We’ve been anticipating the release of WordPress 3.6 for weeks now, but it’s definitely alive – and you could say it even has a pulse.
The Heartbeat API will be a new feature introduced in the latest release. It’s been designed to deliver login expiration notifications, provide post locking and trigger autosaves - making writers like me very happy.
According to Andrew Ozz who is leading the API’s development:
“The purpose of this API is to simulate bidirectional connection between the browser and the server. Initially it will be used for autosave, post locking and log-in expiration warning while a user is writing or editing.