Unable to Remove Custom Element - NotFoundError on removeChild

registered a custom element using `customElements.define('web-test')`. However, when I try to delete the `` element from the HTML, I always get the following error:

```
Uncaught NotFoundError: Failed to execute 'removeChild' on 'Node': The node to be removed is not a child of this node.
```
Is there an alternative method to remove a custom element that has been registered in HTML without encountering this error?

No repository file, test, or entry point is named. Start by reproducing the customElements.define and removeChild scenario described in the issue, then trace which node owns the element and where removal is attempted. Done means the repository-specific cause is identified and the supported removal behavior is documented or covered by a regression test.

Written by the indexing model from the issue text.