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28 lines
1.2 KiB
HTML
28 lines
1.2 KiB
HTML
<!DOCTYPE html>
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<meta charset="utf-8">
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<title>Adoptedstylesheets.concat should work when starting empty</title>
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<link rel="author" href="mailto:masonf@chromium.org">
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<link rel="help" href="https://drafts.csswg.org/cssom/#extensions-to-the-document-or-shadow-root-interface">
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<link rel="match" href="CSSStyleSheet-constructable-concat-ref.html">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<span>This should be green</span>
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<div id=host></div>
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<script>
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test(function() {
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const sheet = new CSSStyleSheet();
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sheet.replaceSync('span {background-color:green;}');
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assert_equals(document.adoptedStyleSheets.length,0);
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document.adoptedStyleSheets = document.adoptedStyleSheets.concat([sheet]);
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assert_equals(document.adoptedStyleSheets.length,1);
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const host = document.getElementById('host');
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const shadow = host.attachShadow({mode: 'open'});
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shadow.innerHTML = '<span>This should be green</span>';
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assert_equals(shadow.adoptedStyleSheets.length,0);
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shadow.adoptedStyleSheets = shadow.adoptedStyleSheets.concat([sheet]);
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assert_equals(shadow.adoptedStyleSheets.length,1);
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}, "adoptedStyleSheets should allow .concat on empty starting values");
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</script>
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