Blitz - WPT: row-subgrid-extra-margin-009.html

wpt / css / css-grid / grid-lanes / subgrid / grid-subgridded-to-grid-lanes / track-sizing / row-subgrid-extra-margin-009.html

/css/css-grid/grid-lanes/subgrid/grid-subgridded-to-grid-lanes/track-sizing/row-subgrid-extra-margin-009.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="row-subgrid-extra-margin-009-ref.html">
<style>
.wrapper {
  width: 110px;
  height: 83px;
  background: red;
}
.grid-lanes {
  display: inline-grid-lanes;
  grid-template-rows: repeat(2, auto);
  background: red;
}
.subgrid {
  display: grid;
  grid-template: subgrid / auto;
  grid-template-columns: auto auto auto;
  background: green;
  padding: 11px 3px 9px 7px;
}
</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 height = 83px (2 rows of 41.5px each).

  This test exercises padding-top and row-gap overrides at each
  level of the chain:
    outer:           pad-T = 11, pad-B = 9, row-gap = 20
    inner1, inner2:  pad-T = 10, pad-B = 9, row-gap = 15
    leaves:          pad-T = 11, pad-B = 2, row-gap = 5

  The dominant leaf accumulates contributions from every level of
  the chain. On the start side: leaf's pad-T (11) + inner's pad-T
  (10) + outer's pad-T (11) = 32. On the end side: leaf's pad-B (2)
  + half of inner's own row-gap (15/2 = 7.5) = 9.5. The leaf's
  total margin contribution is 32 + 9.5 = 41.5.

  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 row it could land in. Both rows
  therefore end up at 41.5px:
    2 rows * 41.5px = 83px.
-->
  <div class="grid-lanes">
    <div class="subgrid" style="grid-row: span 2; gap: 20px 10px">
      <div class="subgrid" style="grid-row: span 2; padding-top: 10px; row-gap: 15px;">
        <div class="subgrid" style="padding-bottom: 2px; row-gap: 5px;"></div>
        <div class="subgrid" style="padding-bottom: 2px; row-gap: 5px;"></div>
        <div class="subgrid" style="padding-bottom: 2px; row-gap: 5px;"></div>
        <div class="subgrid" style="padding-bottom: 2px; row-gap: 5px;"></div>
      </div>
      <div class="subgrid" style="grid-row: span 2; padding-top: 10px; row-gap: 15px;">
        <div class="subgrid" style="padding-bottom: 2px; row-gap: 5px;"></div>
        <div class="subgrid" style="padding-bottom: 2px; row-gap: 5px;"></div>
        <div class="subgrid" style="padding-bottom: 2px; row-gap: 5px;"></div>
        <div class="subgrid" style="padding-bottom: 2px; row-gap: 5px;"></div>
      </div>
    </div>
  </div>
</div>
</body>
</html>

/css/css-grid/grid-lanes/subgrid/grid-subgridded-to-grid-lanes/track-sizing/row-subgrid-extra-margin-009-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: 110px; height: 83px; background: green;"></div>
</html>