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|  | 1 <!DOCTYPE html> | 
|  | 2 <html> | 
|  | 3 <head> | 
|  | 4     <style> | 
|  | 5         body { | 
|  | 6             margin: 100px; | 
|  | 7             height: 3500px; | 
|  | 8             background-image: url('../../../compositing/resources/simple_image.p
    ng'); | 
|  | 9             background-size: 200px 200px; | 
|  | 10             background-attachment: fixed; | 
|  | 11             background-repeat: no-repeat; | 
|  | 12             background-position: bottom right; | 
|  | 13         } | 
|  | 14 | 
|  | 15         .test { | 
|  | 16             height: 400px; | 
|  | 17             width: 600px; | 
|  | 18             background-color: rgba(0, 0, 0, 0.5); | 
|  | 19             border: 20px solid orange; | 
|  | 20         } | 
|  | 21 | 
|  | 22         #layers { | 
|  | 23             opacity: 0; | 
|  | 24         } | 
|  | 25     </style> | 
|  | 26     <script> | 
|  | 27     if (window.testRunner) { | 
|  | 28         testRunner.dumpAsText(true); | 
|  | 29         window.internals.settings.setForceCompositingMode(true); | 
|  | 30         window.internals.settings.setAcceleratedCompositingForFixedRootBackgroun
    dEnabled(true); | 
|  | 31     } | 
|  | 32 | 
|  | 33     function doTest() | 
|  | 34     { | 
|  | 35         window.scrollTo(0, 200); | 
|  | 36 | 
|  | 37         if (window.internals) | 
|  | 38             document.getElementById('layers').innerText = internals.layerTreeAsT
    ext(document, internals.LAYER_TREE_INCLUDES_ROOT_LAYER); | 
|  | 39     } | 
|  | 40 | 
|  | 41     window.addEventListener('load', doTest, false); | 
|  | 42     </script> | 
|  | 43 </head> | 
|  | 44 <body> | 
|  | 45 | 
|  | 46     <div class="test"></div> | 
|  | 47 <pre id="layers"></pre> | 
|  | 48 </body> | 
|  | 49 </html> | 
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