View All Attachments for Bug 197611

Attachment #369122
video	video/mp4	2019-05-06 06:36:59 PDT	2.06 MB	no flags	Details

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Attachment #369655
Testcase	text/html	2019-05-11 11:47:30 PDT	1.62 KB	no flags	Details

<!DOCTYPE html> <!-- webkit-test-runner [ internal:AsyncOverflowScrollingEnabled=true ] -->
<html>
<head>
    <title>Tests that the sharing layer still has backing store and paints shared layers after a tree config change</title>
    <style>
        .clipping {
            position: absolute;
            top: 20px;
            left: 20px;
            overflow: hidden;
            height: 300px;
            width: 300px;
            margin: 10px;
            background-color: silver;
        }
        
        .clipping.changed {
            background: none;
        }
        
        .sharing {
            margin: 20px;
            width: 150px;
            height: 130px;
            background-color: green;
            opacity: 0.75;
        }
    
        .spacer {
            height: 500px;
            width: 20px;
            background-color: silver;
        }
        
        .spacer.changed {
            height: 100px;
        }

        .trigger {
            transform: translateZ(0);
            width: 50px;
            height: 50px;
            background-color: silver;
        }
    </style>
    <script>
        if (window.testRunner)
            testRunner.waitUntilDone();

        window.addEventListener('load', () => {
            setTimeout(() => {
                document.querySelector('.clipping').classList.add('changed');
                if (window.testRunner)
                    testRunner.notifyDone();
            }, 2000);
        }, false);
    </script>
</head>
<body>
    <div class="composited trigger"></div>
    <div class="clipping">adf
        <!-- <div class="sharing"></div> -->
    </div>
</body>
</html>