File: test_declarative_shadowdom_reentry.html

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<!DOCTYPE html>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=1870055
-->
<head>
  <title>Test for Logging of Declarative ShadowDOM attachment failure</title>
  <script type="text/javascript" src="head.js"></script>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<script>
SimpleTest.waitForExplicitFinish();

document.addEventListener('DOMContentLoaded', async () => {
  SpecialPowers.pushPrefEnv({"set": [["dom.mutation_events.enabled", true]]}, () => {
    const node = document.createElement('div');
    document.documentElement.appendChild(node);
    document.addEventListener('DOMSubtreeModified', (e) => {
      node.setHTMLUnsafe('b');
      is(node.textContent, 'b', 'Re-entry into setHTMLUnsafe is valid');
      SimpleTest.finish();
    }, { once: true });
    node.setHTMLUnsafe('a');
  });
});
</script>