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+<!DOCTYPE html>
+<html>
+  <head>
+    <title>
+      Test AudioParam.exponentialRampToValueAtTime
+    </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>
+    <script src="/webaudio/resources/audioparam-testing.js"></script>
+  </head>
+  <body>
+    <script id="layout-test-code">
+      let audit = Audit.createTaskRunner();
+
+      // Play a long DC signal out through an AudioGainNode, and call
+      // setValueAtTime() and exponentialRampToValueAtTime() at regular
+      // intervals to set the starting and ending values for an exponential
+      // ramp.  Each time interval has a ramp with a different starting and
+      // ending value so that there is a discontinuity at each time interval
+      // boundary.  The discontinuity is for testing timing.  Also, we alternate
+      // between an increasing and decreasing ramp for each interval.
+
+      // Number of tests to run.
+      let numberOfTests = 100;
+
+      // Max allowed difference between the rendered data and the expected
+      // result.
+      let maxAllowedError = 1.222e-5;
+
+      // The AudioGainNode starts with this value instead of the default value.
+      let initialValue = 100;
+
+      // Set the gain node value to the specified value at the specified time.
+      function setValue(value, time) {
+        gainNode.gain.setValueAtTime(value, time);
+      }
+
+      // Generate an exponential ramp ending at time |endTime| with an ending
+      // value of |value|.
+      function generateRamp(value, startTime, endTime){
+          // |startTime| is ignored because the exponential ramp
+          // uses the value from the setValueAtTime() call above.
+          gainNode.gain.exponentialRampToValueAtTime(value, endTime)}
+
+      audit.define(
+          {
+            label: 'test',
+            description:
+                'AudioParam exponentialRampToValueAtTime() functionality'
+          },
+          function(task, should) {
+            createAudioGraphAndTest(
+                task, should, numberOfTests, initialValue, setValue,
+                generateRamp, 'exponentialRampToValueAtTime()', maxAllowedError,
+                createExponentialRampArray);
+          });
+
+      audit.run();
+    </script>
+  </body>
+</html>