It is difficult to be precise about "dynamic web page beginnings" or chronology, because the precise concept makes sense only after the "widespread development of web pages". HTTP has been in use since 1990, HTML, as standard, since 1996. Web pages that change in response to an action within that web page, such as a mouse or a keyboard action, use client-side scripting. Client-side scripts generate client-side content. Client-side content is content that's generated on the user's computer rather than the server. In these cases, the user's web browser would download the web page content from the server, process the code that's embedded in the web page, and then display the updated content to the user. Scripting languages such as JavaScript and Flash allow a web page to respond to client-side events.