HTML / XML / JS, low-level validity (cross-cutting)LowIndustry consensus
Missing rel=noopener on target=_blank
What it is
Security gap on new-tab links.
Why it matters
Reverse-tabnabbing risk.
How to fix it
Add rel=“noopener”.
Impact
Low; security. Consensus (web security best practice).
Evidence
rel=noopener is a standard security practice (web platform guidance). W3C, Web Content Accessibility Guidelines (WCAG) 2.2