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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/buffers/buffer-uninitialized.html b/dom/canvas/test/webgl-conf/checkout/conformance/buffers/buffer-uninitialized.html
new file mode 100644
index 0000000000..75282f3674
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance/buffers/buffer-uninitialized.html
@@ -0,0 +1,104 @@
+<!--
+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">
+<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>
+<div id="description"></div>
+<div id="console"></div>
+
+<canvas id="canvas" width="1" height="1"></canvas>
+
+<script id="vshader" type="x-shader/x-vertex">
+attribute float a_vertex;
+void main()
+{
+    gl_Position = a_vertex == 0.0 ? vec4(9, 9, 9, 1) : vec4(0.5, 0.5, 0.5, 1);
+}
+</script>
+
+<script id="fshader" type="x-shader/x-fragment">
+void main()
+{
+    gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
+}
+</script>
+
+<script>
+"use strict";
+description("Tests that uninitialized WebGLBuffers are zeroed out");
+
+var wtu = WebGLTestUtils;
+var gl = wtu.create3DContext(document.getElementById("canvas"));
+var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["a_vertex"]);
+shouldBeTrue("program != null");
+
+var TEST_LENGTH = 1024;
+var TEST_BUFSIZE = TEST_LENGTH * 4;
+var data = new Float32Array(TEST_LENGTH / 4); // this array is zeroed
+
+var indices = new Uint16Array(TEST_LENGTH);
+for (var i = 0; i < TEST_LENGTH; i++) {
+  indices[i] = i;
+}
+
+gl.clearColor(0, 1, 0, 1);
+
+function test(initFunction) {
+  var uninitializedBuffer = gl.createBuffer();
+  gl.bindBuffer(gl.ARRAY_BUFFER, uninitializedBuffer);
+  initFunction();
+
+  var elements = gl.createBuffer();
+  gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, elements);
+  gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW);
+
+  gl.useProgram(program);
+  var vertexLoc = gl.getAttribLocation(program, "a_vertex");
+  gl.vertexAttribPointer(vertexLoc, 1, gl.FLOAT, gl.FALSE, 0, 0);
+  gl.enableVertexAttribArray(vertexLoc);
+
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "no error should result from setup");
+
+  gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
+  gl.drawElements(gl.POINTS, TEST_LENGTH, gl.UNSIGNED_SHORT, 0);
+  wtu.checkCanvasRect(gl, 0, 0, 1, 1, [0, 255, 0, 255], "buffer should be initialized to zero");
+
+  gl.deleteBuffer(uninitializedBuffer);
+}
+
+var REPETITIONS = 50;
+
+var j;
+debug("");
+debug("testing bufferData(..., size, ...)");
+for (j = 0; j < REPETITIONS; j++) {
+  test(function() {
+    gl.bufferData(gl.ARRAY_BUFFER, TEST_BUFSIZE, gl.STATIC_DRAW);
+  });
+}
+
+debug("");
+debug("testing bufferSubData(..., offset, data) of uninitialized buffer");
+for (j = 0; j < REPETITIONS; j++) {
+  test(function() {
+    gl.bufferData(gl.ARRAY_BUFFER, TEST_BUFSIZE, gl.STATIC_DRAW);
+    // bufferSubData the second quarter of the buffer
+    gl.bufferSubData(gl.ARRAY_BUFFER, TEST_BUFSIZE / 4, data);
+  });
+}
+
+var successfullyParsed = true;
+</script>
+
+<script src="../../js/js-test-post.js"></script>
+</body>
+</html>