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+<!DOCTYPE HTML>
+<html>
+<head>
+  <script type="application/javascript" src="pc.js"></script>
+  <script type="application/javascript" src="simulcast.js"></script>
+  <script type="application/javascript" src="helpers_from_wpt/sdp.js"></script>
+</head>
+<body>
+<pre id="test">
+<script type="application/javascript">
+createHTML({
+  bug: "1401592",
+  title: "Simulcast negotiation tests",
+  visible: true
+});
+
+// simulcast negotiation is mostly tested in wpt, but we test a few
+// implementation-specific things here.
+const tests = [
+  async function checkVideoEncodingLimit() {
+    const pc1 = new RTCPeerConnection();
+    const pc2 = new RTCPeerConnection();
+
+    const stream = await navigator.mediaDevices.getUserMedia({video: true});
+    const sender = pc1.addTrack(stream.getTracks()[0]);
+    pc2.addTrack(stream.getTracks()[0]);
+
+    await doOfferToRecvSimulcast(pc2, pc1, ["1", "2", "3", "4"]);
+
+    const {encodings} = sender.getParameters();
+    const rids = encodings.map(({rid}) => rid);
+    isDeeply(rids, ["1", "2", "3"]);
+
+    pc1.close();
+    pc2.close();
+    stream.getTracks().forEach(track => track.stop());
+  },
+
+  // wpt currently does not assume support for 3 encodings, which limits the
+  // effectiveness of its powers-of-2 test (since it can test only for 1 and 2)
+  async function checkScaleResolutionDownByAutoFillPowersOf2() {
+    const pc1 = new RTCPeerConnection();
+    const pc2 = new RTCPeerConnection();
+    const stream = await navigator.mediaDevices.getUserMedia({video: true});
+    const sender = pc1.addTrack(stream.getTracks()[0]);
+    pc2.addTrack(stream.getTracks()[0]);
+
+    await doOfferToRecvSimulcast(pc2, pc1, ["1", "2", "3"]);
+
+    const {encodings} = sender.getParameters();
+    const scaleValues = encodings.map(({scaleResolutionDownBy}) => scaleResolutionDownBy);
+    isDeeply(scaleValues, [4, 2, 1]);
+  },
+
+  async function checkLibwebrtcRidLengthLimit() {
+    const pc1 = new RTCPeerConnection();
+    const pc2 = new RTCPeerConnection();
+
+    const stream = await navigator.mediaDevices.getUserMedia({video: true});
+    const sender = pc1.addTrack(stream.getTracks()[0]);
+    pc2.addTrack(stream.getTracks()[0]);
+
+    await doOfferToRecvSimulcast(pc2, pc1, ["foo", "wibblywobblyjeremybearimy"]);
+    const {encodings} = sender.getParameters();
+    const rids = encodings.map(({rid}) => rid);
+    isDeeply(rids, ["foo"]);
+
+    pc1.close();
+    pc2.close();
+    stream.getTracks().forEach(track => track.stop());
+  },
+];
+
+runNetworkTest(async () => {
+  for (const test of tests) {
+    info(`Running test: ${test.name}`);
+    await test();
+    info(`Done running test: ${test.name}`);
+  }
+});
+
+</script>
+</pre>
+</body>
+</html>