46 lines
1.6 KiB
HTML
46 lines
1.6 KiB
HTML
<!DOCTYPE html>
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<title>Declarative Shadow DOM after attachShadow</title>
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<link rel='author' href='mailto:masonf@chromium.org'>
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<link rel='help' href='https://github.com/whatwg/dom/issues/831'>
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<script src='/resources/testharness.js'></script>
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<script src='/resources/testharnessreport.js'></script>
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<body>
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<script>
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let gotHost = false;
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function myObserver(mutationsList, observer) {
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for (let mutation of mutationsList) {
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for (let n of mutation.addedNodes) {
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if (n.id === 'host') {
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gotHost = true;
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const shadowRoot = n.attachShadow( {mode: 'closed'});
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assert_true(!!shadowRoot, 'Unable to attach shadow imperatively');
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}
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}
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}
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}
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const observer = new MutationObserver(myObserver);
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observer.observe(document.body, { childList: true, subtree: true });
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assert_false(gotHost, 'No mutations yet');
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</script>
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<div id=host>
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<!-- Ensure observer runs at this point (https://github.com/web-platform-tests/wpt/issues/35393) -->
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<script> // some content, which shouldn't be necessary </script>
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<template shadowrootmode=open>
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Content
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<slot>Fallback</slot>
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</template>
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</div>
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<script>
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test(t => {
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t.add_cleanup(function() { observer.disconnect(); });
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assert_true(gotHost);
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let host = document.querySelector('#host');
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let template = host.querySelector('template');
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assert_true(!!template, 'Declarative shadow attach should fail, so template should be left over');
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assert_true(!host.shadowRoot, 'Shadow root should be closed (from attachShadow call)');
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}, 'Declarative Shadow DOM: declarative shadow should fail if attachShadow() already called');
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</script>
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</body>
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