The rel="______" attribute value is often used alongside target="_blank" to enhance security.

  • external 
  • nofollow 
  • noopener 
  • noreferrer 
The rel="noopener" attribute is used to ensure that when a new window or tab is opened via target="_blank", the new page runs in a separate process and doesn't have access to the source window via the window.opener property. This helps prevent potential malicious attacks. rel="noreferrer" also provides this feature but with the added behavior of not sending a referrer header. 
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