<!DOCTYPE html>
<html>
<head>
<style>
.test-row {
    display: flex;
    margin-bottom: 5px;
}
.test-row > div {
    flex: none;
}

.container {
    margin-right: 5px;
    border: 5px solid lightgreen;
    width: 100px;
}

.horizontal-tb {
    writing-mode: horizontal-tb;
}

.vertical-rl {
    writing-mode: vertical-rl;
}

.vertical-lr {
    writing-mode: vertical-lr;
}

.row {
    flex-direction: row;
}

.row-reverse {
    flex-direction: row-reverse;
}

.column {
    flex-direction: column;
}

.column-reverse {
    flex-direction: column-reverse;
}

.flexbox {
    border: 0 solid pink;
    display: flex;
    height: 100px;
    width: 100px;
    overflow: auto;
}

.flexbox > div {
    width: 200px;
    height: 200px;
    background: -webkit-radial-gradient(center, ellipse cover, rgba(30,87,153,1) 0%,rgba(89,148,202,1) 62%,rgba(95,154,207,0.7) 68%,rgba(125,185,232,0) 100%);
    flex: none;
}

</style>
</head>
<body>
    <p>Scrollbars should work in all the flexboxes.</p>
</body>
<script>
var writingModes = ['horizontal-tb', 'vertical-rl', 'vertical-lr'];
var flexDirections = ['row', 'column', 'row-reverse', 'column-reverse'];
var testContents = '';
writingModes.forEach(function(writingMode) {
    testContents += "<div class='test-row'>";
    flexDirections.forEach(function(flexDirection) {
        var containerClass = 'container ' + writingMode;
        var flexboxClass = 'flexbox ' + flexDirection;
        testContents +=
            "<div class='" + containerClass + "'>" +
            "<div class='" + flexboxClass + "'>" +
            "<div></div>" +
            "</div>" +
            "</div>";
    });
    testContents += "</div>";
});

document.body.innerHTML += testContents;

</script>
</body>
</html>