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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/rendering/triangle.html b/dom/canvas/test/webgl-conf/checkout/conformance/rendering/triangle.html
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@@ -0,0 +1,73 @@
+<!--
+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>Rendering 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="50" height="50">
+There is supposed to be an example drawing here, but it's not important.
+</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">
+void main()
+{
+    gl_FragColor = vec4(1.0,0.0,0.0,1.0);
+}
+</script>
+
+<script>
+"use strict";
+function init()
+{
+    description(document.title);
+
+    var wtu = WebGLTestUtils;
+    var gl = wtu.create3DContext("example");
+    var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["vPosition"]);
+
+    var vertexObject = gl.createBuffer();
+    gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
+    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([ 0,0.5,0, -0.5,-0.5,0, 0.5,-0.5,0 ]), gl.STATIC_DRAW);
+    gl.enableVertexAttribArray(0);
+    gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);
+
+    gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
+    gl.drawArrays(gl.TRIANGLES, 0, 3);
+
+    // Test several locations
+    // First line should be all black
+    wtu.checkCanvasRect(gl, 0, 0, 50, 1, [0, 0, 0, 0]);
+
+    // Line 15 should be red for at least 10 red pixels starting 20 pixels in
+    wtu.checkCanvasRect(gl, 20, 15, 10, 1, [255, 0, 0, 255]);
+
+    // Last line should be all black
+    wtu.checkCanvasRect(gl, 0, 49, 50, 1, [0, 0, 0, 0]);
+}
+
+init();
+var successfullyParsed = true;
+</script>
+<script src="../../js/js-test-post.js"></script>
+
+</body>
+</html>