ConstantSourceNode {
+    // https://webaudio.github.io/web-audio-api/#dom-constantsourcenode-offset
+    fn Offset(&self) -> DomRoot<AudioParam> {
+        DomRoot::from_ref(&self.offset)
+    }
+}
+
+impl<'a> From<&'a ConstantSourceOptions> for ServoMediaConstantSourceOptions {
+    fn from(options: &'a ConstantSourceOptions) -> Self {
+        Self {
+            offset: *options.offset,
+        }
+    }
+}
diff --git a/components/script/dom/mod.rs b/components/script/dom/mod.rs
index ff36a485529..02be0f69c83 100644
--- a/components/script/dom/mod.rs
+++ b/components/script/dom/mod.rs
@@ -254,6 +254,7 @@ pub mod closeevent;
 pub mod comment;
 pub mod compositionevent;
 pub mod console;
+pub mod constantsourcenode;
 mod create;
 pub mod crypto;
 pub mod css;
diff --git a/components/script/dom/webidls/BaseAudioContext.webidl b/components/script/dom/webidls/BaseAudioContext.webidl
index ee2cbc7c2d3..57fb677defd 100644
--- a/components/script/dom/webidls/BaseAudioContext.webidl
+++ b/components/script/dom/webidls/BaseAudioContext.webidl
@@ -31,7 +31,7 @@ interface BaseAudioContext : EventTarget {
                                        optional DecodeSuccessCallback successCallback,
                                        optional DecodeErrorCallback errorCallback);
   [Throws] AudioBufferSourceNode createBufferSource();
-  // ConstantSourceNode createConstantSource();
+  [Throws] ConstantSourceNode createConstantSource();
   // ScriptProcessorNode createScriptProcessor(optional unsigned long bufferSize = 0,
   //                                           optional unsigned long numberOfInputChannels = 2,
   //                                           optional unsigned long numberOfOutputChannels = 2);
diff --git a/components/script/dom/webidls/ConstantSourceNode.webidl b/components/script/dom/webidls/ConstantSourceNode.webidl
new file mode 100644
index 00000000000..6fb8dca1988
--- /dev/null
+++ b/components/script/dom/webidls/ConstantSourceNode.webidl
@@ -0,0 +1,17 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+/*
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/#ConstantSourceNode
+ */
+
+dictionary ConstantSourceOptions: AudioNodeOptions {
+  float offset = 1;
+};
+
+[Exposed=Window,
+ Constructor (BaseAudioContext context, optional ConstantSourceOptions options = {})]
+interface ConstantSourceNode : AudioScheduledSourceNode {
+  readonly attribute AudioParam offset;
+};
diff --git a/tests/wpt/metadata/webaudio/idlharness.https.window.js.ini b/tests/wpt/metadata/webaudio/idlharness.https.window.js.ini
index 2557846cc75..37aa74faea8 100644
--- a/tests/wpt/metadata/webaudio/idlharness.https.window.js.ini
+++ b/tests/wpt/metadata/webaudio/idlharness.https.window.js.ini
@@ -14,27 +14,15 @@
   [AudioNode interface: calling disconnect(AudioParam, unsigned long) on new ConvolverNode(context) with too few arguments must throw TypeError]
     expected: FAIL
 
-  [ConstantSourceNode interface: existence and properties of interface prototype object]
-    expected: FAIL
-
-  [AudioNode interface: new ConstantSourceNode(context) must inherit property "channelInterpretation" with the proper type]
-    expected: FAIL
-
   [AudioNode interface: new DelayNode(context) must inherit property "disconnect(AudioNode, unsigned long)" with the proper type]
     expected: FAIL
 
   [AudioNode interface: calling disconnect(AudioNode) on new ConvolverNode(context) with too few arguments must throw TypeError]
     expected: FAIL
 
-  [AudioNode interface: new ConstantSourceNode(context) must inherit property "disconnect(unsigned long)" with the proper type]
-    expected: FAIL
-
   [AudioProcessingEvent interface: new AudioProcessingEvent('', {\n        playbackTime: 0, inputBuffer: buffer, outputBuffer: buffer\n      }) must inherit property "outputBuffer" with the proper type]
     expected: FAIL
 
-  [ConstantSourceNode interface: attribute offset]
-    expected: FAIL
-
   [AudioContext interface: context must inherit property "createMediaStreamSource(MediaStream)" with the proper type]
     expected: FAIL
 
@@ -71,12 +59,6 @@
   [AudioNode interface: calling disconnect(AudioNode) on new WaveShaperNode(context) with too few arguments must throw TypeError]
     expected: FAIL
 
