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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/struct-with-single-member-constructor.html b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/struct-with-single-member-constructor.html
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/struct-with-single-member-constructor.html
@@ -0,0 +1,52 @@
+<!--
+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 struct with a single member constructor test</title>
+<link rel="stylesheet" href="../../../resources/js-test-style.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="fshader" type="x-shader/x-fragment">
+#version 100
+
+precision mediump float;
+
+struct S {
+    mat2 rotation;
+};
+void main(void)
+{
+    float angle = 1.0;
+    S(mat2(1.0, angle, 1.0, 1.0));
+}
+</script>
+<script>
+"use strict";
+description();
+debug("This is a regression test for <a href='https://bugs.chromium.org/p/swiftshader/issues/detail?id=56'>Swiftshader bug 56</a>.");
+debug("");
+
+GLSLConformanceTester.runTests([
+{
+  fShaderId: 'fshader',
+  fShaderSuccess: true,
+  linkSuccess: true,
+  passMsg: "Construct a struct with a single matrix member"
+}
+]);
+
+</script>
+
+</body>
+</html>