Signature-based resource integrity
Signature-based resource integrity verifies a script's provenance by checking that the resource has been signed with a trusted key given by the <script> element's integrity attribute. It is most useful when native HTML semantics or browser capabilities can replace custom implementation work.
Overview
Signature-based resource integrity verifies a script's provenance by checking that the resource has been signed with a trusted key given by the <script> element's integrity attribute. It is most useful when native HTML semantics or browser capabilities can replace custom implementation work.
Browser support
| Feature | Desktop | Mobile | ||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Safari | Chrome Android | Safari iOS | |
http.headers.Signature Experimental | 141 | 141 | | | 141 | |
html.elements.script.integrity.ed25519_public_key Experimental Signature-based integrity (Ed25519 public key values) | 141 | 141 | | | 141 | |
http.headers.Signature-Input Experimental | 141 | 141 | | | 141 | |
http.headers.Unencoded-Digest Experimental | 141 | 141 | | | 141 | |
Syntax
<script src="https://cdn.example.com/lib.js"
integrity="ed25519-[base64-signature]">
</script>Live demo
Integrity model
Compare hash-based and signature-based trust checks for fetched resources.
Why signatures help
A signature model can decouple trust from one exact byte-for-byte file version.
Deployment cost
Stronger trust guarantees usually require key management and signing infrastructure.
Use cases
Control document behavior
Use Signature-based resource integrity to influence loading, metadata, or script behavior at the document level.
Tune performance strategy
Apply Signature-based resource integrity when earlier resource hints or document settings improve startup or runtime behavior.
Cautions
- Test Signature-based resource integrity in your target browsers and input environments before depending on it as a primary behavior.
- Provide a fallback path or acceptable degradation strategy when support is still limited.
Accessibility
- Make sure Signature-based resource integrity supports the intended task without making the page harder to perceive, understand, or operate.
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