Window: cancelIdleCallback() method

The 
window.cancelIdleCallback() method cancels a callback
previously scheduled with window.requestIdleCallback().
Syntax
cancelIdleCallback(handle)
Parameters
handle
: The ID value returned by window.requestIdleCallback() when the
callback was established.
Return value
None (undefined).
Examples
See our complete example
in the article Cooperative Scheduling of Background Tasks API.
Specifications
Browser compatibility