The Javascript Download: Unpacking a Modern Web Development Phenomenon The Javascript download is a ubiquitous feature of modern web development, referring to the process by which a user's browser requests and receives executable code from a server.
This code is then executed within the context of a web page, enabling dynamic functionality that ranges from interactive graphics to complex client side logic.
At its core, the Javascript download has been around since 1995, when Brendan Eich created Javascript as part of Netscape's Navigator web browser.