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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/glsl/misc/uninitialized-local-global-variables.html b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/misc/uninitialized-local-global-variables.html
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+<!--
+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>Uninitialized local/global variables should be initialized</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 id="vs_uninit_in_frag" type="x-shader/x-vertex">
+precision mediump float;
+attribute vec4 a_position;
+void main() {
+    gl_Position = a_position;
+}
+</script>
+
+<!-- Uninitialized local in vertex shader -->
+<script id="vs_uninit_local_in_vert" type="x-shader/x-vertex">
+precision mediump float;
+attribute vec4 a_position;
+varying vec3 v_uninit;
+void main() {
+    vec3 uninit; // uninitialized
+    v_uninit = uninit;
+    gl_Position = a_position;
+}
+</script>
+<script id="fs_uninit_local_in_vert" type="x-shader/x-fragment">
+precision mediump float;
+varying vec3 v_uninit;
+void main() {
+    gl_FragColor = v_uninit.xyzz;
+}
+</script>
+
+<!-- Uninitialized local in fragment shader -->
+<script id="fs_uninit_local_in_frag" type="x-shader/x-fragment">
+precision mediump float;
+void main() {
+    vec2 uninit; // uninitialized
+    gl_FragColor = uninit.xyyy;
+}
+</script>
+
+<!-- Uninitialized global in vertex shader -->
+<script id="vs_uninit_global_in_vert" type="x-shader/x-vertex">
+precision mediump float;
+attribute vec4 a_position;
+varying float v_uninit;
+float uninit; // uninitialized
+void main() {
+    v_uninit = uninit;
+    gl_Position = a_position;
+}
+</script>
+<script id="fs_uninit_global_in_vert" type="x-shader/x-fragment">
+precision mediump float;
+varying float v_uninit;
+void main() {
+    gl_FragColor = vec4(v_uninit);
+}
+</script>
+
+<!-- Uninitialized global in fragment shader -->
+<script id="fs_uninit_global_in_frag" type="x-shader/x-fragment">
+precision mediump float;
+vec4 uninit; // uninitialized
+void main() {
+    gl_FragColor = uninit;
+}
+</script>
+
+<!-- Uninitialized local int in fragment shader -->
+<script id="fs_uninit_local_int_in_frag" type="x-shader/x-fragment">
+precision mediump float;
+void main() {
+    int uninit;
+    gl_FragColor = vec4(uninit);
+}
+</script>
+
+<!-- Uninitialized local variable and another variable in the same declaration using it as an initializer in fragment shader -->
+<script id="fs_uninit_two_local_variables_in_declaration_in_frag" type="x-shader/x-fragment">
+precision mediump float;
+void main() {
+    vec2 uninit, uninit2 = uninit;
+    gl_FragColor = uninit2.xyyy;
+}
+</script>
+
+<!-- Uninitialized local array and another variable in the same declaration using it in its initializer in fragment shader -->
+<script id="fs_uninit_array_and_another_in_declaration_in_frag" type="x-shader/x-fragment">
+precision mediump float;
+void main() {
+    vec2 uninit[2], uninit2 = uninit[0];
+    gl_FragColor = uninit2.xyyy;
+}
+</script>
+
+<!-- Uninitialized global int in fragment shader -->
+<script id="fs_uninit_global_int_in_frag" type="x-shader/x-fragment">
+precision mediump float;
+int uninit; // uninitialized
+void main() {
+    gl_FragColor = vec4(uninit);
+}
+</script>
+
+<!-- Uninitialized local struct in fragment shader -->
+<script id="fs_uninit_local_struct_in_frag" type="x-shader/x-fragment">
+precision mediump float;
+struct S { vec4 v; };
+void main() {
+    S uninit; // uninitialized
+    gl_FragColor = uninit.v;
+}
+</script>
+
+<!-- Uninitialized global struct in fragment shader -->
+<script id="fs_uninit_global_struct_in_frag" type="x-shader/x-fragment">
+precision mediump float;
+struct S { vec4 v; };
+S uninit; // uninitialized
+void main() {
+    gl_FragColor = uninit.v;
+}
+</script>
+
+<!-- Uninitialized nameless local struct in fragment shader -->
+<script id="fs_uninit_nameless_local_struct_in_frag" type="x-shader/x-fragment">
+precision mediump float;
+void main() {
+    struct { vec4 v; } uninit; // uninitialized
+    gl_FragColor = uninit.v;
+}
+</script>
+
