In some GTK+ themes, in particular Adwaita, toggle buttons that are larger than the default size do not render properly. See the attached HTML and screenshot.
Created attachment 134964 [details]
Created attachment 134966 [details]
Screenshot of the issue
Created attachment 134976 [details]
Attachment 134976 [details] did not pass style-queue:
Failed to run "['Tools/Scripts/check-webkit-style', '--diff-files', u'LayoutTests/ChangeLog', u'LayoutTests/plat..." exit_code: 1
Source/WebCore/platform/gtk/RenderThemeGtk3.cpp:231: Use 0 instead of NULL. [readability/null] 
Total errors found: 1 in 6 files
If any of these errors are false positives, please file a bug against check-webkit-style.
Comment on attachment 134976 [details]
Clearing flags on attachment: 134976
Committed r113601: <http://trac.webkit.org/changeset/113601>
All reviewed patches have been landed. Closing bug.