Mutation Obervers in Chrome are not detecting attribute and css changes

I am in Chrome 19 and I created a new mutation observer object:

var observer = new WebKitMutationObserver(function(mutations, observer) {
  console.log(mutations, observer);

And then I observe:

observer.observe(document, {
  subtree: true,
  childList: true,
  characterData: true,
  attribute: true      

It seems that this setup only gets triggered when i insert or remove a node, or change the text of a node. It does not get triggered if I change an attribute or an inline css style of an element. Why is this?


According to the spec draft, the property you want to set is attributes: true, not attribute: true.

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