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+<!doctype html>
+<meta charset=utf-8>
+<title>RTCRtpReceiver.prototype.getParameters</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="dictionary-helper.js"></script>
+<script src="RTCRtpParameters-helper.js"></script>
+<script>
+  'use strict';
+
+  // Test is based on the following editor draft:
+  // https://w3c.github.io/webrtc-pc/archives/20170605/webrtc.html
+
+  // The following helper functions are called from RTCRtpParameters-helper.js:
+  //   validateReceiverRtpParameters
+
+  /*
+    Validates the RTCRtpParameters returned from RTCRtpReceiver.prototype.getParameters
+
+    5.3.  RTCRtpReceiver Interface
+      getParameters
+        When getParameters is called, the RTCRtpParameters dictionary is constructed
+        as follows:
+
+        - The headerExtensions sequence is populated based on the header extensions that
+          the receiver is currently prepared to receive.
+
+        - The codecs sequence is populated based on the codecs that the receiver is currently
+          prepared to receive.
+
+        - rtcp.reducedSize is set to true if the receiver is currently prepared to receive
+          reduced-size RTCP packets, and false otherwise. rtcp.cname is left undefined.
+  */
+  promise_test(async t => {
+    const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
+    pc.addTransceiver('audio');
+    const callee = await doOfferAnswerExchange(t, pc);
+    const param = callee.getTransceivers()[0].receiver.getParameters();
+    validateReceiverRtpParameters(param);
+
+    assert_greater_than(param.headerExtensions.length, 0);
+    assert_greater_than(param.codecs.length, 0);
+  }, 'getParameters() with audio receiver');
+
+  promise_test(async t => {
+    const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
+    pc.addTransceiver('video');
+    const callee = await doOfferAnswerExchange(t, pc);
+    const param = callee.getTransceivers()[0].receiver.getParameters();
+    validateReceiverRtpParameters(param);
+
+    assert_greater_than(param.headerExtensions.length, 0);
+    assert_greater_than(param.codecs.length, 0);
+  }, 'getParameters() with video receiver');
+
+  promise_test(async t => {
+    const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
+    pc.addTransceiver('video', {
+      sendEncodings: [
+        { rid: "rid1" },
+        { rid: "rid2" }
+      ]
+    });
+    const callee = await doOfferAnswerExchange(t, pc);
+    const param = callee.getTransceivers()[0].receiver.getParameters();
+    validateReceiverRtpParameters(param);
+    assert_greater_than(param.headerExtensions.length, 0);
+    assert_greater_than(param.codecs.length, 0);
+  }, 'getParameters() with simulcast video receiver');
+</script>