343940 - Uncatchable "Permission denied to set property Window.String" involving javascript: URL as a background image

Status: RESOLVED WORKSFORME

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

Description

[Jesse Ruderman]

Testcase 1 causes an uncatchable exception.  I imagine there are several things going wrong:

1) The javascript: URL set as a td's background is evaluated at a strange time -- during or right after an appendChild call.

2) When the javascript: URL is evaluated, it's given an incorrect principal or context, resulting in a simple String.fromCharCode call giving "Permission denied to set property Window.String".

3) That error is allowed to affect the execution of a separate, already-running script.

I could be way off, of course -- I don't know Gecko that well ;)

Testcase 2 uses a <xul:vbox> where testcase 1 uses a <xul:textbox>, and somehow that makes the exception catchable.

Comment 1

[Jesse Ruderman]

Attachment: testcase 1 - uncatchable exception

Comment 2

[Jesse Ruderman]

Attachment: testcase 2 - catchable exception

Comment 3

[Jesse Ruderman]

These testcases put pass/fail information in the status bar using JavaScript, so they'll make the most sense if you allow JavaScript to set status bar text (Firefox disallows it by default).

Comment 4

[Boris Zbarsky [:bzbarsky]]

Is this still an issue?

Comment 5

[Jesse Ruderman]

WFM, both testcases say "pass" in the status bar.