element-internals-behaviors.tentative.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /custom-elements/element-internals-behaviors.tentative.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>ElementInternals behaviors API</title>

<link rel="author" href="mailto:ansollan@microsoft.com">

<link rel="help" href="https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/PlatformProvidedBehaviors/explainer.md">

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

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

<script>

customElements.define('test-element', class extends HTMLElement {});

test(() => {

  const element = document.createElement('test-element');

  const ei = element.attachInternals({ behaviors: [] });

  assert_not_equals(ei, null);

}, 'attachInternals({ behaviors: [] }) accepts empty behaviors array');

test(() => {

  const element = document.createElement('test-element');

  const ei = element.attachInternals();

  assert_not_equals(ei.behaviors, undefined);

  assert_equals(ei.behaviors.length, 0);

}, 'behaviors returns empty array when no behaviors configured');

</script>