Individual skill
subresource-integrity
Use when reviewing templates, rendered HTML, or shared components related to Add Subresource Integrity to external scripts. Validate the final browser-facing markup, not just the source framework abstraction.
skills/subresource-integrity/SKILL.md
Source commit e8d14d049010e2ce25afcd5e8609dfcbbe63e47e
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- Last checked
- Nov 9, 2026
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- Repository stars (not skill ratings)
- 74,690
- Repository last updated
- Oct 31, 2026
- License
- MIT
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- 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 · 2,043 bytesSKILL.mdcore · 2,043 bytesreferences/rule.mddoc · 4,031 bytes
Read excerpt
# Add Subresource Integrity to external scripts
When you load JavaScript from a CDN, you're trusting that CDN completely — if it's compromised, attackers can serve malicious JavaScript to all your users. SRI adds a cryptographic hash to the tag; the browser refuses to execute the script if the hash doesn't match the downloaded content, protecting users even if the CDN is compromised or the URL is hijacked.
## Quick Reference
- Add integrity="sha384-..." to <script> and <link> tags loading from CDNs
- Always pair integrity with crossorigin="anonymous"
- Generate hashes with openssl or online tools — CDN providers usually supply them
- SRI blocks execution if the file hash doesn't match, preventing CDN compromise attacks
## Check
Find all external <script> and <link rel=stylesheet> tags in this HTML that load from CDNs and don't have integrity attributes. List each one.