-  [AudioNode interface: calling disconnect(AudioNode, unsigned long) on new ConstantSourceNode(context) with too few arguments must throw TypeError]
-    expected: FAIL
-
-  [AudioNode interface: new ConstantSourceNode(context) must inherit property "numberOfInputs" with the proper type]
-    expected: FAIL
-
   [AudioNode interface: new MediaElementAudioSourceNode(context, {mediaElement: new Audio}) must inherit property "disconnect(AudioNode)" with the proper type]
     expected: FAIL
 
@@ -101,24 +83,15 @@
   [AudioNode interface: calling disconnect(AudioParam) on context.createScriptProcessor() with too few arguments must throw TypeError]
     expected: FAIL
 
-  [ConstantSourceNode interface object length]
-    expected: FAIL
-
   [AudioContext interface: operation close()]
     expected: FAIL
 
   [AudioProcessingEvent interface: existence and properties of interface prototype object's @@unscopables property]
     expected: FAIL
 
-  [BaseAudioContext interface: operation createConstantSource()]
-    expected: FAIL
-
   [WaveShaperNode interface: attribute curve]
     expected: FAIL
 
-  [BaseAudioContext interface: context must inherit property "createConstantSource()" with the proper type]
-    expected: FAIL
-
   [AudioWorkletNode interface: attribute onprocessorerror]
     expected: FAIL
 
@@ -212,9 +185,6 @@
   [AudioNode interface: calling disconnect(AudioNode, unsigned long) on new DynamicsCompressorNode(context) with too few arguments must throw TypeError]
     expected: FAIL
 
-  [AudioNode interface: calling connect(AudioNode, unsigned long, unsigned long) on new ConstantSourceNode(context) with too few arguments must throw TypeError]
-    expected: FAIL
-
   [AudioNode interface: calling connect(AudioParam, unsigned long) on new MediaElementAudioSourceNode(context, {mediaElement: new Audio}) with too few arguments must throw TypeError]
     expected: FAIL
 
@@ -287,18 +257,12 @@
   [AudioNode interface: new DynamicsCompressorNode(context) must inherit property "disconnect(AudioNode, unsigned long)" with the proper type]
     expected: FAIL
 
-  [AudioNode interface: new ConstantSourceNode(context) must inherit property "disconnect(AudioParam, unsigned long)" with the proper type]
-    expected: FAIL
-
   [AudioNode interface: calling disconnect(unsigned long) on new MediaElementAudioSourceNode(context, {mediaElement: new Audio}) with too few arguments must throw TypeError]
     expected: FAIL
 
   [IIRFilterNode interface: operation getFrequencyResponse(Float32Array, Float32Array, Float32Array)]
     expected: FAIL
 
-  [AudioNode interface: calling disconnect(AudioParam, unsigned long) on new ConstantSourceNode(context) with too few arguments must throw TypeError]
-    expected: FAIL
-
   [AudioNode interface: context.createScriptProcessor() must inherit property "connect(AudioParam, unsigned long)" with the proper type]
     expected: FAIL
 
@@ -425,9 +389,6 @@
   [PeriodicWave interface: existence and properties of interface object]
     expected: FAIL
 
-  [AudioNode interface: new ConstantSourceNode(context) must inherit property "context" with the proper type]
-    expected: FAIL
-
   [AudioNode interface: calling disconnect(AudioParam) on new DynamicsCompressorNode(context) with too few arguments must throw TypeError]
     expected: FAIL
 
@@ -446,9 +407,6 @@
   [DelayNode interface: new DelayNode(context) must inherit property "delayTime" with the proper type]
     expected: FAIL
 
-  [AudioNode interface: calling disconnect(AudioParam) on new ConstantSourceNode(context) with too few arguments must throw TypeError]
-    expected: FAIL
-
   [AudioProcessingEvent interface: attribute inputBuffer]
     expected: FAIL
 
@@ -488,9 +446,6 @@
   [Stringification of new PeriodicWave(context)]
     expected: FAIL
 
-  [BaseAudioContext interface: new OfflineAudioContext(1, 1, sample_rate) must inherit property "createConstantSource()" with the proper type]
-    expected: FAIL
-
   [AudioNode interface: calling disconnect(AudioParam) on new DelayNode(context) with too few arguments must throw TypeError]
     expected: FAIL
 
@@ -500,15 +455,9 @@
   [DelayNode interface: existence and properties of interface prototype object]
     expected: FAIL
 
