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+++ b/testing/web-platform/tests/webaudio/the-audio-api/the-audioparam-interface/setTargetAtTime-after-event-within-block.html
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+<!DOCTYPE html>
+<title>Test setTargetAtTime after an event in the same processing block</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+promise_test(function() {
+  const bufferSize = 179;
+  const valueStartOffset = 42;
+  const targetStartOffset = 53;
+  const sampleRate = 48000;
+  const scheduledValue = -0.5;
+
+  var context = new OfflineAudioContext(1, bufferSize, sampleRate);
+
+  var gain = context.createGain();
+  gain.gain.setValueAtTime(scheduledValue, valueStartOffset/sampleRate);
+  gain.gain.setTargetAtTime(scheduledValue, targetStartOffset/sampleRate,
+                            128/sampleRate);
+  gain.connect(context.destination);
+
+  // Apply unit DC signal to gain node.
+  var source = context.createBufferSource();
+  source.buffer =
+    function() {
+      var buffer = context.createBuffer(1, 1, context.sampleRate);
+      buffer.getChannelData(0)[0] = 1.0;
+      return buffer;
+    }();
+  source.loop = true;
+  source.start();
+  source.connect(gain);
+
+  return context.startRendering().
+    then(function(buffer) {
+      assert_equals(buffer.length, bufferSize, "output buffer length");
+      var output = buffer.getChannelData(0);
+      var i = 0;
+      for (; i < valueStartOffset; ++i) {
+        // "Its default value is 1."
+        assert_equals(output[i], 1.0, "default gain at sample " + i);
+      }
+      for (; i < buffer.length; ++i) {
+        // "If the next event (having time T1) after this SetValue event is
+        // not of type LinearRampToValue or ExponentialRampToValue, then, for
+        // T0≤t<T1: v(t)=V".
+        // "Start exponentially approaching the target value at the given time
+        // with a rate having the given time constant."
+        // The target is the same value, and so the SetValue value continues.
+        assert_equals(output[i], scheduledValue,
+                      "scheduled value at sample " + i);
+      }
+    });
+});
+</script>