Blitz - WPT: column-subgrid-extra-margin-007.html

wpt / css / css-grid / grid-lanes / subgrid / grid-subgridded-to-grid-lanes / track-sizing / column-subgrid-extra-margin-007.html

/css/css-grid/grid-lanes/subgrid/grid-subgridded-to-grid-lanes/track-sizing/column-subgrid-extra-margin-007.html

<!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="help" href="https://drafts.csswg.org/css-grid-3/#subgrids">
<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
  https://github.com/w3c/csswg-drafts/issues/10926, in a grid-lanes
  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>

/css/css-grid/grid-lanes/subgrid/grid-subgridded-to-grid-lanes/track-sizing/column-subgrid-extra-margin-006-ref.html

<!DOCTYPE HTML>
<html>
<meta charset="utf-8">
<p>Test passes if there is a filled green rectangle and <strong>no red</strong>.</p>
<div style="width: 116px; height: 100px; background: green;"></div>
</html>