() method on the
IdleDeadline interface returns the estimated number of milliseconds remaining in the current idle period. The callback can call this method at any time to determine how much time it can continue to work before it must return. For example, if the callback finishes a task and has another one to begin, it can call
timeRemaining() to see if there's enough time to complete the next task. If there isn't, the callback can just return immediately, or look for other work to do with the remaining time.
By the time
timeRemaining() reaches 0, the callback must return control to the user agent's event loop.
timeRemaining = IdleDeadline.timeRemaining();
DOMHighResTimeStamp value (which is a floating-point number) representing the number of milliseconds the user agent estimates are left in the current idle period. The value is ideally accurate to within about 5 microseconds.
|Cooperative Scheduling of Background Tasks||Proposed Recommendation|
|Feature||Android webview||Chrome for Android||Edge mobile||Firefox for Android||Opera Android||iOS Safari||Samsung Internet|
1. From version 53: this feature is behind the
dom.requestIdleCallback.enabled preference (needs to be set to
true). To change preferences in Firefox, visit about:config.
- Collaborative Scheduling of Background Tasks