Why SRI?

When your site loads resources from a third-party CDN — FontAwesome, Mermaid, Animate.css — you’re trusting an external party you have no control over. If jsdelivr.net gets compromised, or if a supposedly immutable version is silently mutated, your site can become an attack vector.

Subresource Integrity (SRI) solves this cleanly: every <link> or <script> tag carries an integrity="sha256-…" attribute that the browser verifies before executing the resource. If the hash doesn’t match, the browser blocks the load.