v134 · performance
Header Impact Explorer
Pick a real-world page archetype and see whether Document-Policy: expect-no-linked-resources is safe to deploy, which resources would violate the policy, the exact response header, and how much parse work the browser can skip when the hint is respected.
Document-Policy is a browser-enforced header — simulation
Document-Policy: expect-no-linked-resources tells the browser the page has no <link> resources, so it can skip speculative pre-parsing of the HTML for subresource hints. Any <link> tag encountered after the policy is set triggers a policy violation. Safe only for pages that truly have none — typically server-rendered SPA shells, API responses rendered as HTML, or offline-first app shells.
Page archetype
Resource breakdown
| Resource | Type | In <link> tag? | Policy violation |
|---|
Impact metrics
Generated response header