File: ShadowRoot-init-declarative.html

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<!doctype html>
<title>Scoped Custom Element Registries: declarative shadow root</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="host">
  <template shadowrootmode="open" shadowrootcustomelementregistry>
    <custom-element></custom-element>
    <div></div>
  </template>
</div>
<script>
test(() => {
  const customElement = host.shadowRoot.firstElementChild;
  assert_equals(customElement.customElementRegistry, null);
  customElement.attachShadow({
    mode: "open"
  });
  assert_equals(customElement.shadowRoot.customElementRegistry, null);
}, "Custom element inside 'shadowrootcustomelementregistry' declarative shadow root");

test(() => {
  const divElement = host.shadowRoot.lastElementChild;
  assert_equals(divElement.customElementRegistry, null);
  divElement.attachShadow({
    mode: "open"
  });
  assert_equals(divElement.shadowRoot.customElementRegistry, null);
}, "Built-in element inside 'shadowrootcustomelementregistry' declarative shadow root");
</script>