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diff --git a/testing/web-platform/tests/webaudio/the-audio-api/the-constantsourcenode-interface/constant-source-basic.html b/testing/web-platform/tests/webaudio/the-audio-api/the-constantsourcenode-interface/constant-source-basic.html
new file mode 100644
index 0000000000..4f925df5cd
--- /dev/null
+++ b/testing/web-platform/tests/webaudio/the-audio-api/the-constantsourcenode-interface/constant-source-basic.html
@@ -0,0 +1,85 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>
+      Basic ConstantSourceNode Tests
+    </title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="../../resources/audit-util.js"></script>
+    <script src="../../resources/audit.js"></script>
+    <script src="../../resources/start-stop-exceptions.js"></script>
+  </head>
+  <body>
+    <script id="layout-test-code">
+      let context = new AudioContext();
+
+      let audit = Audit.createTaskRunner();
+
+      audit.define('createConstantSource()', (task, should) => {
+        let node;
+        let prefix = 'Factory method: ';
+
+        should(() => {
+          node = context.createConstantSource();
+        }, prefix + 'node = context.createConstantSource()').notThrow();
+        should(
+            node instanceof ConstantSourceNode,
+            prefix + 'node instance of ConstantSourceNode')
+            .beEqualTo(true);
+
+        verifyNodeDefaults(should, node, prefix);
+
+        task.done();
+      });
+
+      audit.define('new ConstantSourceNode()', (task, should) => {
+        let node;
+        let prefix = 'Constructor: ';
+
+        should(() => {
+          node = new ConstantSourceNode(context);
+        }, prefix + 'node = new ConstantSourceNode()').notThrow();
+        should(
+            node instanceof ConstantSourceNode,
+            prefix + 'node instance of ConstantSourceNode')
+            .beEqualTo(true);
+
+
+        verifyNodeDefaults(should, node, prefix);
+
+        task.done();
+      });
+
+      audit.define('start/stop exceptions', (task, should) => {
+        let node = new ConstantSourceNode(context);
+
+        testStartStop(should, node);
+        task.done();
+      });
+
+      function verifyNodeDefaults(should, node, prefix) {
+        should(node.numberOfInputs, prefix + 'node.numberOfInputs')
+            .beEqualTo(0);
+        should(node.numberOfOutputs, prefix + 'node.numberOfOutputs')
+            .beEqualTo(1);
+        should(node.channelCount, prefix + 'node.channelCount').beEqualTo(2);
+        should(node.channelCountMode, prefix + 'node.channelCountMode')
+            .beEqualTo('max');
+        should(
+            node.channelInterpretation, prefix + 'node.channelInterpretation')
+            .beEqualTo('speakers');
+
+        should(node.offset.value, prefix + 'node.offset.value').beEqualTo(1);
+        should(node.offset.defaultValue, prefix + 'node.offset.defaultValue')
+            .beEqualTo(1);
+        should(node.offset.minValue, prefix + 'node.offset.minValue')
+            .beEqualTo(Math.fround(-3.4028235e38));
+        should(node.offset.maxValue, prefix + 'node.offset.maxValue')
+            .beEqualTo(Math.fround(3.4028235e38));
+      }
+
+      audit.run();
+    </script>
+  </body>
+</html>