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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/sampler-array-using-loop-index.html b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/sampler-array-using-loop-index.html
new file mode 100644
index 0000000000..c5707a1f89
--- /dev/null
+++ b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/sampler-array-using-loop-index.html
@@ -0,0 +1,81 @@
+<!--
+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>Sampler arrays using loop index should compile fine.</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>
+</head>
+<body>
+<canvas id="example" width="4" height="4" style="width: 40px; height: 30px;"></canvas>
+<div id="description"></div>
+<div id="console"></div>
+<script id="vshader" type="x-shader/x-vertex">
+attribute vec4 vPosition;
+void main()
+{
+  gl_Position = vPosition;
+}
+</script>
+
+<script id="fshader" type="x-shader/x-fragment">
+precision mediump float;
+uniform sampler2D uni[2];
+
+float zero(int x)
+{
+  return float(x) - float(x);
+}
+
+void main()
+{
+  vec4 c = vec4(0,0,0,0);
+  for (int ii = 1; ii < 3; ++ii) {
+    if (c.x > 255.0) {
+      c.x = 255.0 + zero(ii);
+      break;
+    }
+    c += texture2D(uni[ii - 1], vec2(0.5, 0.5));
+  }
+  gl_FragColor = c;
+}
+</script>
+<script>
+"use strict";
+description(document.title);
+var wtu = WebGLTestUtils;
+var gl = wtu.create3DContext("example");
+var program = wtu.setupTexturedQuad(gl);
+
+//------------------------------------------------------------------------------
+var program = wtu.setupProgram(
+    gl, ['vshader', 'fshader'], ['vPosition'], undefined, true);
+
+for (var ii = 0; ii < 2; ++ii) {
+  var loc = gl.getUniformLocation(program, "uni[" + ii + "]");
+  gl.activeTexture(gl.TEXTURE0 + ii);
+  var tex = gl.createTexture();
+  wtu.fillTexture(gl, tex, 1, 1, [32, 16, 8, ii * 9], 0);
+  gl.uniform1i(loc, ii);
+}
+
+wtu.clearAndDrawUnitQuad(gl);
+wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors from setup.");
+wtu.checkCanvas(gl, [64, 32, 16, 9],
+                "Should render correctly", 1);
+
+var successfullyParsed = true;
+
+</script>
+<script src="../../../js/js-test-post.js"></script>
+
+</body>
+</html>
+