Policy
Block JavaScript from using JIT on these sites
Microsoft Edge
Policy overview
Key metadata and intent for this policy.
Supported OS tags: Windows7
Allows you to set a list of site URL patterns that specify sites that aren't allowed to run JavaScript JIT (Just In Time) compiler enabled. Disabling the JavaScript JIT means that Microsoft Edge may render web content more slowly, and may also disable parts of JavaScript including WebAssembly. Disabling the JavaScript JIT may allow Microsoft Edge to render web content in a more secure configuration. For detailed information on valid URL patterns, see https://go.microsoft.com/fwlink/?linkid=2095322. Wildcards, *, are allowed. JavaScript JIT policy exceptions will only be enforced at a site granularity (eTLD+1). A policy set for only subdomain.contoso.com will not correctly apply to contoso.com or subdomain.contoso.com since they both resolve to the same eTLD+1 (contoso.com) for which there is no policy. In this case, policy must be set on contoso.com to apply correctly for both contoso.com and subdomain.contoso.com. This policy applies on a frame-by-frame basis and not based on top-level origin URL alone; so, for example, if contoso.com is listed in the JavaScriptJitBlockedForSites policy but contoso.com loads a frame containing fabrikam.com, then contoso.com has JavaScript JIT disabled, but fabrikam.com uses the policy from 'DefaultJavaScriptJitSetting' (Control use of JavaScript JIT), if set, or default to JavaScript JIT enabled. If you don't configure this policy for a site, then the policy from 'DefaultJavaScriptJitSetting' applies to the site, if set; otherwise, JavaScript JIT is enabled for the site. Example value: [*.]example.edu
Registry values
How enabled and disabled states update the registry.
No explicit registry values are set for enabled or disabled states.
Policy elements
Inputs and configuration options exposed by this policy.
| Scope | Element | Type | Registry mapping | Constraints & behavior | Copy |
|---|---|---|---|---|---|
Block JavaScript from using JIT on these sites ID JavaScriptJitBlockedForSitesDesc | list | Path Software\Policies\Microsoft\Edge\JavaScriptJitBlockedForSites Value name 1, 2, … Type REG_SZ | List: standard |