fcp-invisible-3d-rotate-descendant.html

<!DOCTYPE html>
<head>
<title>Performance Paint Timing Test: FCP due to 3d revealing of descendants</title>
<style>
    #main {
        width: 100px;
        height: 100px;
        left: 0px;
        position: relative;
        top: 0;
        transform: rotateX(45deg);
        transform-style: preserve-3d;
    }

    /*
       This tests that given multiplication effect of 3d transforms on bounding rect,
       An element counts as contentful/paintable only when its bounding rect is truly non-empty */
    #child {
        transform: rotateX(45deg);
    }

    /* contentful class is defined in test_fcp script. */
    #main.contentful {
        transform: none;
    }
</style>
</head>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../resources/utils.js"></script>
<div id="main">
    <div id="child">Text</div>
</div>
<script>
    test_fcp("First contentful paint fires due to its ancestor getting rotating into view.");
</script>
</body>
</html>

chromium/third_party/blink/web_tests/external/wpt/paint-timing/fcp-only/fcp-invisible-3d-rotate-descendant.html