Simple gray checker structure on transparent background, blocks are 8 pixels wide.
This is intended to be used by CSS styles on commons and maybe other projects. It meight be referenced from global and/or user CSS files.
<a href="//commons.wikimedia.org/wiki/User:Arnomane" title="User:Arnomane">Arnomane</a>
<span class="int-own-work" lang="en">Own work</span>