-  [AudioNode interface: calling connect(AudioParam, unsigned long) on new ConstantSourceNode(context) with too few arguments must throw TypeError]
-    expected: FAIL
-
   [AudioNode interface: calling disconnect(AudioNode, unsigned long, unsigned long) on new MediaElementAudioSourceNode(context, {mediaElement: new Audio}) with too few arguments must throw TypeError]
     expected: FAIL
 
-  [AudioNode interface: new ConstantSourceNode(context) must inherit property "disconnect()" with the proper type]
-    expected: FAIL
-
   [DynamicsCompressorNode interface: existence and properties of interface prototype object's @@unscopables property]
     expected: FAIL
 
@@ -530,9 +479,6 @@
   [AudioNode interface: new MediaStreamAudioDestinationNode(context) must inherit property "channelCountMode" with the proper type]
     expected: FAIL
 
-  [AudioScheduledSourceNode interface: calling start(double) on new ConstantSourceNode(context) with too few arguments must throw TypeError]
-    expected: FAIL
-
   [MediaElementAudioSourceNode interface object length]
     expected: FAIL
 
@@ -548,9 +494,6 @@
   [AudioNode interface: calling disconnect(AudioNode, unsigned long, unsigned long) on new DynamicsCompressorNode(context) with too few arguments must throw TypeError]
     expected: FAIL
 
-  [AudioNode interface: new ConstantSourceNode(context) must inherit property "numberOfOutputs" with the proper type]
-    expected: FAIL
-
   [BaseAudioContext interface: operation createScriptProcessor(unsigned long, unsigned long, unsigned long)]
     expected: FAIL
 
@@ -560,18 +503,12 @@
   [BaseAudioContext interface: calling createDelay(double) on context with too few arguments must throw TypeError]
     expected: FAIL
 
-  [AudioNode interface: calling disconnect(AudioNode) on new ConstantSourceNode(context) with too few arguments must throw TypeError]
-    expected: FAIL
-
   [DynamicsCompressorNode interface: new DynamicsCompressorNode(context) must inherit property "threshold" with the proper type]
     expected: FAIL
 
   [AudioNode interface: new IIRFilterNode(context, {feedforward: [1\], feedback: [1\]}) must inherit property "disconnect(unsigned long)" with the proper type]
     expected: FAIL
 
-  [AudioNode interface: new ConstantSourceNode(context) must inherit property "connect(AudioNode, unsigned long, unsigned long)" with the proper type]
-    expected: FAIL
-
   [AudioNode interface: new ConvolverNode(context) must inherit property "numberOfOutputs" with the proper type]
     expected: FAIL
 
@@ -599,12 +536,6 @@
   [AudioParamMap interface: existence and properties of interface prototype object]
     expected: FAIL
 
-  [AudioNode interface: new ConstantSourceNode(context) must inherit property "connect(AudioParam, unsigned long)" with the proper type]
-    expected: FAIL
-
-  [AudioNode interface: new ConstantSourceNode(context) must inherit property "disconnect(AudioNode, unsigned long)" with the proper type]
-    expected: FAIL
-
   [IIRFilterNode interface: existence and properties of interface prototype object]
     expected: FAIL
 
@@ -635,9 +566,6 @@
   [PeriodicWave interface: existence and properties of interface prototype object's "constructor" property]
     expected: FAIL
 
-  [AudioScheduledSourceNode interface: calling stop(double) on new ConstantSourceNode(context) with too few arguments must throw TypeError]
-    expected: FAIL
-
   [Stringification of new AudioProcessingEvent('', {\n        playbackTime: 0, inputBuffer: buffer, outputBuffer: buffer\n      })]
     expected: FAIL
 
@@ -743,15 +671,9 @@
   [AudioNode interface: new MediaStreamAudioDestinationNode(context) must inherit property "disconnect(unsigned long)" with the proper type]
     expected: FAIL
 
-  [ConstantSourceNode interface object name]
-    expected: FAIL
-
   [MediaStreamAudioDestinationNode must be primary interface of new MediaStreamAudioDestinationNode(context)]
     expected: FAIL
 
-  [AudioNode interface: new ConstantSourceNode(context) must inherit property "disconnect(AudioNode, unsigned long, unsigned long)" with the proper type]
-    expected: FAIL
-
   [WaveShaperNode interface: new WaveShaperNode(context) must inherit property "curve" with the proper type]
     expected: FAIL
 
@@ -764,9 +686,6 @@
   [ConvolverNode interface: new ConvolverNode(context) must inherit property "buffer" with the proper type]
     expected: FAIL
 
