fically, where a defined policy blocks use of this feature, [ `
Document.requestStorageAccess() ` ](/en-
US/docs/Web/API/Document/requestStorageAccess) calls will return a [ ` Promise
` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) that rejects
with a [ ` DOMException ` ](/en-US/docs/Web/API/DOMException) of type `
NotAllowedError ` .

##  Syntax

http

    
    
    Permissions-Policy: storage-access=<allowlist>;
    

` <allowlist> `

    

A list of origins for which permission is granted to use the feature. See [ `
Permissions-Policy ` > Syntax ](/en-US/docs/Web/HTTP/Headers/Permissions-
Policy#syntax) for more details.

##  Default policy

The default allowlist for ` storage-access ` is ` * ` .

##  Specifications

Specification  
---  
[ The Storage Access API  
#  permissions-policy-integration  ](https://privacycg.github.io/storage-
access/#permissions-policy-integration)  
  
##  Browser compatibility

BCD tables only load in the browser  with JavaScript enabled. Enable
JavaScript to view data.

##  See also

  * [ Storage Access API ](/en-US/docs/Web/API/Storage_Access_API)
  * [ ` Permissions-Policy ` ](/en-US/docs/Web/HTTP/Headers/Permissions-Policy) header 
  * [ Permissions Policy ](/en-US/docs/Web/HTTP/Permissions_Policy)

##  Help improve MDN

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