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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/glsl/matrices/glsl-mat4-to-mat3.html b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/matrices/glsl-mat4-to-mat3.html
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/matrices/glsl-mat4-to-mat3.html
@@ -0,0 +1,70 @@
+<!--
+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>GLSL mat4 to mat3 test</title>
+<link rel="stylesheet" href="../../../resources/js-test-style.css"/>
+<link rel="stylesheet" href="../../../resources/glsl-feature-tests.css"/>
+<script src="../../../js/js-test-pre.js"></script>
+<script src="../../../js/webgl-test-utils.js"> </script>
+<script src="../../../js/glsl-generator.js"> </script>
+</head>
+<body>
+<div id="description"></div>
+<div id="console"></div>
+<script id="shader_emu" type="something-not-js">
+mat3 mat3_emu(mat4 m4) {
+  return mat3(
+      m4[0][0], m4[0][1], m4[0][2],
+      m4[1][0], m4[1][1], m4[1][2],
+      m4[2][0], m4[2][1], m4[2][2]);
+}
+</script>
+<script id="shader_test" type="something-not-js">
+  mat4 m4 = mat4($(input), $(input).yzwx, $(input).zwxy, $(input).wxyz);
+  mat3 m3 = $(conversion)(m4);
+  vec3 c;
+  if ($(input).y < 0.33) {
+    c = m3[0];
+  } else if ($(input).y > 0.66) {
+    c = m3[1];
+  } else {
+    c = m3[2];
+  }
+  $(output) = vec4(c, 1);
+</script>
+<script>
+"use strict";
+// See resources glsl-generator runBasicTest for how this works
+var wtu = WebGLTestUtils;
+GLSLGenerator.runBasicTest({
+  gridRes: 8,
+  tests: [
+    {
+      name: "mat4 to mat3",
+      reference: {
+        shader: wtu.getScript("shader_test"),
+        subs: {
+          emu: wtu.getScript("shader_emu"),
+          conversion: "mat3_emu"
+        }
+      },
+      test: {
+        shader: wtu.getScript("shader_test"),
+        subs: {
+          conversion: "mat3"
+        },
+      }
+    }
+  ]
+});
+var successfullyParsed = true;
+</script>
+</body>
+</html>