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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/uniforms/uniform-samplers-test.html b/dom/canvas/test/webgl-conf/checkout/conformance/uniforms/uniform-samplers-test.html
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+<!--
+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 sampler uniforms conformance 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>
+</head>
+<body>
+<canvas id="example" width="2" height="2" style="width: 40px; height: 40px;"></canvas>
+<div id="description"></div>
+<div id="console"></div>
+
+<script>
+"use strict";
+function init()
+{
+  description(
+      "Tests that only Uniform1i and Uniform1iv can be used to set" +
+      "sampler uniforms.");
+
+  var canvas2d = document.getElementById("canvas2d");
+
+  var wtu = WebGLTestUtils;
+  var gl = wtu.create3DContext("example");
+  var program = wtu.setupTexturedQuad(gl);
+
+  var textureLoc = gl.getUniformLocation(program, "tex");
+
+  gl.uniform1i(textureLoc, 1);
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR,
+      "uniform1i can set a sampler uniform");
+  gl.uniform1iv(textureLoc, [1]);
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR,
+      "uniform1iv can set a sampler uniform");
+  gl.uniform1f(textureLoc, 1);
+  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION,
+      "uniform1f returns INVALID_OPERATION if attempting to set a sampler uniform");
+  gl.uniform1fv(textureLoc, [1]);
+  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION,
+      "uniform1fv returns INVALID_OPERATION if attempting to set a sampler uniform");
+
+  var maxTextureUnits = gl.getParameter(gl.MAX_COMBINED_TEXTURE_IMAGE_UNITS);
+
+  var testUniformi = function() {
+    var success = true;
+    for (var ii = 0; ii < maxTextureUnits; ++ii) {
+      gl.uniform1i(textureLoc, ii);
+      success = success && (gl.getError() == gl.NO_ERROR);
+    }
+    expectTrue(success, "uniform1i works for any valid texture unit");
+  };
+
+  var testUniformiv = function() {
+    var success = true;
+    for (var ii = 0; ii < maxTextureUnits; ++ii) {
+      gl.uniform1iv(textureLoc, [ii]);
+      success = success && (gl.getError() == gl.NO_ERROR);
+    }
+    expectTrue(success, "uniform1iv works for any valid texture unit");
+  };
+
+  var steps = [
+    testUniformi,
+    testUniformiv,
+  ];
+
+  var generateInvalidUniformiTests = function(start, end) {
+    return function() {
+      var success = true;
+      for (var ii = start; ii < end; ++ii) {
+        gl.uniform1i(textureLoc, ii);
+        success = success && (gl.getError() == gl.INVALID_VALUE);
+      }
+      expectTrue(success, "uniform1i generates INVALID_VALUE for invalid texture units 0x" + start.toString(16) + " to 0x" + end.toString(16));
+    };
+  };
+
+  var generateInvalidUniformivTests = function(start, end) {
+    return function() {
+      var success = true;
+      for (var ii = start; ii < end; ++ii) {
+        gl.uniform1iv(textureLoc, [ii]);
+        success = success && (gl.getError() == gl.INVALID_VALUE);
+      }
+      expectTrue(success, "uniform1iv generates INVALID_VALUE for invalid texture units 0x" + start.toString(16) + " to 0x" + end.toString(16));
+    };
+  };
+
+  var step = 0x1000;
+  for (var ii = maxTextureUnits; ii < 0x10000; ii += step) {
+    steps.push(generateInvalidUniformiTests(ii, ii + step));
+    steps.push(generateInvalidUniformivTests(ii, ii + step));
+  }
+
+  steps.push(finishTest);
+  wtu.runSteps(steps);
+}
+
+init();
+var successfullyParsed = true;
+</script>
+</body>
+</html>