Matan · Security · Content
noopener on target=_blank
Links that open a new tab should set rel=noopener (or noreferrer) to prevent tabnabbing.
Pass condition in our engine: target=_blank links include noopener or noreferrer.
1. Problem description
The new page can historically rewrite window.opener. Modern browsers default noopener on _blank, but explicit rel remains good hygiene and helps older agents. We flag target=_blank without noopener/noreferrer.
2. Most common causes
- CMS automatically adds target=_blank to all externals.
- Share buttons generated without rel.
3. How to fix it
- Add rel="noopener noreferrer" (noreferrer also hides Referer).
- Or drop target=_blank and let users choose.
Test this check
We fetch only this URL (plus robots.txt / llms.txt at the domain root when the check needs them). We do not crawl the rest of the site like a full report.
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