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diff --git a/dom/media/webrtc/tests/mochitests/test_peerConnection_basicScreenshare.html b/dom/media/webrtc/tests/mochitests/test_peerConnection_basicScreenshare.html
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index 0000000000..a90e63ced7
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+++ b/dom/media/webrtc/tests/mochitests/test_peerConnection_basicScreenshare.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <script type="application/javascript" src="pc.js"></script>
+</head>
+<body>
+<pre id="test">
+<script type="application/javascript">
+  createHTML({
+    bug: "1039666",
+    title: "Basic screenshare-only peer connection"
+  });
+
+  async function supportedVideoPayloadTypes() {
+    const pc = new RTCPeerConnection();
+    const offer = await pc.createOffer({offerToReceiveVideo: true});
+    return sdputils.getPayloadTypes(offer.sdp);
+  }
+
+  async function testScreenshare(payloadType) {
+    const options = {};
+    options.h264 = payloadType == 97 || payloadType == 126;
+    const test = new PeerConnectionTest(options);
+    const constraints = {
+      video: { mediaSource: "screen" },
+    };
+    test.setMediaConstraints([constraints], []);
+    test.chain.insertAfterEach("PC_LOCAL_CREATE_OFFER", [
+      function PC_LOCAL_ISOLATE_CODEC() {
+        info(`Forcing payload type ${payloadType}. Note that other associated ` +
+             `payload types, like RTX, are removed too.`);
+        test.originalOffer.sdp =
+          sdputils.removeAllButPayloadType(test.originalOffer.sdp, payloadType);
+      },
+    ]);
+    await test.run();
+  }
+
+  runNetworkTest(async () => {
+    await SpecialPowers.pushPrefEnv({ set: [["media.navigator.video.red_ulpfec_enabled", true]] });
+    await matchPlatformH264CodecPrefs();
+    const pts = await supportedVideoPayloadTypes();
+    ok(pts.includes("120"), "VP8 is supported");
+    ok(pts.includes("121"), "VP9 is supported");
+    if (pts.length > 2) {
+      is(pts.length, 6, "Expected VP8, VP9, two variants of H264, ULPFEC, and RED");
+      ok(pts.includes("97"), "H264 with no packetization-mode is supported");
+      ok(pts.includes("126"), "H264 with packetization-mode=1 is supported");
+      ok(pts.includes("122"), "RED is supported");
+      ok(pts.includes("123"), "ULPFEC is supported");
+    }
+    for (const pt of pts) {
+      if (pt == "122" || pt == "123") {
+        // ULPFEC and RED are meant to work combined with other codecs.
+        // Forcing sdp with only one of them is not supported and will result in failures.
+        continue;
+      }
+      await testScreenshare(pt);
+    }
+  });
+</script>
+</pre>
+</body>
+</html>