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Import maps: CORS for mapped module URLs, CDN pinning, and integrity attributes with cross-origin scripts
Browsers fetch module graphs with CORS—each mapped URL must allow the page origin.
1 min read
import-mapsesmcors
Scopes
Nested scopes complicate debugging—log resolved URLs in devtools when CORS fails mid-graph.
Multiple import maps are merging in newer proposals—test feature flags per browser.
SSR
Server-rendered HTML may emit different maps than client hydration—keep origins aligned.