# fromMutationObserver

[#](/rxjs-book/summary/rxjs_bindings/dom/mutation_observers/from_mutation_observer.md#rxdomfrommutationobservertarget-options)[Ⓢ](https://github.com/Reactive-Extensions/RxJS-DOM/blob/master/rx.dom.js#L471-L485) \[Ⓣ]\[1]

Creates an observable sequence from a `MutationObserver`. The `MutationObserver` provides developers a way to react to changes in a DOM. This requires `MutationObserver` to be supported in your browser/JavaScript runtime.

## Arguments

1. `target` *(Node)*: The Node on which to obserave DOM mutations.
2. `options` *(MutationObserverInit)*: A [`MutationObserverInit`](http://msdn.microsoft.com/en-us/library/windows/apps/dn252345.aspx) object, specifies which DOM mutations should be reported.

## Returns

*(Observable)*: An observable sequence which contains mutations on the given DOM target.

## Example

```javascript
var foo = document.getElementById('foo');

var obs = Rx.DOM.fromMutationObserver(foo, { 
    attributes: true, 
    childList: true, 
    characterData: true,
    attributeFilter: ["id", "dir"]
});

foo.dir = 'rtl';

// Listen for mutations
obs.subscribe(function (mutations) {
    mutations.forEach(function(mutation) {
        console.log("Type of mutation: " + mutation.type);

        if ("attributes" === mutation.type) {
            console.log("Old attribute value: " + mutationRecord.oldValue);
        }
    });
});
```


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