1439516 - The canvases are blank on https://mangara.github.io/Color-Zebra/

Status: RESOLVED INVALID

(Core :: JavaScript Engine, defect)

Description

[roxleitan]

Attachment: canvas2d.png

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.0) Gecko/20100101 Firefox/60.0
Build ID: 20180219100221

[Affected versions]:
Nightly 60.0a1, Firefox Release 58.0.2 , Beta 59.0b10

[Affected platforms]:
Windows 10 x64

[Steps to reproduce]:
1.Launch Firefox with a new profile
2.Go to https://mangara.github.io/Color-Zebra/

[Expected result]:
All canvases should be correctly displayed(with colours)

[Actual result]:
All canvases are blank.(please see the attached screenshot)

Comment 1

[Sotaro Ikeda [:sotaro]]

I succeeded to reproduce the problem.

Comment 2

[Sotaro Ikeda [:sotaro]]

:milan, can we have p1 priority to this bug? The bug is similar to Bug 1436466.

Comment 3

[Sotaro Ikeda [:sotaro]]

Hmm, this bug might be a non graphics bug. When the problem happened HTMLCanvasElement::CreateContext() was called only for one HTMLCanvasElement and only one CanvasRenderingContext2D was created. And I saw the following error when the problem happen.

 > JavaScript error: https://mangara.github.io/Color-Zebra/all.js, line 1: TypeError: f is null

Comment 4

[Sotaro Ikeda [:sotaro]]

As in Bug 1436466 Comment 23 , sometimes the page is correctly displayed after refresh. Once the page was displayed, I did not saw the problem until launched Firefox with a new profile.

When the problem did not happen I did not saw JavaScript error in console.

Comment 5

[Sotaro Ikeda [:sotaro]]

Changed component to "JavaScript Engine", since the problem seemed to be triggered by JavaScript error as in Comment 3.

Comment 6

[Sander Verdonschot]

This is not a Firefox bug. The JavaScript on the site crashes for certain page widths, and it just so happens that the default width of a new profile's Firefox window is one of the bad values. This happens on Chrome as well.

Comment 7

[Jason Orendorff [:jorendorff]]

Thanks. Closing the bug with the status "invalid", which just means it's not a Firefox bug.