Selenium 1 or Selenium Remote Control or Selenium RC - Selenium RC mechanism to executes Scripts Selenium RC is a popular UI automation library, allowing developers and testers to automate their interactions with a Web Application Under Test (WAUT) by providing them with the necessary libraries, supported in multiple languages, to program. In terms of design, Selenium RC chose to use generic JavaScript named Selenium Core to drive the WAUT on a browser. However, the decision of using generic JavaScript that can drive the WAUT on any browser should comply with a security policy named Same-Origin Policy. Every available browser in the market imposes this policy on the websites that are loaded on it. To know about this policy, we should take a closer look at how a browser executes JavaScript loaded from a website. For every website that is loaded on it, the browser creates a separate sandbox for the website's JavaScript, which restricts the JavaScript to be executed only on it&#