1 files changed, 88 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/extra/canvas-compositing-test.html b/dom/canvas/test/webgl-conf/checkout/extra/canvas-compositing-test.html
new file mode 100644
index 0000000000..6eab0020bc
--- /dev/null
+++ b/dom/canvas/test/webgl-conf/checkout/extra/canvas-compositing-test.html
@@ -0,0 +1,88 @@
+<!--
+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>Canvas Compositing 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>
+Below are 2 50x50 pixel canvas but using CSS to display them at 100x100 pixels. <br/>
+They are solid black with a red triangle<br/>
+They each have a 10px CSS solid black border around them.<br/>
+Depending on how the browser composites the canvas with the page  they will get
+a white outline<hr/>
+<div>
+2d canvas<br/>
+<canvas id="example2" width="50" height="50" style="width: 100px; height: 100px; border: 10px solid black;"></canvas>
+</div>
+<hr/>
+3d canvas<br/>
+<div>
+<canvas id="example" width="50" height="50" style="width: 100px; height: 100px; border: 10px solid black;"></canvas>
+</div>
+<hr/>
+img tag<br/>
+<img src="50x50pixel-black-with-red-triangle.png" style="width: 100px; height: 100px; border: 10px solid black;"/>
+<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()
+        {
+            var wtu = WebGLTestUtils;
+            var canvas2d = document.getElementById("example2");
+            var ctx2d = canvas2d.getContext("2d");
+            ctx2d.fillStyle = "rgba(0, 0, 0, 255)"
+            ctx2d.fillRect(0, 0, 50, 50);
+            ctx2d.fillStyle = "rgba(255, 0, 0, 255)"
+            ctx2d.beginPath();
+            ctx2d.moveTo(25, 12.5);
+            ctx2d.lineTo(12.5, 37.5);
+            ctx2d.lineTo(37.5, 37.5);
+            ctx2d.lineTo(25, 12.5);
+            ctx2d.fill();
+
+
+            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);
+       }
+
+       init();
+       var successfullyParsed = true;
+    </script>
+</body>
+<script src="../js/js-test-post.js"></script>
+</body>
+</html>