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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/more/functions/uniformMatrix.html b/dom/canvas/test/webgl-conf/checkout/conformance/more/functions/uniformMatrix.html
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index 0000000000..cae388fd4f
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance/more/functions/uniformMatrix.html
@@ -0,0 +1,69 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<!--
+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.
+-->
+<link rel="stylesheet" type="text/css" href="../unit.css" />
+<script type="application/javascript" src="../unit.js"></script>
+<script type="application/javascript" src="../util.js"></script>
+<script type="application/javascript">
+
+Tests.startUnit = function () {
+  var canvas = document.getElementById('gl');
+  var gl = wrapGLContext(getGLContext(canvas));
+  return [gl];
+}
+
+Tests.testUniformf = function(gl) {
+  var sh = new Filter(gl, 'foobar-vert', 'foobar-frag');
+  sh.apply(function(f){
+    var foo = f.uniform('foo');
+    var bar = f.uniform('bar');
+    var bar3 = f.uniform('bar3');
+    gl.uniformMatrix4fv(foo, false, [1,0,0,0, 0,2,0,0, 0,0,3,0, 0,0,0,4]);
+    gl.uniformMatrix2fv(bar, false, [2,1, 2,2]);
+    gl.uniformMatrix3fv(bar3, false, [2,2,2, 2,2,2, 2,1,2]);
+  });
+  var d = new Uint8Array(4);
+  gl.readPixels(0,0,1,1,gl.RGBA, gl.UNSIGNED_BYTE, d);
+  assertEquals([1,2,3,8], [d[0], d[1], d[2], d[3]]);
+  sh.destroy();
+}
+
+Tests.endUnit = function(gl) {
+}
+
+</script>
+<script id="foobar-vert" type="x-shader/x-vertex">
+attribute vec3 Vertex;
+attribute vec2 Tex;
+
+uniform mat2 bar;
+uniform mat3 bar3;
+
+varying vec4 texCoord0;
+void main()
+{
+    texCoord0 = vec4(Tex.s, 1.0-Tex.t, bar[0][1]+bar3[2][1], 0.0);
+    gl_Position = vec4(Vertex, 1.0);
+}
+</script>
+<script id="foobar-frag" type="x-shader/x-fragment">
+precision mediump float;
+
+uniform mat4 foo;
+
+varying vec4 texCoord0;
+void main()
+{
+    gl_FragColor = vec4(foo[0][0]/256.0, foo[1][1]/256.0, foo[2][2]/256.0, foo[3][3]*texCoord0.z/256.0);
+}
+</script>
+<style>canvas{ position:absolute; }</style>
+</head><body>
+<canvas id="gl" width="16" height="16"></canvas>
+</body></html>