1180373 - Mutation Observer doesn't recognize added noded in previously added nodes

Status: RESOLVED INVALID

(Core :: DOM: Core & HTML, defect)

Description

[Stefan Hahn]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:39.0) Gecko/20100101 Firefox/39.0
Build ID: 20150630154324

Steps to reproduce:

Test case: http://jsfiddle.net/cn8cznqb/2/

First, you add a Mutation Observer to a given element. This mutation observer is configured to check for mutations in the child tree as well. For testing purposes all other mutations than node addition are not considered, maybe you have to check removal, character and attribute mutations as well.

Second, you programmatically add a child to the node the observer is attached to.

Third, you programmatcially add a child to the node added in step two.


Actual results:

The observer fires as expected in the second step. You get everything you need and everything seems find.
But the observer doesn't fire in the third step.


Expected results:

The observer should fire in the third step as well, as the observer is configured to check for mutations in the child tree as well.

Comment 1

[Alice0775 White]

shoud be configured |subtree: true| as well.

Comment 2

[Olli Pettay [:smaug][[e-mail]]]

Yeah, you need subtree: true