imperative-slot-initial-fallback.html

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This WPT test may be referenced by the following Test IDs:
- /shadow-dom/imperative-slot-initial-fallback.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Imperative Slot API: intial fallback should be correctly set up</title>

<link rel="author" href="mailto:xiaochengh@chromium.org">

<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1292292">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<div>

  <div id="host1"></div>

  <div id="host2"></div>

</div>

<script>

test(() => {

  const host = document.getElementById('host1');

  const shadow = host.attachShadow({mode: 'open', slotAssignment: 'manual'});

  shadow.innerHTML = '<slot>fallback</slot>';

  const slot = shadow.firstChild;

  assert_array_equals(slot.assignedNodes(), []);

  assert_greater_than(host.offsetHeight, 0, 'Fallback content should be rendered');

}, 'Unassigned imperative slot can render text node as the initial fallback');

test(() => {

  const host = document.getElementById('host2');

  const shadow = host.attachShadow({mode: 'open', slotAssignment: 'manual'});

  shadow.innerHTML = '<slot><span>fallback</span></slot>';

  const slot = shadow.firstChild;

  assert_array_equals(slot.assignedNodes(), []);

  assert_greater_than(host.offsetHeight, 0, 'Fallback content should be rendered');

}, 'Unassigned imperative slot can render element as the initial fallback');

</script>