Individual skill
mixed-content
Use when reviewing an HTTPS page for resources (scripts, images, stylesheets, iframes) that are loaded over plain HTTP.
skills/mixed-content/SKILL.md
Source commit e8d14d049010e2ce25afcd5e8609dfcbbe63e47e
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- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- Yes
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Network or broad shell
- Last checked
- Nov 9, 2026
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Repository context
- Repository stars (not skill ratings)
- 74,709
- 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
- writing Derived category
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SKILL.mdcore · 2,317 bytesSKILL.mdcore · 2,317 bytesreferences/rule.mddoc · 5,365 bytes
Read excerpt
# Avoid mixed content on HTTPS pages
Active mixed content (scripts loaded over HTTP into an HTTPS page) gives network attackers the ability to execute arbitrary JavaScript on your page — the same power as XSS, despite the page itself being served over HTTPS.
## Quick Reference
- Active mixed content (scripts, iframes, stylesheets) is blocked outright by all modern browsers
- Passive mixed content (images, audio, video) triggers a security warning and may be upgraded or blocked
- Use `upgrade-insecure-requests` CSP directive to automatically upgrade HTTP sub-resources to HTTPS
- Audit all hardcoded `http://` URLs in HTML, CSS, and JavaScript
- The `Content-Security-Policy: upgrade-insecure-requests` directive is the most practical fix for legacy content
## Check
