File: grid-container.html

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<!doctype html>
<title>CSS Container Queries Test: Grid container</title>
<link rel="help" href="https://drafts.csswg.org/css-contain-3/#size-container">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
  #grid {
    display: grid;
    container-type: inline-size;
    width: 400px;
    grid-template-columns: 1fr 1fr;
  }
  @container (width = 400px) {
    #grid div { color: green }
  }
</style>
<div id="grid">
  <div id="item1"></div>
  <div id="item2"></div>
</div>
<script>
  setup(() => assert_implements_container_queries());

  test(() => {
    assert_equals(getComputedStyle(item1).color, "rgb(0, 128, 0)");
    assert_equals(getComputedStyle(item2).color, "rgb(0, 128, 0)");
  }, "Check that grid items can query grid container");
</script>