791068 - Invalid conditional attribution

Status: RESOLVED WORKSFORME

(Firefox :: Untriaged, defect)

Description

[Rodrigo Carvalho]

Attachment: html5-mock.js

User Agent: Mozilla/5.0 (Windows NT 6.1; rv:15.0) Gecko/20100101 Firefox/15.0.1
Build ID: 20120905151427

Steps to reproduce:

I have the following Javascript that I use to "mock" some HTML5 features on my testing environment:

if (navigator.userAgent === 'JWebUnit') {
	var Worker = function() {
		this.postMessage = function(obj) {
			var result = {
				data: {
					hash: '122121212121212212'
				}	
			};
			this.onmessage(result);
		};
	};
	Object.prototype.size = function() { return 99; };
	Object.prototype.slice = function(inicio, fim) { return this; };
}


Actual results:

When I run my application on Firefox 15.0.1, the "Worker" function becomes "undefined". If I comment the lines that that make the attibution to "Worker", the application runs fine.

This problem only happens when this .js file is loaded. If I run "alert(typeof(Worker));" before this file is loaded, it shows "function" instead of "undefined"

This problem doesn't happen on Firefox 10 or Chrome 21.


Expected results:

It should not "override" the "Worker" function on Firefox 15, only on my testing environment.

Comment 1

[Matthias Versen [:Matti]]

Could you please attach a full testcase that can be directly run in the browser ?

Comment 2

[Rodrigo Carvalho]

Attachment: HTML file that reproduces the error

Comment 3

[Rodrigo Carvalho]

Attachment: HTML file with the script with the conditional attribution commented (works fine)

Comment 4

[Rodrigo Carvalho]

Attachment: HTML file with the most bizarre case (see the comments inside the file)

Comment 5

[Rodrigo Carvalho]

Hi, Matthias

I've just created 3 simple HTML files, each one is a testcase.

Let me know if you need something else.

Regards.

Comment 6

[Matthias Versen [:Matti]]

Attachment: HTML file that reproduces the error (modified to use the bugzilla JS)

Comment 7

[Matthias Versen [:Matti]]

I get "function" with Seamonkey trunk and I can reproduce this with Firefox15.0.1
Is this already fixed ?

I used https://bugzilla.mozilla.org/attachment.cgi?id=660973 for my test

Comment 8

[Matthias Versen [:Matti]]

I always get "function" with the testcase and Firefox16beta.
This should be fixed in FF16, marking worksforme

Reporter: Thanks for the bug report and the testcase !

Comment 9

[Rodrigo Carvalho]

No problem, Matthias. It is my pleasure to help Firefox to be best browser out there! I hope this problem doesn't affects nobody else until FF16 is out.

Regards,

Rodrigo