<!DOCTYPE html>
<html>
<head>
    <title>Snap points - nested snap coordinates</title>
    <style>
        #container {
            position: absolute;
            width: 300px;
            height: 300px;
            top: 100px;
            left: 100px;
        }

        .scrollable {
            overflow: scroll;
            -webkit-overflow-scrolling: touch;
            height: 300px;
            margin: 0 10px;
        }

        ::-webkit-scrollbar {
            display: none;
        }
    
        .center-snap-receiver {
            scroll-snap-type: y mandatory;
        }
    
        .snap-point-marker {
            margin-top: 100px;
            width: 15px;
            height: 15px;
        }

        .snap-point-start {
            scroll-snap-align: start;
            background-color: red;
            opacity: 0.5;
        }

        .snap-point-center {
            scroll-snap-align: center;
            background-color: green;
            opacity: 0.5;
        }

        .snap-point-end {
            scroll-snap-align: end;
            background-color: blue;
            opacity: 0.5;
        }

        .large-content {
            height: 3000px;
            width: 100%;
        }
    
        .small-content {
            height: 200px;
            width: 100%;
        }

        .invalidContainer {
            background-color: black;
            opacity: 0.1;
            height: 300px;
            margin: 0 10px;
            opacity: 0.5;
            overflow: hidden;
        }

        #alignment-marker-box {
            position: absolute;
            top: 0;
            left: 0;
            width: 300px;
            height: 300px;
            top: 100px;
            left: 100px;
            z-index: -1;
            margin: 0 10px;
        }

        .alignment-marker {
            position: absolute;
            width: 100%;
            height: 1px;
        }
    </style>
        <script src="../../resources/js-test.js"></script>
        <script>
        function runTest()
        {
            var container = document.getElementById('container');
            debug("Scroll-snap offsets for 'container': " + window.internals.scrollSnapOffsets(container));

            finishJSTest();
        }

        function onLoad()
        {
            jsTestIsAsync = true;
            if (window.testRunner)
                setTimeout(runTest, 0);
        }
        </script>
</head>
<body onload="onLoad();">
    <div id="container" class="center-snap-receiver scrollable">
        <div id="snap-child-1" class="snap-point-start snap-point-marker"></div>
        <div class="nested">
            <div id="snap-child-2" class="snap-point-center snap-point-marker"></div>
        </div>
        <div class="nested">
            <div class="nested">
                <div id="snap-child-3" class="snap-point-start snap-point-marker"></div>
            </div>
        </div>
        <div id="snap-child-4" class="snap-point-start snap-point-marker"></div>
        <div id="snap-child-5" class="snap-point-start snap-point-marker"></div>
        <div class="nested">
            <div id="snap-child-6" class="snap-point-start snap-point-marker"></div>
        </div>
        <div id="snap-child-7" class="snap-point-start snap-point-marker"></div>
        <div class="nested">
            <div id="snap-child-8" class="snap-point-center snap-point-marker"></div>
        </div>
        <div id="snap-child-9" class="snap-point-start snap-point-marker"></div>
        <div id="snap-child-10" class="snap-point-center snap-point-marker"></div>
        <div class="nested">
            <div id="snap-child-11" class="snap-point-start snap-point-marker"></div>
        </div>
         <div id="snap-child-12" class="snap-point-start snap-point-marker"></div>
        <div class="nested">
            <div id="snap-child-13" class="snap-point-start snap-point-marker"></div>
        </div>
        <div class="nested">
            <div class="nested">
                <div id="snap-child-14" class="snap-point-end snap-point-marker"></div>
            </div>
        </div>
        <div id="snap-child-15" class="snap-point-end snap-point-marker"></div>
        <div class="large-content"></div>
    </div>
    <div id="alignment-marker-box">
        <div style="border-bottom: 2px red solid;" class="alignment-marker"></div>
        <div style="border-bottom: 2px green solid; top: 150px;" class="alignment-marker"></div>
        <div style="border-bottom: 2px blue solid; top: 300px;" class="alignment-marker"></div>
    </div>
</body>
</html>