-  [AudioNode interface: new ConstantSourceNode(context) must inherit property "channelCount" with the proper type]
-    expected: FAIL
-
   [AudioNode interface: calling disconnect(AudioNode, unsigned long) on new ConvolverNode(context) with too few arguments must throw TypeError]
     expected: FAIL
 
@@ -806,9 +725,6 @@
   [OfflineAudioContext interface: operation resume()]
     expected: FAIL
 
-  [AudioScheduledSourceNode interface: new ConstantSourceNode(context) must inherit property "start(double)" with the proper type]
-    expected: FAIL
-
   [AudioNode interface: new DynamicsCompressorNode(context) must inherit property "numberOfInputs" with the proper type]
     expected: FAIL
 
@@ -836,9 +752,6 @@
   [AudioNode interface: worklet_node must inherit property "context" with the proper type]
     expected: FAIL
 
-  [ConstantSourceNode interface: existence and properties of interface object]
-    expected: FAIL
-
   [AudioNode interface: calling disconnect(unsigned long) on new DynamicsCompressorNode(context) with too few arguments must throw TypeError]
     expected: FAIL
 
@@ -860,9 +773,6 @@
   [OfflineAudioContext interface: calling suspend(double) on new OfflineAudioContext(1, 1, sample_rate) with too few arguments must throw TypeError]
     expected: FAIL
 
-  [ConstantSourceNode interface: existence and properties of interface prototype object's @@unscopables property]
-    expected: FAIL
-
   [AudioWorkletNode interface: existence and properties of interface prototype object's @@unscopables property]
     expected: FAIL
 
@@ -875,9 +785,6 @@
   [MediaElementAudioSourceNode must be primary interface of new MediaElementAudioSourceNode(context, {mediaElement: new Audio})]
     expected: FAIL
 
-  [AudioNode interface: calling disconnect(unsigned long) on new ConstantSourceNode(context) with too few arguments must throw TypeError]
-    expected: FAIL
-
   [ScriptProcessorNode interface: attribute onaudioprocess]
     expected: FAIL
 
@@ -905,9 +812,6 @@
   [AudioWorkletNode interface: worklet_node must inherit property "parameters" with the proper type]
     expected: FAIL
 
-  [ConstantSourceNode interface: new ConstantSourceNode(context) must inherit property "offset" with the proper type]
-    expected: FAIL
-
   [AudioNode interface: new WaveShaperNode(context) must inherit property "numberOfInputs" with the proper type]
     expected: FAIL
 
@@ -917,18 +821,12 @@
   [PeriodicWave must be primary interface of new PeriodicWave(context)]
     expected: FAIL
 
-  [ConstantSourceNode interface: existence and properties of interface prototype object's "constructor" property]
-    expected: FAIL
-
   [AudioNode interface: calling disconnect(AudioNode, unsigned long, unsigned long) on new DelayNode(context) with too few arguments must throw TypeError]
     expected: FAIL
 
   [IIRFilterNode interface: new IIRFilterNode(context, {feedforward: [1\], feedback: [1\]}) must inherit property "getFrequencyResponse(Float32Array, Float32Array, Float32Array)" with the proper type]
     expected: FAIL
 
-  [AudioScheduledSourceNode interface: new ConstantSourceNode(context) must inherit property "stop(double)" with the proper type]
-    expected: FAIL
-
   [AudioNode interface: new ConvolverNode(context) must inherit property "numberOfInputs" with the proper type]
     expected: FAIL
 
@@ -1004,9 +902,6 @@
   [AudioNode interface: calling disconnect(AudioParam, unsigned long) on context.createScriptProcessor() with too few arguments must throw TypeError]
     expected: FAIL
 
-  [AudioNode interface: calling disconnect(AudioNode, unsigned long, unsigned long) on new ConstantSourceNode(context) with too few arguments must throw TypeError]
-    expected: FAIL
-
   [AudioNode interface: calling disconnect(AudioParam, unsigned long) on new DynamicsCompressorNode(context) with too few arguments must throw TypeError]
     expected: FAIL
 
@@ -1049,9 +944,6 @@
   [IIRFilterNode interface object length]
     expected: FAIL
 
-  [AudioNode interface: new ConstantSourceNode(context) must inherit property "disconnect(AudioParam)" with the proper type]
-    expected: FAIL
-
   [AudioNode interface: new MediaStreamAudioDestinationNode(context) must inherit property "channelInterpretation" with the proper type]
     expected: FAIL
 
