File: query-container-name.html

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<!DOCTYPE html>
<title>@container: query container name, no query part</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#container-rule">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
  #inner { container-name: --foo }
  #outer { container-name: --bar }
  #target {
    --match-foo: no;
    --match-bar: no;
    --match-baz: no;
  }
  @container --foo { #target { --match-foo: yes; } }
  @container --bar { #target { --match-bar: yes; } }
  @container --baz { #target { --match-baz: yes; } }
</style>
<div id="outer">
    <div id="inner">
      <div id="target"></div>
    </div>
  </div>
</div>
<script>
  test(() => {
    assert_equals(getComputedStyle(target).getPropertyValue("--match-foo"), "yes");
  }, "match closest named container");

  test(() => {
    assert_equals(getComputedStyle(target).getPropertyValue("--match-bar"), "yes");
  }, "match ancestor named container");

  test(() => {
    assert_equals(getComputedStyle(target).getPropertyValue("--match-baz"), "no");
  }, "no match for unused container name");
</script>