File: contain-layout-baseline-003.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Containment Test: Layout containment supress baseline in grid items</title>
<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
<link rel="help" href="https://drafts.csswg.org/css-contain-1/#containment-layout">
<link rel="help" href="https://drafts.csswg.org/css-grid-1/#grid-baselines">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<meta name=assert content="Grid items with layout containment are treated as having no baseline, for that reason their baseline is synthesized from the grid item's border box when they're baseline aligned.">
<style>
#grid {
  display: inline-grid;
  align-items: baseline;
  background: red;
  grid-auto-flow: column;
}

canvas {
  background: green;
  width: 50px;
  height: 100px;
}

#item {
  contain: layout;
  color: transparent;
  background: green;
  width: 50px;
  height: 100px;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div id="grid">
  <canvas></canvas>
  <div id="item">item</div>
</div>