css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-explicit-block.html

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>CSS Grid Test: Verify definite blocks effect track-sizing algorithm.</title>
    <link rel="author" title="Brandon Stewart" href="mailto:brandonstewart@apple.com">
    <link rel="help" href="https://drafts.csswg.org/css-grid-3/#track-sizing">
    <link rel="match" href="masonry-track-sizing-explicit-block-ref.html">
</head>

<body>
<style>
    grid {
        display: grid;
        grid-template-columns: 100px 1fr;
        grid-template-rows: masonry;
        width: 300px;
        height: 100px;
    }

    box1 {
        height: 50px;
        width: 30px;
        background-color: blue;
    }

    box2 {
        height: 50px;
        background-color: red;
    }

    box3 {
        height: 50px;
        width: 100px;
        background-color: purple;
    }

    box4 {
        height: 50px;
        background-color: green;
    }

</style>

<grid>
    <box1>1</box1>
    <box2>2</box2>
    <box3>3</box3>
    <box4>4</box4>
</grid>

</body>
</html>