What is Noopener?
Noopener is a link attribute that prevents newly opened pages from accessing the originating page’s window object, protecting against security vulnerabilities and performance issues.
Ecommerce SEO Glossary > Technical SEO > Noopener
What You Need to Know about Noopener
Security Vulnerability Prevention
Without noopener, malicious sites can manipulate your original page through window.opener JavaScript access after users click links.
Tabnabbing Attack Protection
Noopener blocks attackers from redirecting your original tab to phishing pages while users browse opened links.
Browser Performance Improvement
Links with noopener run in separate processes, preventing slow external sites from affecting your page’s performance.
Target Blank Requirement
Modern browsers automatically apply noopener behavior to target=”_blank” links, but explicit declaration ensures consistent protection.
JavaScript Context Isolation
This attribute severs the JavaScript connection between parent and child windows for complete process separation.
Universal Browser Support
All modern browsers support noopener, making it a standard best practice for external link security.
Frequently Asked Questions about Noopener
1. When should I use noopener attribute?
Add to all external links opening in new tabs, especially for untrusted or user-generated link destinations.
2. Does noopener affect SEO rankings?
No direct ranking impact, but it improves site security and performance which indirectly support user experience signals.
3. What’s the correct noopener syntax?
Use < a href="url" target="_blank" rel="noopener"> or combine with noreferrer as rel=”noopener noreferrer”.
4. Is noopener different from noreferrer?
Yes, noreferrer also blocks referrer information while noopener only prevents window.opener access; both can be combined.
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