HTML and CSS Reference
In-Depth Information
Figure D.5. Having event-driven communication means data is sent exactly as often and exactly when it becomes
available. Data is received without any wasted requests or delays.
Event-driven communication is clearly more efficient because it exactly matches the fre-
quency of communication with the frequency of the availability of new data. With no built-
in support for event-driven messaging, web developers who wanted to avoid the use of
plug-ins have resorted to two HTML/JavaScript hacks to simulate it: long polling and the
forever frame.
