That phrasing isn't very precise, but I presume they mean to use setTimeout and pass a timeout of 0 [0]. That link has some discussion of this use and suggests

That phrasing isn't very precise, but I presume they mean to use setTimeout and pass a timeout of 0 [0]. That link has some discussion of this use and suggests using window.postMessage instead, at least on "modern browsers", for a suitable definition of modern. [0] https://developer.mozilla.org/en/DOM/window.setTimeout https://developer.mozilla.org/en/DOM/window.setTimeout