Last modified: 2013-08-13 11:03:04 UTC
Look at https://www.mediawiki.org/wiki/File:2013-08-02_Thanks_extension_dialog.png The 'x' close icon looks like a cursive smear. This was taken in Firefox 22 on Ubuntu 13.04, I reproduced with Firefox 22 on Windows 7. It's the stock jQuery UI close background image for Vector, https://bits.wikimedia.org/static-1.22wmf12/resources/jquery.ui/themes/vector/images/close.png , which appears to be a completely symmetrical x shape. If you bring up this dialog (login, visit a wiki page, View history, and thank someone), and zoom in (Ctrl-+) several times, the dialog's close icon resolves into a normal (pixelated but straight-edged) 'x'. And if you zoom out you will see it snap to its normal size. This may simply be crummy Firefox image resizing behavior, since Chromium doesn't mangle the 'x' so badly at any zoom. But if you display the image alone in Firefox and zoom in and out it doesn't look as bad as when the image acts as a CSS background. The CSS for the background image looks straightforward, I don't see any obvious errors in it. Adding a 1-pixel alpha border to the icon png might entice Firefox to resize it cleanly. Or we could just use the Unicode symbol × '×' as PostEdit does, and avoid pixels altogether. Bug 48067 is the general inconsistency of MediaWiki close icons.
