Are Javascript Timers API's like XHR and Canvas?

For a deeper understanding of Javascript, I would like to know if the Timers (created with setTimeout and setInterval) are API's just like all the others included with HTML5, the DOM etc?

If so, what is Javascript purely?

@edit

this discussion started when I was thinking about Node, trying to compare what is Node (Javascript on server) with the good old Javascript on the browser

via Victor Ferreira