<!DOCTYPE html>
<html>
<head>
    <title>Tests that overlap testing continues to work after a layer converts from shared to composited</title>
    <style>
        .trigger {
            position: absolute;
            transform: translateZ(0);
            background-color: silver;
            width: 20px;
            height: 400px;
        }
        
        .provider {
            position: absolute;
            left: 20px;
            top: 20px;
            width: 400px;
            height: 100px;
            background-color: gray;
        }

        .box {
            width: 100px;
            height: 100px;
            background-color: gray;
        }
        
        .absolute {
            position: absolute;
            top: 200px;
            left: 0px;
            background-color: lightblue;
        }
        
        .overlapper {
            position: absolute;
            top: 70px;
            left: 150px;
            width: 200px;
            height: 100px;
            padding: 10px;
            background-color: green;
        }
        
        .stacking {
            position: relative;
            z-index: 0;
            padding: 10px;
            height: 120px;
            border: 1px solid black;
        }
        
        .negative {
            position: relative;
            z-index: -1;
            background-color: orange;
        }
        
        .negative.changed {
            transform: translateZ(0);
        }
        
    </style>
    <script>
        if (window.testRunner)
            testRunner.waitUntilDone();
        
        window.addEventListener('load', () => {
            setTimeout(() => {
                document.querySelector('.negative').classList.add('changed');
                if (window.testRunner)
                    testRunner.notifyDone();
            }, 0);
        }, false);
    </script>
</head>
<body>
    <div class="trigger"></div>
    <div class="provider">
        <div class="absolute box"></div>
        <div class="stacking box">
            <div class="negative box"></div>
        </div>
    </div>
    <div class="overlapper"></div>
</body>
</html>