@@ -1124,9 +1016,6 @@
   [AudioNode interface: new MediaElementAudioSourceNode(context, {mediaElement: new Audio}) must inherit property "channelCount" with the proper type]
     expected: FAIL
 
-  [AudioScheduledSourceNode interface: new ConstantSourceNode(context) must inherit property "onended" with the proper type]
-    expected: FAIL
-
   [AudioNode interface: new DelayNode(context) must inherit property "channelCountMode" with the proper type]
     expected: FAIL
 
@@ -1139,9 +1028,6 @@
   [DynamicsCompressorNode interface: existence and properties of interface object]
     expected: FAIL
 
-  [AudioNode interface: new ConstantSourceNode(context) must inherit property "channelCountMode" with the proper type]
-    expected: FAIL
-
   [IIRFilterNode interface: existence and properties of interface object]
     expected: FAIL
 
@@ -1277,9 +1163,6 @@
   [MediaStreamAudioSourceNode interface: existence and properties of interface prototype object]
     expected: FAIL
 
-  [AudioNode interface: new ConstantSourceNode(context) must inherit property "disconnect(AudioNode)" with the proper type]
-    expected: FAIL
-
   [AudioNode interface: calling connect(AudioNode, unsigned long, unsigned long) on new DelayNode(context) with too few arguments must throw TypeError]
     expected: FAIL
 
@@ -1337,9 +1220,6 @@
   [AudioNode interface: worklet_node must inherit property "numberOfInputs" with the proper type]
     expected: FAIL
 
-  [Stringification of new ConstantSourceNode(context)]
-    expected: FAIL
-
   [AudioNode interface: calling disconnect(AudioParam) on worklet_node with too few arguments must throw TypeError]
     expected: FAIL
 
@@ -1352,9 +1232,6 @@
   [AudioNode interface: context.createScriptProcessor() must inherit property "channelInterpretation" with the proper type]
     expected: FAIL
 
