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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance2/glsl3/uniform-block-layout-match.html b/dom/canvas/test/webgl-conf/checkout/conformance2/glsl3/uniform-block-layout-match.html
new file mode 100644
index 0000000000..b92cefc882
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance2/glsl3/uniform-block-layout-match.html
@@ -0,0 +1,57 @@
+<!--
+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>WebGL2 Uniform Block Layout Behavior Testing</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-conformance-test.js"></script>
+</head>
+<body>
+<div id="description"></div>
+<div id="console"></div>
+<script id="ES3VertexShader" type="x-shader/x-vertex">#version 300 es
+layout(std140) uniform Block
+{
+  highp vec4 val;
+};
+
+void main() {
+    gl_Position = vec4(val);
+}
+</script>
+<script id="ES3FragmentShader" type="x-shader/x-fragment">#version 300 es
+uniform Block
+{
+  highp vec4 val;
+};
+out highp vec4 my_FragColor;
+void main() {
+    my_FragColor = vec4(val);
+}
+</script>
+<script type="application/javascript">
+"use strict";
+description();
+GLSLConformanceTester.runTests([
+  {
+    vShaderId: "ES3VertexShader",
+    vShaderSuccess: true,
+    fShaderId: "ES3FragmentShader",
+    fShaderSuccess: true,
+    linkSuccess: true,
+    passMsg: "A uniform block's layout defaults to std140 if not specified."
+  },
+], 2);
+var successfullyParsed = true;
+</script>
+</body>
+</html>