MutationObserver shadow-dom show NotFoundError in IE11

[zhoukekestar]

Description

See the example.

Example

<script src="https://gw.alipayobjects.com/os/lib/webcomponents/webcomponentsjs/2.6.0/webcomponents-bundle.js"></script>


<div id="shadowHost"></div>
<script>
  shadowHost.attachShadow({mode:'open'}).innerHTML = '<div></div>';

  (new MutationObserver(function (mutationsList) {
    console.info('mutated');
  })).observe(shadowHost.shadowRoot, { childList: true });

  shadowHost.shadowRoot.appendChild(document.createElement('div'));

</script>

Steps to reproduce

see the example

Expected behavior

No Error

Actual behavior

NotFoundError

Version

@webcomponents/[email protected]

Browsers affected

• Chrome
• Firefox
• Edge
• Safari
• IE 11

[zhoukekestar]

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.