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diff --git a/testing/web-platform/tests/media-source/mediasource-invalid-codec.html b/testing/web-platform/tests/media-source/mediasource-invalid-codec.html
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+++ b/testing/web-platform/tests/media-source/mediasource-invalid-codec.html
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+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>SourceBuffer handling of invalid codecs in the initialization segment</title>
+    <link rel="author" title="Alicia Boya García" href="mailto:aboya@igalia.com">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="mediasource-util.js"></script>
+</head>
+<body>
+<div id="log"></div>
+<script>
+    function testInvalidCodec(test, mediaElement, mediaSource, mediaType, url) {
+        assert_true(MediaSource.isTypeSupported(mediaType), `Media type not supported in this browser: isTypeSupported('${mediaType}')`);
+
+        MediaSourceUtil.loadBinaryData(test, url, (mediaData) => {
+            _testInvalidCodecWithData(test, mediaElement, mediaSource, mediaType, mediaData);
+        });
+    }
+
+    function _testInvalidCodecWithData(test, mediaElement, mediaSource, mediaType, mediaData) {
+        const sourceBuffer = mediaSource.addSourceBuffer(mediaType);
+        sourceBuffer.appendBuffer(mediaData);
+        test.expectEvent(sourceBuffer, 'error', 'Append ended with error');
+        test.waitForExpectedEvents(() => {
+            test.done();
+        })
+    }
+
+    // These test cases provide a typical media MIME type, but the actual files have been mangled to declare a different,
+    // unsupported, fictitious codec (MP4 fourcc: 'zzzz', WebM codec id 'V_ZZZ'). The browser should report a parsing
+    // error.
+
+    mediasource_test((test, mediaElement, mediaSource) => {
+        testInvalidCodec(test, mediaElement, mediaSource, 'video/mp4;codecs="avc1.4D4001"', 'mp4/invalid-codec.mp4');
+    }, 'Test an MP4 with an invalid codec results in an error.');
+
+    mediasource_test((test, mediaElement, mediaSource) => {
+        testInvalidCodec(test, mediaElement, mediaSource, 'video/webm; codecs="vp8"', 'webm/invalid-codec.webm');
+    }, 'Test a WebM with an invalid codec results in an error.');
+
+</script>
+</body>
+</html>