| <!DOCTYPE> |
| <html> |
| <head> |
| <!-- Check for compositing WebGL layer and accelerated background-color layer. --> |
| <!-- On load, there is not WebGL layer. WebGL layer is created on the fly. --> |
| <style> |
| #background { |
| width: 200px; |
| height: 200px; |
| display: block; |
| } |
| #canvas { |
| width: 200px; |
| height: 200px; |
| display: block; |
| } |
| .blue { |
| width: 50px; |
| height: 50px; |
| background-color: rgba(0, 0, 255, 0.5); |
| display: block; |
| top: -50px; |
| position: relative; |
| } |
| .composited { |
| will-change: transform; |
| } |
| </style> |
| <script type="text/javascript" charset="utf-8"> |
| if (window.testRunner) |
| testRunner.waitUntilDone(); |
| |
| function doTest() |
| { |
| window.setTimeout(function() { |
| makeWebGLLayer(); |
| if (window.internals) |
| internals.forceCompositingUpdate(document); |
| if (window.testRunner) { |
| window.setTimeout(function() { |
| testRunner.notifyDone(); |
| }, 0); |
| } |
| }, 0); |
| } |
| |
| function initWebGL(vshader, fshader, attribs, clearColor, clearDepth) |
| { |
| var canvas = document.getElementById('canvas'); |
| var gl = canvas.getContext("webgl"); |
| if (!gl) { |
| alert("No WebGL context found"); |
| return null; |
| } |
| |
| gl.clearColor(clearColor[0], clearColor[1], clearColor[2], clearColor[3]); |
| gl.clearDepth(clearDepth); |
| |
| gl.enable(gl.DEPTH_TEST); |
| gl.enable(gl.BLEND); |
| gl.blendFunc(gl.SRC_ALPHA, gl.ONE); |
| |
| return gl; |
| } |
| |
| function makeWebGLLayer() |
| { |
| var gl = initWebGL("", "", [], [ 1.0, 0.0, 0.0, 1.0 ], 1); |
| gl.viewport(0, 0, 200, 200); |
| gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT); |
| } |
| |
| window.addEventListener('load', doTest, false); |
| </script> |
| </head> |
| <body> |
| <div id="background"> |
| <canvas id="canvas"></canvas> |
| <div class="blue composited"></div> |
| </div> |
| </body> |
| </html> |
