MutationObserverInit.subtree

The MutationObserverInit dictionary's optional subtree property can be set to true to monitor the targeted node and all of its descendants. The default value, false, indicates only the target node itself is to be monitored for changes.

subtree can be used in concert with the other options to extend monitoring of attributes, text content, and child lists to the entire subtree rooted at the target node.

Syntax

var options = {
  subtree: true | false
}

Value

A Boolean value. The default, false, indicates that only the target node specified when calling MutationObserver.observe() is to be monitored for changes. Changing this value to true causes the entire subtree rooted at the specified target node to be monitored for the changes indicated by the other options.

For example, to watch the target node only for attribute changes, the MutationObserverInit passed into MutationObserver() can be:

var options = {
  attributes: true,
  subtree: false
};

Since the default value of subtree is false, line 3 is optional.

To monitor the entire subtree for attribute changes, simply set subtree to true:

var options = {
  attributes: true,
  subtree: true
};

Example

Specifications

Specification Status Comment
DOM
The definition of 'MutationObserverInit.subtree' in that specification.
Living Standard Ā 

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
subtreeChrome Full support 26
Full support 26
No support 18Ā ā€” 26
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Edge Full support YesFirefox Full support 14IE Full support 11Opera Full support 15Safari Full support 7
Full support 7
No support 6Ā ā€” 7
Prefixed
Prefixed Implemented with the vendor prefix: webkit
WebView Android ? Chrome Android Full support 26
Full support 26
No support 18Ā ā€” 26
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Firefox Android Full support 14Opera Android Full support 14Safari iOS Full support 7
Full support 7
No support 6Ā ā€” 7
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Samsung Internet Android ?

Legend

Full support Ā 
Full support
Compatibility unknown Ā 
Compatibility unknown
Requires a vendor prefix or different name for use.
Requires a vendor prefix or different name for use.