Not an SVG issue - that's might just be one of the cases where this property would be useful.

To quote HTMLObjectElement.idl:

// TODO(philipj): readonly attribute WindowProxy? contentWindow;

Spec: https://html.spec.whatwg.org/multipage/embedded-content.html#dom-object-contentwindow

I notice that the corresponding property for HTMLIFrameElement is hooked up.

Is it enough just to uncomment that line? AFAIK the glue code should be generated automatically.

If that's all we need to do, I'll be happy to take on this issue.

I've attempted the fix described in comment 3.

While postMessage() seems to work, I couldn't access any JavaScript user-defined variables directly.

See the attached test.html and test.svg files --
* On Chromium 49, it says "missing contentWindow"
* On Firefox, it says "has contentWindow and attributes accessible"
* On Chromium with this patch, it says "has contentWindow but attributes not accessible"

I'm not sure what the correct behavior is here, so I'll leave the issue for now.

Deleted: 601771.patch 719 bytes

601771.patch 719 bytes Download

Deleted: test.html 581 bytes

test.html 581 bytes View Download

Deleted: test.svg 218 bytes

test.svg 218 bytes Download

If you were loading them through file://, then I think that's the expected behavior. (Try http(s).)

Ah, it works now.

I'd tried loading the file through HTTP before, but I must have messed up the testing back then.

CL submitted: https://codereview.chromium.org/1889993004

@sworddragon2 -- Could you please verify on Latest Stable# 50.0.2661.94 and respond to the Comments# 5,6 & 7 and please provide the update which would help us triage the issue further.
Note: Removing Needs-Bisect label as of now.
Thanks in Advance.

I'm not sure what you expect me to verify (as the linked CL failed for now) and what I shall respond to for the comments 5-7 as they look already handled. Or do I miss something specific?

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/cc526ef25f0b6d2a819700ccbeac2b3acf6fab80

commit cc526ef25f0b6d2a819700ccbeac2b3acf6fab80
Author: shanmuga.m <shanmuga.m@samsung.com>
Date: Wed Jun 22 16:30:31 2016

Add contentWindow attribute for <object> elements

Firefox supporting contentWindow attribute for <object>
element.

BUG= 601771 

Review-Url: https://codereview.chromium.org/2077523002
Cr-Commit-Position: refs/heads/master@{#401302}

[add] https://crrev.com/cc526ef25f0b6d2a819700ccbeac2b3acf6fab80/third_party/WebKit/LayoutTests/fast/dom/HTMLObjectElement/HTMLObject-contentWindow-query.html
[add] https://crrev.com/cc526ef25f0b6d2a819700ccbeac2b3acf6fab80/third_party/WebKit/LayoutTests/fast/dom/HTMLObjectElement/resources/HTMLObject-contentWindow.svg
[modify] https://crrev.com/cc526ef25f0b6d2a819700ccbeac2b3acf6fab80/third_party/WebKit/LayoutTests/fast/dom/plugin-attributes-enumeration-expected.txt
[modify] https://crrev.com/cc526ef25f0b6d2a819700ccbeac2b3acf6fab80/third_party/WebKit/LayoutTests/imported/wpt/html/semantics/embedded-content/the-object-element/object-attributes-expected.txt
[modify] https://crrev.com/cc526ef25f0b6d2a819700ccbeac2b3acf6fab80/third_party/WebKit/LayoutTests/virtual/stable/webexposed/element-instance-property-listing-expected.txt
[modify] https://crrev.com/cc526ef25f0b6d2a819700ccbeac2b3acf6fab80/third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-expected.txt
[modify] https://crrev.com/cc526ef25f0b6d2a819700ccbeac2b3acf6fab80/third_party/WebKit/LayoutTests/webexposed/element-instance-property-listing-expected.txt
[modify] https://crrev.com/cc526ef25f0b6d2a819700ccbeac2b3acf6fab80/third_party/WebKit/LayoutTests/webexposed/global-interface-listing-expected.txt
[modify] https://crrev.com/cc526ef25f0b6d2a819700ccbeac2b3acf6fab80/third_party/WebKit/Source/core/html/HTMLObjectElement.idl

 Issue 492804  has been merged into this issue.