1365832 - postMessage: event.source is not equal to source window

Status: VERIFIED FIXED

(Firefox for iOS :: Browser, defect, P2)

Description

[jenan]

Attachment: minimal_repro.html

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36

Steps to reproduce:

1. open a new window with `var innerWindow = window.open(url, '_blank');`
2. in the inner window, use `window.opener.postMessage('foo', '*');`
3. in the root window, read the event and compare `innerWindow` to `event.source`

Minimal reproduction: https://jenanwise.github.io/firefox-ios-postmessage-event-source/

(source: https://github.com/jenanwise/firefox-ios-postmessage-event-source/)


Actual results:

innerWindow != event.source

Chrome iOS and basic Mobile Safari do not show the same behavior. Neither do Chrome, Firefox, or Safari desktop.


Expected results:

innerWindow === event.source

Comment 1

[Justin D'Arcangelo [:justindarc]]

Landed on master:

https://github.com/mozilla-mobile/firefox-ios/commit/4fd4b66df9d5403268cf60cb63ddc17e04cfee4f

Comment 2

[Catalin Suciu [:csuciu]]

Verifying as fixed on master d6d0585a95b1c9 and Beta v15.b13583.