composited-layer-bounds-with-composited-blur.html

<html>
<head>
    <!--
        This test verifies that a compositor-painted blur filter does not add filter outsets to
        the composited layer bounds.

        Note: Some platforms' compositors may not be capable of computing their own filter outsets
        yet, so they will need different expectations that include filter outsets in the composited
        layer bounds.
    -->
    <style>
        #composited {
            background-color: green;
            will-change: transform;
            filter: blur(25px);
            position: absolute;
            top: 100px;
            left: 100px;
            width: 100px;
            height: 100px;
        }
    </style>
</head>
<body>
    <div id="composited"></div>
    <pre id="console"></pre>
    <script>
        if (window.testRunner) {
            testRunner.dumpAsText();
            document.getElementById("console").appendChild(document.createTextNode(internals.layerTreeAsText(document)));
        }
    </script>
</body>
</html>

chromium/third_party/blink/web_tests/css3/filters/composited-layer-bounds-with-composited-blur.html