css/css-grid/alignment/grid-alignment-implies-size-change-017.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Grid Layout Test: Changes on Default-Alignment may affect grid item's height</title>
<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
<link rel="help" href="https://drafts.csswg.org/css-grid-1/#column-align">
<link rel="help" href="https://drafts.csswg.org/css-grid-1/#grid-item-sizing">
<link rel="help" href="https://drafts.csswg.org/css-align-3/#propdef-align-items">
<link rel="help" href="https://drafts.csswg.org/css-align/#valdef-align-self-stretch">
<link rel="help" href="https://drafts.csswg.org/css-align/#valdef-align-self-normal">
<meta name="assert" content="Changing the grid item's align-items value from 'start' to 'stretch' causes replaced items to shrink.">
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<style>
.grid {
  position: relative;
  display: inline-grid;
  grid-template-columns: 100px;
  grid-template-rows: 80px;
  font: 20px/1 Ahem;
  background: grey;
  align-items: start;
}
#item {
  background: blue;
  align-self: auto;
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<script src="support/style-change.js"></script>
<script>
setup({ explicit_done: true });
function runTest() {
  evaluateStyleChangeMultiple('before', {
    item: {
      'data-expected-width': 100,
      'data-expected-height': 100,
    },
  });
  grid.style.alignItems = 'stretch';
  evaluateStyleChangeMultiple('after', {
    item: {
      'data-expected-width': 80,
      'data-expected-height': 80,
    },
  });
  done();
}
</script>
<body onload="document.fonts.ready.then(() => { runTest(); })">
<div class="grid" id="grid">
  <img id="item" src="support/100x100-green.png"></img>
</div>
</body>