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diff --git a/testing/web-platform/tests/webrtc/RTCRtpParameters-rtcp.html b/testing/web-platform/tests/webrtc/RTCRtpParameters-rtcp.html
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+++ b/testing/web-platform/tests/webrtc/RTCRtpParameters-rtcp.html
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+<!doctype html>
+<meta charset=utf-8>
+<title>RTCRtpParameters rtcp</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:
+  //   validateSenderRtpParameters
+
+  /*
+    5.2.  RTCRtpSender Interface
+      interface RTCRtpSender {
+        Promise<void>           setParameters(optional RTCRtpParameters parameters);
+        RTCRtpParameters        getParameters();
+      };
+
+      dictionary RTCRtpParameters {
+        DOMString                                 transactionId;
+        sequence<RTCRtpEncodingParameters>        encodings;
+        sequence<RTCRtpHeaderExtensionParameters> headerExtensions;
+        RTCRtcpParameters                         rtcp;
+        sequence<RTCRtpCodecParameters>           codecs;
+      };
+
+      dictionary RTCRtcpParameters {
+        [readonly]
+        DOMString cname;
+
+        [readonly]
+        boolean   reducedSize;
+      };
+
+      getParameters
+        - rtcp.cname is set to the CNAME of the associated RTCPeerConnection.
+
+          rtcp.reducedSize is set to true if reduced-size RTCP has been negotiated for
+          sending, and false otherwise.
+   */
+
+  /*
+    5.2.  setParameters
+      7.  If parameters.encodings.length is different from N, or if any parameter
+          in the parameters argument, marked as a Read-only parameter, has a value
+          that is different from the corresponding parameter value returned from
+          sender.getParameters(), abort these steps and return a promise rejected
+          with a newly created InvalidModificationError. Note that this also applies
+          to transactionId.
+   */
+  promise_test(t => {
+    const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
+    const { sender } = pc.addTransceiver('audio');
+
+    const param = sender.getParameters();
+    validateSenderRtpParameters(param);
+
+    const { rtcp } = param;
+
+    if(rtcp === undefined) {
+      param.rtcp = { cname: 'foo' };
+
+    } else if(rtcp.cname === undefined) {
+      rtcp.cname = 'foo';
+
+    } else {
+      rtcp.cname = `${rtcp.cname}-modified`;
+    }
+
+    return promise_rejects_dom(t, 'InvalidModificationError',
+      sender.setParameters(param));
+  }, `setParameters() with modified rtcp.cname should reject with InvalidModificationError`);
+
+  promise_test(t => {
+    const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
+    const { sender } = pc.addTransceiver('audio');
+
+    const param = sender.getParameters();
+    validateSenderRtpParameters(param);
+
+    const { rtcp } = param;
+
+    if(rtcp === undefined) {
+      param.rtcp = { reducedSize: true };
+
+    } else if(rtcp.reducedSize === undefined) {
+      rtcp.reducedSize = true;
+
+    } else {
+      rtcp.reducedSize = !rtcp.reducedSize;
+    }
+
+    return promise_rejects_dom(t, 'InvalidModificationError',
+      sender.setParameters(param));
+  }, `setParameters() with modified rtcp.reducedSize should reject with InvalidModificationError`);
+
+</script>