As the very first pages were served on the open web in

1990

, people recognized that the ability to deliver dynamic content would make the web unique—you could provide information and function just by sharing a URL. The

Common Gateway Interface

standard released in 1993 defined a simple interface for web servers to run code in response to web requests. It brought a new era of experience and capability to computing, accessible at the click of a link. Hop forward two short years to JavaScript, then another year to frames, specifically the <iframe> tag. These innovations let developers dynamically load content into pages, brought a new level of interactivity to the web, and increased user expectations of what could be done in the browser.