Background color of the current check box is transparent, and the color of the check mark is black.
So when the background is black, check mark cannot be distinguished.
Check box theme should be changed.
Created attachment 168662 [details]
test checkbox status with white and black background.
Created attachment 168664 [details]
Comment on attachment 168664 [details]
Adding background color to the theme image will be better because check box image can have round edge.
Created attachment 168667 [details]
Comment on attachment 168667 [details]
Clearing flags on attachment: 168667
Committed r131576: <http://trac.webkit.org/changeset/131576>
All reviewed patches have been landed. Closing bug.