981423 - variable assignment from return value of native FF function is different from assignment to same text value

Status: RESOLVED INCOMPLETE

(Firefox :: Untriaged, defect)

Description

[Owyn Tyler]

Attachment: screen of FF console log with test code execution

User Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.117 Safari/537.36

Steps to reproduce:

when you assign `img.src` variable to `"\/\/farm9.staticflickr.com\/8125\/8631271691_27957357a9_o.jpg";` from console it works as expected, when you do it from return of native FF function - it sets variable wrong (not removing escaping \ scaracters). - Google Chrome works same in both cases as FireFox in direct text assignment.

result from function return assignment: 
i.src == "http://flickr.com/photos/mscorley/8631271691/%5C/%5C/farm9.staticflickr.com%5C/8125%5C/8631271691_27957357a9_o.jpg"

result from direct text assignment:

i.src == "http://farm9.staticflickr.com/8125/8631271691_27957357a9_o.jpg"


test address: https://secure.flickr.com/photos/mscorley/8631271691/
screen with execution result attached:
text log of tests copied from FF console:

17:21:12.694 function find_text_in_scripts(a, b)
{
	var s = document.getElementsByTagName("script");
	for(var c=0;c<s.length;c++) 
	{
		var start_pos = s[c].innerHTML.indexOf(a);
		if(start_pos == -1){continue;}
		start_pos += a.length;
		i = s[c];
console.warn(s[c].innerHTML.substring(start_pos,s[c].innerHTML.indexOf(b,start_pos)));

		i.src = s[c].innerHTML.substring(start_pos,s[c].innerHTML.indexOf(b,start_pos));
console.warn(i.src);

console.warn(decodeURIComponent(s[c].innerHTML.substring(start_pos,s[c].innerHTML.indexOf(b,start_pos))));

		i.src = decodeURIComponent(s[c].innerHTML.substring(start_pos,s[c].innerHTML.indexOf(b,start_pos)));
console.warn(i.src);
		return true;
	}
	return false;
}
17:21:12.717 undefined
17:21:17.054 find_text_in_scripts('"o":{"url":"', '"');
17:21:17.056 true
17:21:17.057 "\/\/farm9.staticflickr.com\/8125\/8631271691_27957357a9_o.jpg"
17:21:17.057 "http://flickr.com/photos/mscorley/8631271691/%5C/%5C/farm9.staticflickr.com%5C/8125%5C/8631271691_27957357a9_o.jpg"
17:21:17.057 "\/\/farm9.staticflickr.com\/8125\/8631271691_27957357a9_o.jpg"
17:21:17.057 "http://flickr.com/photos/mscorley/8631271691/%5C/%5C/farm9.staticflickr.com%5C/8125%5C/8631271691_27957357a9_o.jpg"
17:21:52.101 i.src
17:21:52.104 "http://flickr.com/photos/mscorley/8631271691/%5C/%5C/farm9.staticflickr.com%5C/8125%5C/8631271691_27957357a9_o.jpg"
17:21:56.213 i.src = "\/\/farm9.staticflickr.com\/8125\/8631271691_27957357a9_o.jpg";
17:21:56.216 "//farm9.staticflickr.com/8125/8631271691_27957357a9_o.jpg"
17:21:59.469 i.src
17:21:59.472 "http://farm9.staticflickr.com/8125/8631271691_27957357a9_o.jpg"



Actual results:

i.src == "http://flickr.com/photos/mscorley/8631271691/%5C/%5C/farm9.staticflickr.com%5C/8125%5C/8631271691_27957357a9_o.jpg"


Expected results:

i.src == "http://farm9.staticflickr.com/8125/8631271691_27957357a9_o.jpg"

Comment 1

[Paul Pasca[Away. Please needinfo? Paul Oiegas [:pauloiegasSV]]]

Hi reporter,

Please provide a more simple test case, so I could try to reproduce this on my end. Your provided copy/paste commands from console, is giving syntax errors and I'm not able to reproduce it.

Can you please try to reproduce this on the latest release(43.0.4) and latest Nightly(46.0a1) and provide the results? When doing this, please try to reproduce with a new clean Firefox profile, maybe even in safe mode, as some of this issues may be caused by third party installed add-ons or custom settings(https://support.mozilla.org/en-US/kb/troubleshoot-and-diagnose-firefox-problems).

Thanks,
Paul.

Comment 2

[Paul Pasca[Away. Please needinfo? Paul Oiegas [:pauloiegasSV]]]

Since the reporter didn't provide the requested information, I will mark this issue as RESOLVED INCOMPLETE. If you still encounter this problem, please feel free to reopen this bug, or file a new one.