What is the Minimum Timeout Value for setTimeout in JavaScript?

Understanding the Minimum Timeout Value in setTimeout

In JavaScript, the setTimeout() function is widely used to schedule callbacks to be executed after a specified delay. However, browser implementations of setTimeout() can vary, including the minimum millisecond value that can be specified as the delay.

Modern Browsers (Post-2010)

According to the HTML5 specification, the minimum timeout value for modern browsers is set at 4 milliseconds (ms). This value ensures that callbacks are executed with consistent timing across different browsers and operating systems.

Older Browsers (Pre-2010)

Prior to the release of Firefox 5.0 and other browsers in 2010, the minimum timeout value for nested timeouts was 10 ms. This was due to limitations in the browser's event loop architecture at the time.

Recommended Minimum Value for Compatibility

To ensure compatibility with both modern and older browsers, it is generally recommended to use a minimum timeout value of 10 ms. This value ensures that callbacks will be executed reliably in all browser environments.

However, if precise timing is not crucial for the specific use case, a value of 4 ms can be used in modern browsers to optimize performance and minimize scheduling delays. It is important to note that this value may not be supported in legacy browsers and may result in inconsistencies.

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