<!DOCTYPE html>
<html>
<head>
<title>This tests that backdrop filter with mask works properly.</title>
<style>
.container {
    width: 200px;
    height: 200px;
}
.inner {
    -webkit-backdrop-filter: invert(1); 
	border: 10px solid green;
    width: 100px;
    height: 100px;
	-webkit-mask-image: linear-gradient(black, transparent);
}
</style>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();

    function dumpLayers() {
        if (window.internals)
            document.getElementById('result').innerText = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_CONTENT_LAYERS)
    }
    window.addEventListener('load', dumpLayers, false);
</script>
</head>
<body>
<div class=container>foo<div class=inner>bar</div></div>
<pre id=result></pre>
</body>
</html>