strongboundary

strongboundary is a term used in certain programming contexts, particularly in discussions related to JavaScript and its execution environments. It generally refers to a point in a program's execution where there is a strict separation between different execution contexts or realms. This separation is designed to prevent code in one realm from directly interfering with or accessing the internal state of another realm.

The concept of strong boundaries is often discussed in relation to security and predictability. By enforcing these boundaries, it becomes more difficult for malicious code to exploit vulnerabilities in other parts of the system or for unmanaged side effects to propagate unexpectedly. For instance, in a web browser, different origins (defined by protocol, domain, and port) are typically separated by strong boundaries, limiting how JavaScript code from one website can interact with data or code from another.

In JavaScript, the concept can be related to mechanisms like iframes or Web Workers, which provide isolated environments. While these provide a degree of isolation, the exact definition and enforcement of "strongboundary" can vary depending on the specific technology or framework being discussed. The goal is always to create a more robust and secure execution model by clearly delineating areas of code and their associated data.