Blitz - WPT: column-negative-margin-002.html

wpt / css / css-grid / grid-lanes / item-placement / column-negative-margin-002.html

/css/css-grid/grid-lanes/item-placement/column-negative-margin-002.html

<!DOCTYPE html>
<html>
<link rel="help" href="https://drafts.csswg.org/css-grid-3">
<link rel="match" href="column-negative-margin-002-ref.html">
<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
<style>
.grid-lanes {
    display: grid-lanes;
    flow-tolerance: 0;
    grid-template-columns: repeat(3, 50px);
}
</style>
<body>
  <p>If an item's negative margin is clamped to its own size, and it will never cause the running position to regress.</p>
  <div class="grid-lanes">
    <div style="background: aquamarine; height: 50px;" >
      item 1
    </div>
    <!-- This should have a running position of 0. -->
    <div style="background: lightsteelblue; height: 50px; margin-bottom: -60px; margin-top: -40px;" >
      item 2
    </div>
    <!-- This should be placed in track 2 because track 2 has a running position of 0 from item 2. -->
    <div style="background: aquamarine; grid-column: 2; height: 50px;" >
      item 3
    </div>
    <div style="background: lightblue; height: 30px;" >
      item 4
    </div>
    <div style="background: lightpink; height: 20px; margin-top: -50px;">
      item 5
    </div>
    <!-- This should visually be below item 4, because even though item 5 is placed high, the running position should not have regressed in the track. -->
    <div style="background: yellow; height: 20px;">
      item 6
    </div>
    <div style="background: orange; height: 40px; margin-top: -10px; margin-bottom: -30px;">
      item 7
    </div>
    <div style="background: lightblue; height: 20px;">
      item 8
    </div>
  </div>
</body>
</html>

/css/css-grid/grid-lanes/item-placement/column-negative-margin-002-ref.html

<!DOCTYPE html>
<html>
<style>
.grid {
    display: grid;
    grid-template-columns: repeat(3, 50px);
    grid-template-rows: repeat(2, 50px);
}
</style>
<body>
  <p>If an item's negative margin is clamped to its own size, and it will never cause the running position to regress.</p>
  <div class="grid">
    <div>
      <div style="background: aquamarine; height: 50px;" >
        item 1
      </div>
      <div style="background: orange; height: 40px; margin-top: -10px; margin-bottom: -30px;">
        item 7
      </div>
    </div>
    <div style="grid-column: 2;">
     <div style="background: lightsteelblue; height: 50px; margin-bottom: -10px; margin-top: -40px;" >
        item 2
      </div>
      <div style="background: aquamarine; height: 50px;" >
        item 3
      </div>
      <div style="background: lightblue; height: 20px;">
        item 8
      </div>
    </div>
    <div style="grid-column: 3;">
      <div style="background: lightpink; height: 20px; margin-top: -20px;">
        item 5
      </div>
      <div style="background: lightblue; height: 30px;" >
        item 4
      </div>
      <div style="background: yellow; height: 20px;">
        item 6
      </div>
    </div>
  </div>
</body>
</html>