-  [ConstantSourceNode must be primary interface of new ConstantSourceNode(context)]
-    expected: FAIL
-
   [AudioProcessingEvent interface: new AudioProcessingEvent('', {\n        playbackTime: 0, inputBuffer: buffer, outputBuffer: buffer\n      }) must inherit property "inputBuffer" with the proper type]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/audioparam-close.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/audioparam-close.html.ini
index 6c0e19ae401..ce808893e24 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/audioparam-close.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/audioparam-close.html.ini
@@ -1,2 +1,19 @@
 [audioparam-close.html]
-  expected: ERROR
+  [# AUDIT TASK RUNNER FINISHED: 2 out of 2 tasks were failed.]
+    expected: FAIL
+
+  [< [interpolation\] 1 out of 7 assertions were failed.]
+    expected: FAIL
+
+  [< [no-nan\] 2 out of 5 assertions were failed.]
+    expected: FAIL
+
+  [X output[0\] is not equal to 10. Got NaN.]
+    expected: FAIL
+
+  [X output[1\]: Expected 3.4028234663852886e+38 for all values but found 127 unexpected values: \n\tIndex\tActual\n\t[0\]\tNaN\n\t[1\]\tNaN\n\t[2\]\tNaN\n\t[3\]\tNaN\n\t...and 123 more errors.]
+    expected: FAIL
+
+  [X output[1\] is not close to 1.1342744887950962e+38 within a relative error of 0 (RelErr=2). Got 3.4028234663852886e+38.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/event-insertion.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/event-insertion.html.ini
index acbb68b01a0..23792568fa4 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/event-insertion.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/event-insertion.html.ini
@@ -1,2 +1,58 @@
 [event-insertion.html]
-  expected: ERROR
+  [X Output at frame 512 (time 0.03125) is not equal to 4. Got 3.]
+    expected: FAIL
+
+  [< [Multiple exponential ramps at the same time\] 2 out of 6 assertions were failed.]
+    expected: FAIL
+
+  [< [Insert same event at same time\] 2 out of 15 assertions were failed.]
+    expected: FAIL
+
+  [X Multiple linear ramps: Output at frame 64 (0.00390625 sec) is not equal to 10. Got 7.]
+    expected: FAIL
+
+  [X Expo+Linear: At time 0.01556396484375 (frame 255) output is not close to 2.9871532226369792 within a relative error of 0.0000042533 (RelErr=0.6652331080903755). Got 1.]
+    expected: FAIL
+
+  [X Linear+SetTarget: At time 0.015625 (frame 256) and later does not equal [100,99.93898010253906,99.87800598144531,99.81706237792969,99.75615692138672,99.6952896118164,99.63446044921875,99.57366180419922,99.51290893554688,99.45218658447266,99.39151000976562,99.33086395263672,99.27025604248047,99.20968627929688,99.1491470336914,99.08865356445312...\] with an element-wise tolerance of {"absoluteThreshold":0,"relativeThreshold":1.7807e-7}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[1\]\t1.0000000000000000e+2\t9.9938980102539063e+1\t6.1019897460937500e-2\t6.1057154473990094e-4\t1.7796134186859131e-5\n\t[2\]\t1.0000000000000000e+2\t9.9878005981445313e+1\t1.2199401855468750e-1\t1.2214302574017222e-3\t1.7785276525115967e-5\n\t[3\]\t1.0000000000000000e+2\t9.9817062377929688e+1\t1.8293762207031250e-1\t1.8327289715025855e-3\t1.7774424297637941e-5\n\t[4\]\t1.0000000000000000e+2\t9.9756156921386719e+1\t2.4384307861328125e-1\t2.4443912650468570e-3\t1.7763578862991333e-5\n\t[5\]\t1.0000000000000000e+2\t9.9695289611816406e+1\t3.0471038818359375e-1\t3.0564171022527216e-3\t1.7752740221176149e-5\n\t...and 250 more errors.\n\tMax AbsError of 1.4413246154785156e+1 at index of 255.\n\t[255\]\t1.0000000000000000e+2\t8.5586753845214844e+1\t1.4413246154785156e+1\t1.6840510367821365e-1\t1.5240433257217408e-5\n\tMax RelError of 1.6840510367821365e-1 at index of 255.\n\t[255\]\t1.0000000000000000e+2\t8.5586753845214844e+1\t1.4413246154785156e+1\t1.6840510367821365e-1\t1.5240433257217408e-5\n]
+    expected: FAIL
+
+  [X Multiple exponential ramps: Output at frame 63 is not close to 1.978456026387951 within a relative error of 5.3924e-7 (RelErr=2.4304996397067242). Got 6.787092685699463.]
+    expected: FAIL
+
+  [X Output at frame 640 (time 0.0390625) is not equal to 5. Got 1.]
+    expected: FAIL
+
+  [# AUDIT TASK RUNNER FINISHED: 6 out of 6 tasks were failed.]
+    expected: FAIL
+
+  [< [Multiple linear ramps at the same time\] 2 out of 6 assertions were failed.]
+    expected: FAIL
+
+  [X Linear+Expo: At time 0.015625 (frame 256) and later, output: Expected 3 for all values but found 256 unexpected values: \n\tIndex\tActual\n\t[0\]\t99\n\t[1\]\t99\n\t[2\]\t99\n\t[3\]\t99\n\t...and 252 more errors.]
+    expected: FAIL
+
+  [X Linear+SetTarget: At time 0.01556396484375 (frame 255) output is not close to 2.9921875 within a relative error of 0 (RelErr=0.6657963446475196). Got 1.]
+    expected: FAIL
+
+  [X Linear+Expo: At time 0.01556396484375 (frame 255) output is not close to 1.99609375 within a relative error of 0 (RelErr=0.49902152641878667). Got 1.]
