1596765 - Scrollbar color glitch on certain site

Status: RESOLVED WONTFIX

(Core :: Widget: Win32, defect)

Description

[Alice0775 White]

Attachment: screenshot Nightly VS Beta

Reproducible : 100%

Steps To Reproduce:

1. Open http://www.getginger.jp/

Actual Results:
Scrollbar color is black
See attached screenshot

Expected Results:
Scrollbar color is gray

Regression window:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=d68244d4b2dc69acbd0d6f0d4620089a6ffeef8c&tochange=9f72a5a0105dffe5eed579f1af4c6e6cf84f49cb

Comment 1

[Alice0775 White]

Attachment: testcase html

Comment 2

[Xidorn Quan [:xidorn] UTC+10]

Attachment: screenshot on Safari

I tend to say this is either INVALID or WONTFIX.

The page is using a dark background-color with a light background image, which misleads the heuristic of dark background detection.

To fix this, we would have to regress the experience on real dark website (showing light scrollbars on them) fixed by bug 1578377.

The site should really make their background-color match their background image, otherwise they could have accessibility issue when the image fails to load somehow or is disabled.

The attached screenshot is this site on Safari without overlay scrollbar (default when you have mouse), you can see it has similar issue. Also overlay scrollbar of this site on macOS is also hardly usable as it lacks contrast.

Comment 3

[Alice0775 White]

Also affect https://addons.mozilla.org/en-US/firefox/language-tools/

That seems to ignore an OS theme(desktop application scroll widget).