This change allows developers to selectively enable and disable sandbox features in any frame, including top-level documents, through the feature policy HTTP header or the <iframe> "allow" attribute. These features are included: "forms" "modals" "orientation-lock" "plugins" "pointer-lock" "popups" "presentation" "scripts" "top-navigation"


Status in Chromium


No longer pursuing

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

  • No signal
  • No signal
  • No signals



As of August 2019, we are not currently pursuing this restructuring of sandbox features. The current focus is on implementing Document Policy ( and then using that to reimplement sandboxing.

Last updated on 2021-09-24