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

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

/css/css-grid/grid-lanes/subgrid/grid-subgridded-to-grid-lanes/track-sizing/column-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="column-subgrid-extra-margin-009-ref.html">
<style>
.wrapper {
  width: 134px;
  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 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 width = 134px (4 columns of 33.5px each).

  This test exercises padding-left and column-gap overrides at each
  level of the chain:
    outer:           pad-L = 7,  pad-R = 3, column-gap = 10
    inner1, inner2:  pad-L = 10, pad-R = 3, column-gap = 15
    leaves:          pad-L = 7,  pad-R = 2, column-gap = 5

  The dominant leaf accumulates contributions from every level of
  the chain. On the start side: leaf's pad-L (7) + inner's pad-L
  (10) + outer's pad-L (7) = 24. On the end side: leaf's pad-R (2)
  + half of inner's own column-gap (15/2 = 7.5) = 9.5. The leaf's
  total margin contribution is 24 + 9.5 = 33.5.

  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 column it could land in. Every column
  therefore ends up at 33.5px:
    4 columns * 33.5px = 134px.
-->
  <div class="grid-lanes">
    <div class="subgrid" style="grid-column: span 4; gap: 20px 10px">
      <div class="subgrid" style="grid-column: span 2; padding-left: 10px; column-gap: 15px;">
        <div class="subgrid" style="padding-right: 2px; column-gap: 5px;"></div>
        <div class="subgrid" style="padding-right: 2px; column-gap: 5px;"></div>
        <div class="subgrid" style="padding-right: 2px; column-gap: 5px;"></div>
        <div class="subgrid" style="padding-right: 2px; column-gap: 5px;"></div>
        <div class="subgrid" style="padding-right: 2px; column-gap: 5px;"></div>
      </div>
      <div class="subgrid" style="grid-column: span 2; padding-left: 10px; column-gap: 15px;">
        <div class="subgrid" style="padding-right: 2px; column-gap: 5px;"></div>
        <div class="subgrid" style="padding-right: 2px; column-gap: 5px;"></div>
        <div class="subgrid" style="padding-right: 2px; column-gap: 5px;"></div>
        <div class="subgrid" style="padding-right: 2px; column-gap: 5px;"></div>
        <div class="subgrid" style="padding-right: 2px; column-gap: 5px;"></div>
      </div>
    </div>
  </div>
</div>
</body>
</html>

/css/css-grid/grid-lanes/subgrid/grid-subgridded-to-grid-lanes/track-sizing/column-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: 134px; height: 100px; background: green;"></div>
</html>