+    expected: FAIL
+
+  [X Expo+Linear: At time 0.015625 (frame 256) and later, output: Expected 2 for all values but found 256 unexpected values: \n\tIndex\tActual\n\t[0\]\t99\n\t[1\]\t99\n\t[2\]\t99\n\t[3\]\t99\n\t...and 252 more errors.]
+    expected: FAIL
+
+  [X Multiple exponential ramps: Output at frame 64 (0.00390625 sec) is not equal to 10. Got 7.]
+    expected: FAIL
+
+  [< [Linear + SetTarget\] 2 out of 7 assertions were failed.]
+    expected: FAIL
+
+  [< [Expo + Linear\] 2 out of 6 assertions were failed.]
+    expected: FAIL
+
+  [< [Linear + Expo\] 2 out of 6 assertions were failed.]
+    expected: FAIL
+
+  [X Multiple linear ramps: Output at frame 63 is not close to 1.984375 within a relative error of 0 (RelErr=2.4795649971548968). Got 6.904761791229248.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/k-rate-constant-source.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/k-rate-constant-source.html.ini
deleted file mode 100644
index dd19c6b7655..00000000000
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/k-rate-constant-source.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[k-rate-constant-source.html]
-  expected: ERROR
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/k-rate-panner.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/k-rate-panner.html.ini
deleted file mode 100644
index 3ca0eaddfd4..00000000000
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/k-rate-panner.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[k-rate-panner.html]
-  expected: ERROR
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/set-target-conv.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/set-target-conv.html.ini
index f6f20255f49..07257bfcbc0 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/set-target-conv.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/set-target-conv.html.ini
@@ -1,5 +1,4 @@
 [set-target-conv.html]
-  expected: ERROR
   [X src = new ConstantSourceNode(context) incorrectly threw ReferenceError: "ConstantSourceNode is not defined".]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-constantsourcenode-interface/constant-source-basic.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-constantsourcenode-interface/constant-source-basic.html.ini
deleted file mode 100644
index 0af07ce7439..00000000000
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-constantsourcenode-interface/constant-source-basic.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[constant-source-basic.html]
-  expected: ERROR
-  [X Factory method: node = context.createConstantSource() incorrectly threw TypeError: "context.createConstantSource is not a function".]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-constantsourcenode-interface/constant-source-output.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-constantsourcenode-interface/constant-source-output.html.ini
index 36ddcdb8688..7c8029698ec 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-constantsourcenode-interface/constant-source-output.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-constantsourcenode-interface/constant-source-output.html.ini
@@ -1,2 +1,22 @@
 [constant-source-output.html]
-  expected: ERROR
+  [X Connected param: ConstantSourceNode frames [10, 6000) does not equal [1.5446391105651855,1.5920131206512451,1.6374239921569824,1.6807208061218262,1.7217602729797363,1.7604060173034668,1.7965298891067505,1.830012321472168,1.8607419729232788,1.8886172771453857,1.9135454893112183,1.9354441165924072,1.954240322113037,1.969871997833252,1.9822871685028076,1.9914448261260986...\] with an element-wise tolerance of {"absoluteThreshold":0,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[119\]\t1.9689673185348511e+0\t1.9114032983779907e+0\t5.7564020156860352e-2\t3.0116103810069256e-2\t0.0000000000000000e+0\n\t[120\]\t2.0485177040100098e+0\t1.9335803985595703e+0\t1.1493730545043945e-1\t5.9442734078222211e-2\t0.0000000000000000e+0\n\t[121\]\t2.1245903968811035e+0\t1.9526615142822266e+0\t1.7192888259887695e-1\t8.8048482208180262e-2\t0.0000000000000000e+0\n\t[122\]\t2.1969339847564697e+0\t1.9685831069946289e+0\t2.2835087776184082e-1\t1.1599758067133706e-1\t0.0000000000000000e+0\n\t[123\]\t2.2653079032897949e+0\t1.9812927246093750e+0\t2.8401517868041992e-1\t1.4334841851115937e-1\t0.0000000000000000e+0\n\t...and 122 more errors.\n\tMax AbsError of 9.9994510412216187e-1 at index of 200.\n\t[200\]\t-4.5393562316894531e-1\t5.4600948095321655e-1\t9.9994510412216187e-1\t1.8313694889994769e+0\t0.0000000000000000e+0\n\tMax RelError of 3.4132869565217392e+4 at index of 181.\n\t[181\]\t-4.6791613101959229e-1\t1.3709068298339844e-5\t4.6792984008789063e-1\t3.4132869565217392e+4\t0.0000000000000000e+0\n]
+    expected: FAIL
+
+  [< [connected audioparam\] 1 out of 2 assertions were failed.]
+    expected: FAIL
+
+  [< [basic automation\] 1 out of 2 assertions were failed.]
