• Links to cross-origin destinations are unsafe
  • When you add a link that opens in a new tab, WordPress will automatically add the rel="noopener" attribute to that link.
  • The other page can access your window object with the window.openerproperty. This may allow the other page to redirect your page to a malicious URL.
  • Adding rel="noopener" or rel="noreferrer" to your target="_blank" links avoids these issues.

• What Is rel=”noopener” in WordPress? 
• Opening Links in new tab includes “noopener” “noreferrer” by default in WP

• nofollow attribute prevents your website from passing on SEO link juice to the linked website.
  • Search engines should ignore this link
  • How to Add Nofollow Links
  • Add rel=”nofollow” Links in Block Editor

• Link Contrast Checker