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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-grid/grid-lanes/subgrid/grid-subgridded-to-grid-lanes/track-sizing/column-subgrid-extra-margin-007.html - WPT Dashboard Interop Dashboard
<!DOCTYPE HTML>
<html>
<meta charset="utf-8">
<title>CSS Grid Lanes Test: Subgrid with no grid items accommodates gutter size and padding</title>
<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
<link rel="match" href="column-subgrid-extra-margin-006-ref.html">
<style>
.wrapper {
width: 116px;
height: 100px;
background: red;
}
.grid-lanes {
display: inline-grid-lanes;
grid-template-columns: repeat(4, auto);
background: red;
}
.subgrid {
display: grid;
grid-template: auto / subgrid;
background: green;
padding: 11px 7px 9px 3px;
}
</style>
</head>
<body>
<p>Test passes if there is a filled green rectangle and <strong>no red</strong>.</p>
<div class="wrapper">
<!--
Grid lanes container width = 116px (4 columns of 29px each).
Same nested structure as -006 but with pad-L and pad-R swapped
(pad-L = 3, pad-R = 7). The dominant leaf is the mirror leaf:
leaf's pad-R (7) + inner's pad-R (7) + outer's pad-R (7) on the
end side, plus the leaf's pad-L (3) and half of outer's
column-gap (10/2 = 5) on the start side, for a total of 29.
Per the WG resolution at
container every subgrid in an auto-placed chain must accommodate
its margin contribution at every column it could land in. Because the
dominant leaf's total is invariant under pad-L/pad-R swap (the
chain is symmetric), this test produces the same uniform per-track
size as -006:
4 columns * 29px = 116px.
-->
<div class="grid-lanes">
<div class="subgrid" style="grid-column: span 4; gap: 20px 10px">
<div class="subgrid" style="grid-column: span 2;">
<div class="subgrid"></div>
<div class="subgrid"></div>
<div class="subgrid"></div>
<div class="subgrid"></div>
<div class="subgrid"></div>
</div>
<div class="subgrid" style="grid-column: span 2;">
<div class="subgrid"></div>
<div class="subgrid"></div>
<div class="subgrid"></div>
<div class="subgrid"></div>
<div class="subgrid"></div>
</div>
</div>
</div>
</div>
</body>
</html>