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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/glsl/matrices/matrix-compound-multiply.html b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/matrices/matrix-compound-multiply.html
new file mode 100644
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/matrices/matrix-compound-multiply.html
@@ -0,0 +1,71 @@
+<!--
+Copyright (c) 2019 The Khronos Group Inc.
+Use of this source code is governed by an MIT-style license that can be
+found in the LICENSE.txt file.
+-->
+
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Matrix compound multiplication test</title>
+<link rel="stylesheet" href="../../../resources/js-test-style.css"/>
+<script src="../../../js/js-test-pre.js"></script>
+<script src="../../../js/webgl-test-utils.js"></script>
+</head>
+<body>
+<canvas id="canvas" width="256" height="256"> </canvas>
+<div id="description"></div>
+<div id="console"></div>
+<script id="vshader" type="x-shader/x-vertex">
+attribute vec3 aPosition;
+
+void main() {
+    gl_Position = vec4(aPosition, 1);
+}
+</script>
+<script id="fshader" type="x-shader/x-fragment">
+precision mediump float;
+
+void main() {
+    $(type) a = $(type)(0.0);
+    $(type) b = $(type)(0.0);
+    a[1][1] = 3.0; // 2nd column, 2nd row
+    b[0][1] = 2.0; // 1st column, 2nd row
+    $(type) c = a * b;
+    a *= b;
+    $(type) diffMat = a - c;
+    float diff = length(diffMat[0]) + length(diffMat[1]);
+    gl_FragColor = vec4(0.0, diff < 0.01 ? 1.0 : 0.0, 0.0, 1.0);
+}
+</script>
+<script type="application/javascript">
+"use strict";
+description("Matrix compound multiplication test comparing against normal multiplication.");
+debug("");
+var wtu = WebGLTestUtils;
+function test() {
+  var gl = wtu.create3DContext("canvas");
+  if (!gl) {
+    testFailed("context does not exist");
+    return;
+  }
+  wtu.setupUnitQuad(gl);
+  var fshaderTemplate = wtu.getScript('fshader');
+
+  var types = ['mat2', 'mat3', 'mat4'];
+  for (var i = 0; i < types.length; ++i) {
+    debug('');
+    debug('Testing type ' + types[i]);
+    var fshaderSource = wtu.replaceParams(fshaderTemplate, {type: types[i]});
+    var program = wtu.setupProgram(gl, ['vshader', fshaderSource], ["aPosition"], undefined, true);
+    wtu.drawUnitQuad(gl);
+    wtu.checkCanvas(gl, [0, 255, 0, 255], 'should be green');
+  }
+};
+
+test();
+finishTest();
+</script>
+</body>
+</html>