+    expected: FAIL
+
+  [X Automation: ConstantSourceNode.linearRamp(1, 0.5) does not equal [0.5,0.5001666666666666,0.5003333333333333,0.5005,0.5006666666666667,0.5008333333333334,0.501,0.5011666666666666,0.5013333333333333,0.5015,0.5016666666666667,0.5018333333333334,0.502,0.5021666666666667,0.5023333333333333,0.5025...\] with an element-wise tolerance of {"absoluteThreshold":0,"relativeThreshold":7.161e-7}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[1\]\t5.0000000000000000e-1\t5.0016666666666665e-1\t1.6666666666664831e-4\t3.3322225924688100e-4\t3.5816935000000001e-7\n\t[2\]\t5.0016671419143677e-1\t5.0033333333333330e-1\t1.6661914189652904e-4\t3.3301627294442850e-4\t3.5828869999999996e-7\n\t[3\]\t5.0033342838287354e-1\t5.0049999999999994e-1\t1.6657161712640978e-4\t3.3281042382899057e-4\t3.5840804999999996e-7\n\t[4\]\t5.0050014257431030e-1\t5.0066666666666670e-1\t1.6652409235640153e-4\t3.3260471176378465e-4\t3.5852740000000001e-7\n\t[5\]\t5.0066691637039185e-1\t5.0083333333333335e-1\t1.6641696294150687e-4\t3.3228012567355778e-4\t3.5864675000000001e-7\n\t...and 2982 more errors.\n\tMax AbsError of 1.6666666666664831e-4 at index of 1.\n\tMax RelError of 3.3322225924688100e-4 at index of 1.\n]
+    expected: FAIL
+
+  [X start/stop: ConstantSourceNode frames [300, 6000): Expected 0 for all values but found 1 unexpected values: \n\tIndex\tActual\n\t[0\]\t1]
+    expected: FAIL
+
+  [< [start/stop\] 1 out of 3 assertions were failed.]
+    expected: FAIL
+
+  [# AUDIT TASK RUNNER FINISHED: 3 out of 6 tasks were failed.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-constantsourcenode-interface/ctor-constantsource.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-constantsourcenode-interface/ctor-constantsource.html.ini
deleted file mode 100644
index 2110cb2fbe9..00000000000
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-constantsourcenode-interface/ctor-constantsource.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[ctor-constantsource.html]
-  expected: ERROR
-  [X node0 = new ConstantSourceNode(context) incorrectly threw TypeError: "window[name\] is not a constructor".]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-constantsourcenode-interface/test-constantsourcenode.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-constantsourcenode-interface/test-constantsourcenode.html.ini
index 5616ec2eb54..1771a603d25 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-constantsourcenode-interface/test-constantsourcenode.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-constantsourcenode-interface/test-constantsourcenode.html.ini
@@ -1,19 +1,4 @@
 [test-constantsourcenode.html]
-  [ConstantSourceNode with no automation]
-    expected: FAIL
-
-  [ConstantSourceNode stop and start]
-    expected: FAIL
-
-  [ConstantSourceNode onended event]
-    expected: FAIL
-
-  [ConstantSourceNode can be constructed]
-    expected: FAIL
-
-  [ConstantSourceNode with automation]
-    expected: FAIL
-
   [ConstantSourceNode start and stop when work]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-pannernode-interface/panner-azimuth.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-pannernode-interface/panner-azimuth.html.ini
index 0b0e69931ef..3b102358c5e 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-pannernode-interface/panner-azimuth.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-pannernode-interface/panner-azimuth.html.ini
@@ -1,2 +1,13 @@
 [panner-azimuth.html]
-  expected: ERROR
+  [X Left channel: Expected 0.7071067690849304 for all values but found 16000 unexpected values: \n\tIndex\tActual\n\t[0\]\t0\n\t[1\]\t0\n\t[2\]\t0\n\t[3\]\t0\n\t...and 15996 more errors.]
+    expected: FAIL
+
+  [< [Azimuth calculation\] 2 out of 2 assertions were failed.]
+    expected: FAIL
+
+  [X Righteft channel: Expected 0.7071067690849304 for all values but found 16000 unexpected values: \n\tIndex\tActual\n\t[0\]\t0\n\t[1\]\t0\n\t[2\]\t0\n\t[3\]\t0\n\t...and 15996 more errors.]
+    expected: FAIL
+
+  [# AUDIT TASK RUNNER FINISHED: 1 out of 1 tasks were failed.]
+    expected: FAIL
+
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 1ac3961804f..a623d546a60 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -18919,7 +18919,7 @@
    "testharness"
   ],
   "mozilla/interfaces.html": [
-   "cb0317a6de33cc5283f3754bece13a3b04940423",
+   "f30dd3de4087a45476745c4a41dd6a5f7e9365e3",
    "testharness"
   ],
   "mozilla/interfaces.js": [
diff --git a/tests/wpt/mozilla/tests/mozilla/interfaces.html b/tests/wpt/mozilla/tests/mozilla/interfaces.html
index cb0317a6de3..f30dd3de408 100644
--- a/tests/wpt/mozilla/tests/mozilla/interfaces.html
+++ b/tests/wpt/mozilla/tests/mozilla/interfaces.html
@@ -36,6 +36,7 @@ test_interfaces([
   "ChannelSplitterNode",
   "CharacterData",
   "CloseEvent",
+  "ConstantSourceNode",
   "CSS",
   "CSSConditionRule",
   "CSSFontFaceRule",