File: layer-stylesheet-multi-adoption.html

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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-cascade-5/#unnamed-layers">
<link rel="help" href="https://drafts.csswg.org/cssom/#dom-documentorshadowroot-adoptedstylesheets">
<link rel="help" href="https://issues.chromium.org/issues/462744687">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id=target>Test</div>
<script>
  test(() => {
    let a = new CSSStyleSheet();
    a.replaceSync(`@layer { div { color: green; } }`);
    let b = new CSSStyleSheet();
    b.replaceSync(`@layer { div { color: red; } }`);
    document.adoptedStyleSheets = [a, b, a];
    assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
  });
</script>