998503 - MutationObserver not working correctly for the subtree option

Status: RESOLVED DUPLICATE of bug 902618

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

Description

[Andres C. Rodriguez]

Attachment: bug.html

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:28.0) Gecko/20100101 Firefox/28.0 (Beta/Release)
Build ID: 20140314220517

Steps to reproduce:

In theory, the subtree option of a MutationObserver should observe all nodes below the target node. That is not happening. It is happening in both Chrome and Safari, and per the spec at:

http://lists.w3.org/Archives/Public/public-webapps/2011JulSep/1622.html

We have "At any point, if a node becomes a descendant of |target|, it is synchronously added to the observed set".

I have attached a minimal test case in one HTML file, please load in Firefox and you will see what I am taking about.


Actual results:

Console Printout in Firefox 28:

BODY
HEADER
MAIN
FOOTER



Expected results:

Console Printout in Safari 7:

BODY
HEADER
UL
LI
LI
LI
LI
MAIN
P
FOOTER
DIV
DIV
TABLE 
DIV
DIV
STYLE 
STYLE 
LINK
LINK

Comment 1

[Andres C. Rodriguez]

Please ignore all the tags after FOOTER for the expected result. I just realized that Evernote is adding the additional DOM nodes that are reported.