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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/sampler-array-struct-function-arg.html b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/sampler-array-struct-function-arg.html
new file mode 100644
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--- /dev/null
+++ b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/sampler-array-struct-function-arg.html
@@ -0,0 +1,72 @@
+<!--
+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 containing an array of samplers passed into a user-defined function</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>
+
+<canvas id="output" style="border: none;" width="64" height="64"></canvas>
+<div id="description"></div>
+<div id="console"></div>
+<script id="fshaderSampler" type="x-shader/x-fragment">
+precision mediump float;
+
+struct S {
+    sampler2D sam[2];
+};
+
+uniform S uni;
+
+vec4 useSampler(S arg)
+{
+    return texture2D(arg.sam[0], vec2(0.0, 0.0));
+}
+
+void main() {
+    gl_FragColor = vec4(useSampler(uni));
+}
+</script>
+<script type="application/javascript">
+"use strict";
+description();
+
+var wtu = WebGLTestUtils;
+var canvas = document.getElementById("output");
+var gl = wtu.create3DContext(canvas);
+
+if (!gl) {
+    testFailed("Could not create a GL context.");
+} else {
+    debug("Drawing with a shader that uses a sampler array in a struct passed into a function.");
+    var program = wtu.setupProgram(
+        gl, [wtu.simpleVertexShader, 'fshaderSampler'], ['a_position'], [0], true);
+    wtu.setupUnitQuad(gl);
+
+    var tex = gl.createTexture();
+    gl.bindTexture(gl.TEXTURE_2D, tex);
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
+    wtu.fillTexture(gl, tex, 1, 1, [0, 255, 0, 255]);
+
+    wtu.clearAndDrawUnitQuad(gl);
+    wtu.checkCanvas(gl, [0, 255, 0, 255], "should be green");
+}
+
+var successfullyParsed = true;
+</script>
+<script src="../../../js/js-test-post.js"></script>
+</body>
+</html>