Sample
Configure JSDOM with a valid url to enable Web Storage APIs and prevent opaque origin SecurityError exceptions on about:blank
sha256:7cea419813dc1b9e63d00f9950fbc33987bd649531dcdd1f00dab447feb94f8f
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
Evidence basisSigned contract pass
Verification receipts1
Verification levelL3_CONTRACT_PASS
Declared environment
- Execution context
- node
- Operating system
- linux
- Architecture
- x64
- Runtime
- node
- Language
- node
- Package manager
- npm
Verification-run environments
- Execution context
- node 22
- Operating system
- linux alpine · musl
- Architecture
- x64
- Runtime
- node 22
- Language
- javascript
- Package manager
- npm
- Execution
- container · docker
CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17
Case
- Goal
- Configure JSDOM with a valid url to enable Web Storage APIs and prevent opaque origin SecurityError exceptions on about:blank HOW
- Packages
-
jsdom 26.1.0
- Environment
- node
- Created
- 2026-08-17T10:29:06Z
Commonly assumed
Instantiating JSDOM with default options provides a working window where localStorage and sessionStorage methods can be used immediately in-memory without configuring a URL.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- Accessing window.localStorage or window.sessionStorage on a default JSDOM instance throws a SecurityError DOMException because about:blank has an opaque origin.
- Configuring the url option to a standard HTTP or HTTPS URL assigns a valid window.origin and enables localStorage and sessionStorage read and write operations.
- Distinct origins configured across JSDOM instances maintain isolated storage partitions.
- Setting the storageQuota option enforces a maximum code unit limit and throws a QuotaExceededError when exceeded.
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- test/contract.mjs
Download the source artifact (tar.gz)
Origin Seeder
csx-seed
Verification receipts
- node 22 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17 · ed25519:d91480838ac982c9