Solution to JavaScript error when adding elements using append_javascript skills

1. Error description

On IE browser:

Uncaught HierarchyRequestError:Failed to excute 'appendChild' on 'Node':The new child element contains the parent.

On Google Chrome:

SCRIPT5022:DOM Exception:HIERARCHY_REQUEST_ERR(3) error

2. Error reason

Include append() within append()

For example:

append(append("String"));

3. Solution

Remove the append in append and put the string in the inner append into the outer append