The sandbox policy
The sandbox policy determines a set of capabilities a document will have. It is defined in two types of objects:
- The frame.
- The document.
The frame policy is parsed from the ’s sandbox attribute. Example:
The document policy is parsed from the HTTP Content-Security-Policy header. Example: Content-Security-Policy: sandbox allow-script allow-origin
On top of that, the sandbox policy is inherited from:
- The frame to its document.
- The document to its children frames.
- The document to its opened windows’s main frame.
The distinction between a frame and a document is important. The document is replaced after navigations, but the frame stays.
The sandbox policy is bit field. The sandbox flags are defined by: /services/network/public/mojom/web_sandbox_flags.mojom Multiple sandbox policy are combined using a bitwise AND in the bitfield. This way, the policy can only be further restricted.
Specification: