Blitz - WPT: grid-items-percentage-margins-001.html

wpt / css / css-grid / grid-items / grid-items-percentage-margins-001.html

Data from commit:
708eb61 WPT runner: support mismatch reftests and multiple rel=match links (#665) (2026-08-09)

Subtest	Status	Message
.grid 1	PASS
.grid 2	PASS
.grid 3	PASS
.grid 4	PASS
.grid 5	PASS
.grid 6	PASS
.grid 7	PASS
.grid 8	PASS

Enable JavaScript in test iframe

/css/css-grid/grid-items/grid-items-percentage-margins-001.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Grid Layout Test: Grid items with percentage margins</title>
<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
<link rel="help" href="https://drafts.csswg.org/css-grid-1/#item-margins">
<meta name="assert" content="Checks grid items percentage margins are resolved against the inline size of their grid area (in a fixed size track).">
<link rel="stylesheet" href="/css/support/grid.css">
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<style>
.grid {
  font: 10px/1 Ahem;
  grid-template-columns: 100px;
  width: 500px;
  justify-items: start;
  position: relative;
}

.grid > div:nth-child(1) { background: cyan; }
.grid > div:nth-child(2) {
  background: magenta;
  width: 100%;
  height: 10px;
}

.marginLeft50Percent { margin-left: 50%; }
.marginRight50Percent { margin-right: 50%; }
.marginTop50Percent { margin-top: 50%; }
.marginBottom50Percent { margin-bottom: 50%; }
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<script type="text/javascript">
  setup({ explicit_done: true });
</script>

<body onload="document.fonts.ready.then(() => { checkLayout('.grid'); })">

<div id="log"></div>

<h3>Direction LTR</h3>

<pre>Item margin-left: 50%;</pre>

<div class="grid">
  <div class="marginLeft50Percent" data-expected-margin-left="50" data-offset-x="50" data-expected-width="10" data-expected-height="10">X</div>
  <div data-offset-x="0" data-offset-y="10" data-expected-width="100" data-expected-height="10"></div>
</div>

<pre>Item margin-right: 50%;</pre>

<div class="grid">
  <div class="marginRight50Percent" data-expected-margin-right="50" data-offset-x="0" data-expected-width="10" data-expected-height="10">X</div>
  <div data-offset-x="0" data-offset-y="10" data-expected-width="100" data-expected-height="10"></div>
</div>

<pre>Item margin-top: 50%;</pre>

<div class="grid">
  <div class="marginTop50Percent" data-expected-margin-top="50" data-offset-y="50" data-expected-width="10" data-expected-height="10">X</div>
  <div data-offset-x="0" data-offset-y="60" data-expected-width="100" data-expected-height="10"></div>
</div>

<pre>Item margin-bottom: 50%;</pre>

<div class="grid">
  <div class="marginBottom50Percent" data-expected-margin-bottom="50" data-offset-y="0" data-expected-width="10" data-expected-height="10">X</div>
  <div data-offset-x="0" data-offset-y="60" data-expected-width="100" data-expected-height="10"></div>
</div>

<h3>Direction RTL</h3>

<pre>Item margin-left: 50%;</pre>

<div class="grid directionRTL">
  <div class="marginLeft50Percent" data-expected-margin-left="50" data-offset-x="490" data-expected-width="10" data-expected-height="10">X</div>
  <div data-offset-x="400" data-offset-y="10" data-expected-width="100" data-expected-height="10"></div>
</div>

<pre>Item margin-right: 50%;</pre>

<div class="grid directionRTL">
  <div class="marginRight50Percent" data-expected-margin-right="50" data-offset-x="440" data-expected-width="10" data-expected-height="10">X</div>
  <div data-offset-x="400" data-offset-y="10" data-expected-width="100" data-expected-height="10"></div>
</div>

<pre>Item margin-top: 50%;</pre>

<div class="grid directionRTL">
  <div class="marginTop50Percent" data-expected-margin-top="50" data-offset-y="50" data-expected-width="10" data-expected-height="10">X</div>
  <div data-offset-x="400" data-offset-y="60" data-expected-width="100" data-expected-height="10"></div>
</div>

<pre>Item margin-bottom: 50%;</pre>

<div class="grid directionRTL">
  <div class="marginBottom50Percent" data-expected-margin-bottom="50" data-offset-y="0" data-expected-width="10" data-expected-height="10">X</div>
  <div data-offset-x="400" data-offset-y="60" data-expected-width="100" data-expected-height="10"></div>
</div>