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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/glsl/misc/empty-declaration.html b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/misc/empty-declaration.html
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@@ -0,0 +1,111 @@
+<!--
+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>WebGL GLSL Conformance Tests - empty declarations</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="vertexEmptyDeclaration" type="text/something-not-javascript">
+// Vertex shader with an empty declaration should succeed.
+// See shading language grammar rules init_declarator_list and single_declaration
+// in ESSL specs.
+// Empty declarations are a side effect of how grammar for structs is defined.
+void main() {
+    float;
+    gl_Position = vec4(0.0);
+}
+</script>
+<script id="vertexEmptyDeclarationPlus" type="text/something-not-javascript">
+// Vertex shader with an empty declaration followed by declarator should succeed.
+// See shading language grammar rules init_declarator_list and single_declaration
+// in ESSL specs.
+void main() {
+    float, a = 0.0;
+    gl_Position = vec4(a);
+}
+</script>
+<script id="vertexEmptyStructDeclarationPlus" type="text/something-not-javascript">
+// Vertex shader with an empty declaration followed by declarator should succeed.
+// See shading language grammar rules init_declarator_list and single_declaration
+// in ESSL specs.
+
+struct S {
+    float member;
+}, a;
+
+void main() {
+    a.member = 0.0;
+    gl_Position = vec4(a.member);
+}
+</script>
+<script id="vertexEmptyDeclarationInStruct" type="text/something-not-javascript">
+// Vertex shader with an empty declaration inside struct should fail.
+// In-struct declarations have different grammar from declarations outside structs.
+struct S {
+    float;
+    float a;
+};
+
+void main() {
+    gl_Position = vec4(0.0);
+}
+</script>
+<script id="vertexEmptyDeclarationPlusInStruct" type="text/something-not-javascript">
+// Vertex shader with an empty declaration inside struct should fail.
+// In-struct declarations have different grammar from declarations outside structs.
+struct S {
+    float, a;
+    float b;
+};
+
+void main() {
+    gl_Position = vec4(0.0);
+}
+</script>
+<script>
+"use strict";
+GLSLConformanceTester.runTests([
+    { vShaderId: 'vertexEmptyDeclaration',
+      vShaderSuccess: true,
+      linkSuccess: true,
+      passMsg: 'Vertex shader with an empty declaration should succeed'
+    },
+    { vShaderId: 'vertexEmptyDeclarationPlus',
+      vShaderSuccess: true,
+      linkSuccess: true,
+      passMsg: 'Vertex shader with an empty declaration followed by declarator should succeed'
+    },
+    { vShaderId: 'vertexEmptyStructDeclarationPlus',
+      vShaderSuccess: true,
+      linkSuccess: true,
+      passMsg: 'Vertex shader with an empty struct declaration followed by declarator should succeed'
+    },
+    { vShaderId: 'vertexEmptyDeclarationInStruct',
+      vShaderSuccess: false,
+      linkSuccess: false,
+      passMsg: 'Vertex shader with an empty declaration in a struct should fail'
+    },
+    { vShaderId: 'vertexEmptyDeclarationPlusInStruct',
+      vShaderSuccess: false,
+      linkSuccess: false,
+      passMsg: 'Vertex shader with an empty declaration followed by declarator in a struct should fail'
+    }
+]);
+
+var successfullyParsed = true;
+</script>
+</body>
+</html>