Individual skill

new-tab

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Use when reviewing HTML or JSX for anchor elements with target='_blank' to verify rel='noopener noreferrer' is present.

skills/new-tab/SKILL.md

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Matches the observed repository HEAD: Yes
Scanner rules are current: Yes
Repository scan complete: No
Skill scan complete: Yes
Observed behavior: Instructions only
Last checked: Nov 9, 2026

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Repository stars (not skill ratings): 74,693
Repository last updated: Oct 31, 2026
License: MIT

Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.

frontend Repository topic
front-end-development Repository topic
front-end-developer-tool Repository topic
guidelines Repository topic
checklist Repository topic
reference Repository topic
web-development Repository topic
html Repository topic
css Repository topic
javascript Repository topic
engineering Derived category

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SKILL.mdcore · 2,174 bytes
references/rule.mddoc · 4,748 bytes

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# External Link Security

A malicious site opened via target='_blank' can use window.opener.location to silently redirect your original tab to a phishing page — the user switches back and sees a fake login screen on what appears to be your domain.

## Quick Reference

- Always add `rel="noopener noreferrer"` to any `<a target="_blank">` link
- `noopener` prevents the new tab from accessing `window.opener` and redirecting your page
- `noreferrer` additionally suppresses the `Referer` header sent to the destination site
- Modern browsers (Chrome 88+, Firefox 79+) implicitly add `noopener` for cross-origin `_blank` links, but explicit markup is required for older browsers and same-origin links
- ESLint rule `jsx-a11y/anchor-is-valid` and `eslint-plugin-security` can enforce this automatically

## Check