css/css-grid/grid-items/grid-minimum-size-grid-items-015.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Grid Layout Test: Minimum size of grid items</title>
<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
<link rel="help" href="http://www.w3.org/TR/css-grid-1/#min-size-auto" title="6.5. Implied Minimum Size of Grid Items">
<link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
<meta name="assert" content="Checks that automatic minimum size is not clamped if the grid item if it spans some not fixed grid tracks.">
<style>
#reference-overlapped-red {
    position: absolute;
    background-color: red;
    width: 100px;
    height: 100px;
    z-index: -1;
}

#constrained-grid {
    display: grid;
    grid: 10px auto 10px / 10px auto 10px;
    justify-content: start;
}

#test-grid-item-overlapping-green {
    background-color: green;
    grid-row: span 3;
    grid-column: span 3;
}

#content-100x100 {
    width: 100px;
    height: 100px;
}
</style>

<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>

<div id="reference-overlapped-red"></div>
<div id="constrained-grid">
    <div id="test-grid-item-overlapping-green">
        <div id="content-100x100"></div>
    </div>
</div>