[JS] (err) Uncaught DOMException: Failed to execute 'insertBefore' on 'Node': The node before which the new node is to be inserted is not a child of this node.

Uncaught DOMException: Failed to execute 'insertBefore' on 'Node': The node before which the new node is to be inserted is not a child of this node.

• 오류 발생
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• 원인
  • et ~ 등등 선택자 사용해야함.)
    
    
• 조치

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• 참고문서
  • https://developer.mozilla.org/en-US/docs/Web/API/Node/insertBefore