35 lines
1.4 KiB
HTML
35 lines
1.4 KiB
HTML
<!DOCTYPE html>
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<title>Imperative Slot API: fallback should be cleared after slot assignment</title>
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<link rel="author" href="mailto:xiaochengh@chromium.org">
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<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1292292">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<div>
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<div id="host1"><span></span></div>
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<div id="host2"><span></span></div>
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</div>
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<script>
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test(() => {
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const host = document.getElementById('host1');
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const shadow = host.attachShadow({mode: 'open', slotAssignment: 'manual'});
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shadow.innerHTML = '<slot>fallback</slot>';
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host.offsetHeight; // Force layout
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const slot = shadow.firstChild;
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slot.assign(host.firstChild);
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assert_array_equals(slot.assignedNodes(), [host.firstChild]);
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assert_equals(host.offsetHeight, 0, 'Fallback content should not be rendered');
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}, 'Text node fallback should be cleared in a subsequently layout');
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test(() => {
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const host = document.getElementById('host2');
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const shadow = host.attachShadow({mode: 'open', slotAssignment: 'manual'});
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shadow.innerHTML = '<slot><span>fallback</span></slot>';
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host.offsetHeight; // Force layout
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const slot = shadow.firstChild;
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slot.assign(host.firstChild);
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assert_array_equals(slot.assignedNodes(), [host.firstChild]);
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assert_equals(host.offsetHeight, 0, 'Fallback content should not be rendered');
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}, 'Element fallback should be cleared in a subsequent layout');
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</script>
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