wpt / css / css-grid / grid-extrinsically-sized-mutations.html

Status: PASS | Duration: 57ms | Subtests: 8/8 | Open test on wpt.live | wpt.fyi

TestTest SourceSubtests (8/8)

Data from commit:
1884860 Copy-on-write style attribute blocks that are in the rule tree (#831) (2026-09-02)

SubtestStatusMessage
grid-extrinsically-sized-mutationsPASS
grid-extrinsically-sized-mutations 1PASS
grid-extrinsically-sized-mutations 2PASS
grid-extrinsically-sized-mutations 3PASS
grid-extrinsically-sized-mutations 4PASS
grid-extrinsically-sized-mutations 5PASS
grid-extrinsically-sized-mutations 6PASS
grid-extrinsically-sized-mutations 7PASS

/css/css-grid/grid-extrinsically-sized-mutations.html

<!DOCTYPE html>
<html>
<head>
<link rel="author" title="Sammy Gill" href="mailto:sammy.gill@apple.com">
<link rel="help" href="https://drafts.csswg.org/css-grid-2/#layout-algorithm">
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
<meta name="assert" content="Tests that an extrinsically sized grid responds to various changes to both the grid and its constraints.">
<style>
.container {
  width: 50px;
}
.grid {
  display: grid;
  grid-template-columns: 100%;
  grid-template-rows: 50px;
  height: 50px;
  outline: 1px solid blue;
  font: 10px/1 Ahem;
}

.alignStart {
  align-items: start;
}

.fixedHeight {
  height: 100px;
}

.percentHeight {
  height: 100%;
}

.percentRow {
  grid-template-rows: 100%;
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
function mutateContent() {
  document.getElementById("one").style.width = "10px";
  document.getElementById("two").style.alignItems = "stretch";
  document.getElementById("three").style.gridTemplateRows = "30px";
  document.getElementById("four").style.height = "10px";
  document.getElementById("five").innerHTML += " x x x x x x";
  document.getElementById("six").style.height = "50px";
  document.getElementById("seven").style.gridTemplateColumns = "20%";

  document.getElementById("eight").innerHTML += "<div class='test' data-expected-height='40'>x x x x</div>";
}
</script>
</head>
<body>

<!-- Inline constraint on the grid changes -->
<div class="container" id="one">
  <div class="grid alignStart">
    <div class="test" data-expected-height="40">x x x x</div>
  </div>
</div>

<!-- Alignment of grid items changes -->
<div class="container">
  <div id="two" class="grid alignStart">
    <div class="test" data-expected-height="50">x x x</div>
  </div>
</div>

<!-- grid-template-rows changes to different fixed size. -->
<div id="three" class="grid">
  <div class="test" data-expected-height="30">xx</div>
</div>

<!-- Grid block size changes with % based rows -->
<div id="four" class="grid percentRow">
  <div class="test" data-expected-height="10">xx</div>
</div>

<!-- Grid item content changes -->
<div class="container">
  <div class="grid alignStart">
    <div id="five" class="test" data-expected-height="30">x x x</div>
  </div>
</div>

<!-- Grid with % height and rows has fixed block constraint changed -->
<div class="container fixedHeight" id="six">
  <div class="grid percentRow percentHeight">
    <div class="test" data-expected-height="50">xx</div>
  </div>
</div>

<!-- grid-template-columns changes to different % value -->
<div class="container">
  <div id="seven" class="grid alignStart">
    <div class="test" data-expected-height="30">x x x</div>
  </div>
</div>

<!-- Grid has new item added -->
<div class="container">
  <div id="eight" class="grid alignStart" style="grid-template-columns: 50% 50%;">
    <div>xx xx</div>
  </div>
</div>
</body>
<script>
setup({ explicit_done: true });
document.fonts.ready.then(() => {
  document.body.offsetHeight;
  mutateContent();
  document.body.offsetHeight;

  let tests = document.querySelectorAll(".test");
  tests.forEach((element) => {
    test(function() {
      let expectedHeight = element.getAttribute("data-expected-height");
      assert_equals(element.offsetHeight, Number(expectedHeight), "height");
    });
  });
  done();
})
</script>
</html>