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<!DOCTYPE html>
<html>
  <head>
<meta charset="utf-8">
    <title>Canvas Compositing Test</title>
    <link rel="stylesheet" href="../resources/js-test-style.css"/>
    <script src="../resources/js-test-pre.js"></script>
    <script src="../conformance/resources/webgl-test.js"> </script>
    <script src="../conformance/resources/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(["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="../resources/js-test-post.js"></script>
</body>
</html>