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diff --git a/testing/web-platform/tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-grain.html b/testing/web-platform/tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-grain.html
new file mode 100644
index 0000000000..f554304a21
--- /dev/null
+++ b/testing/web-platform/tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-grain.html
@@ -0,0 +1,71 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>
+      Test Start Grain with Delayed Buffer Setting
+    </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 id="layout-test-code">
+      let audit = Audit.createTaskRunner();
+      let context;
+      let source;
+      let buffer;
+      let renderedData;
+
+      let sampleRate = 44100;
+
+      let testDurationSec = 1;
+      let testDurationSamples = testDurationSec * sampleRate;
+      let startTime = 0.9 * testDurationSec;
+
+      audit.define(
+          'Test setting the source buffer after starting the grain',
+          function(task, should) {
+            context =
+                new OfflineAudioContext(1, testDurationSamples, sampleRate);
+
+            buffer = createConstantBuffer(context, testDurationSamples, 1);
+            source = context.createBufferSource();
+            source.connect(context.destination);
+
+            // Start the source BEFORE we set the buffer. The grain offset and
+            // duration aren't important, as long as we specify some offset.
+            source.start(startTime, .1);
+            source.buffer = buffer;
+
+            // Render it!
+            context.startRendering()
+                .then(function(buffer) {
+                  checkResult(buffer, should);
+                })
+                .then(task.done.bind(task));
+            ;
+          });
+
+      function checkResult(buffer, should) {
+        let success = false;
+
+        renderedData = buffer.getChannelData(0);
+
+        // Check that the rendered data is not all zeroes.  Any non-zero data
+        // means the test passed.
+        let startFrame = Math.round(startTime * sampleRate);
+        for (k = 0; k < renderedData.length; ++k) {
+          if (renderedData[k]) {
+            success = true;
+            break;
+          }
+        }
+
+        should(success, 'Buffer was played').beTrue();
+      }
+
+      audit.run();
+    </script>
+  </body>
+</html>