What Replaces the Depreciated DOMSubtreeModified Event in DOM Level 3?

Deprecation of DOMSubtreeModified Event in DOM Level 3

The DOMSubtreeModified event has been deprecated in DOM level 3. The reason for this deprecation is explained in the DOM Level 3 Events specification:

Warning! The MutationEvent interface was introduced in DOM Level 2 Events, but has not yet been completely and interoperably implemented across user agents. In addition, there have been critiques that the interface, as designed, introduces a performance and implementation challenge. A new specification is under development with the aim of addressing the use cases that mutation events solves, but in more performant manner. Thus, this specification describes mutation events for reference and completeness of legacy behavior, but deprecates the use of both the MutationEvent interface and the MutationNameEvent interface.

In place of the DOMSubtreeModified event, developers are encouraged to use mutation observers, which provide a more performant and standardized way to track changes to the DOM. Mutation observers are available in all major modern browsers and can be used to efficiently track changes to the DOM, regardless of the event that caused the change.

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