+<!-- Uninitialized nameless global struct in fragment shader -->
+<script id="fs_uninit_nameless_global_struct_in_frag" type="x-shader/x-fragment">
+precision mediump float;
+struct { vec4 v; } uninit; // uninitialized
+void main() {
+    gl_FragColor = uninit.v;
+}
+</script>
+
+<!-- Uninitialized local bool in fragment shader -->
+<script id="fs_uninit_local_bool_in_frag" type="x-shader/x-fragment">
+precision mediump float;
+void main() {
+    bool uninit[16]; // uninitialized
+    bool result;
+    for (int i = 0; i < 16; i++) {
+        result = result || uninit[i];
+    }
+    gl_FragColor = result ? vec4(1, 0, 0, 1) : vec4(0);
+}
+</script>
+
+<!-- Uninitialized global bool in fragment shader -->
+<script id="fs_uninit_global_bool_in_frag" type="x-shader/x-fragment">
+precision mediump float;
+bool uninit[16]; // uninitialized
+void main() {
+    bool result = false;
+    for (int i = 0; i < 16; i++) {
+        result = result || uninit[i];
+    }
+    gl_FragColor = result ? vec4(1, 0, 0, 1) : vec4(0);
+}
+</script>
+
+</head>
+<body>
+<canvas id="canvas" width="50" height="50"></canvas>
+<div id="description"></div>
+<div id="console"></div>
+<script>
+"use strict";
+description('Uninitialized local/global variables should be initialized: http://anglebug.com/1966');
+
+var wtu = WebGLTestUtils;
+var gl = wtu.create3DContext("canvas");
+wtu.setupUnitQuad(gl);
+
+var cases = [
+  {
+    name: "Uninitialized local variable in vertex shader",
+    prog: ["vs_uninit_local_in_vert", "fs_uninit_local_in_vert"],
+  },
+  {
+    name: "Uninitialized local variable in fragment shader",
+    prog: ["vs_uninit_in_frag", "fs_uninit_local_in_frag"],
+  },
+  {
+    name: "Uninitialized global variable in vertex shader",
+    prog: ["vs_uninit_global_in_vert", "fs_uninit_global_in_vert"],
+  },
+  {
+    name: "Uninitialized global variable in fragment shader",
+    prog: ["vs_uninit_in_frag", "fs_uninit_global_in_frag"],
+  },
+  {
+    name: "Uninitialized local int variable in fragment shader",
+    prog: ["vs_uninit_in_frag", "fs_uninit_local_int_in_frag"],
+  },
+  {
+    name: "Uninitialized local variable and another variable in the same declaration using it as an initializer in fragment shader",
+    prog: ["vs_uninit_in_frag", "fs_uninit_two_local_variables_in_declaration_in_frag"],
+  },
+  {
+    name: "Uninitialized local array and another variable in the same declaration using it in its initializer in fragment shader",
+    prog: ["vs_uninit_in_frag", "fs_uninit_array_and_another_in_declaration_in_frag"],
+  },
+  {
+    name: "Uninitialized global int variable in fragment shader",
+    prog: ["vs_uninit_in_frag", "fs_uninit_global_int_in_frag"],
+  },
+  {
+    name: "Uninitialized local struct variable in fragment shader",
+    prog: ["vs_uninit_in_frag", "fs_uninit_local_struct_in_frag"],
+  },
+  {
+    name: "Uninitialized global struct variable in fragment shader",
+    prog: ["vs_uninit_in_frag", "fs_uninit_global_struct_in_frag"],
+  },
+  {
+    name: "Uninitialized nameless local struct variable in fragment shader",
+    prog: ["vs_uninit_in_frag", "fs_uninit_nameless_local_struct_in_frag"],
+  },
+  {
+    name: "Uninitialized nameless global struct variable in fragment shader",
+    prog: ["vs_uninit_in_frag", "fs_uninit_nameless_global_struct_in_frag"],
+  },
+  {
+    name: "Uninitialized local bool array variable in fragment shader",
+    prog: ["vs_uninit_in_frag", "fs_uninit_local_bool_in_frag"],
+  },
+  {
+    name: "Uninitialized global bool array variable in fragment shader",
+    prog: ["vs_uninit_in_frag", "fs_uninit_global_bool_in_frag"],
+  },
+];
+
+function runTest() {
+  for (var i = 0; i < cases.length; ++i) {
+    debug("");
+    debug(cases[i].name);
+    var program = wtu.setupProgram(gl, cases[i].prog, ["a_position"], undefined, true);
+    gl.clearColor(1.0, 0.0, 0.0, 1.0);
+    wtu.clearAndDrawUnitQuad(gl);
+    wtu.checkCanvas(gl, [0, 0, 0, 0]);
+  }
+
+  debug("");
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
+}
+
+runTest();
+
+var successfullyParsed = true;
+</script>
+<script src="../../../js/js-test-post.js"></script>
+</body>
+</html>
+