Source: dist/css/library_boot.css, line 6807
6.2.6 Sub Grid Filler
This is a styleguide only element to show structure edges.
Example
Default styling
Grid Area:
<div class="w_auto h_100p c_success-n4 font_xbold font_3 br_dotted br_success bg_success-5 br_1 grid items_center justify_center lh_0 overflow_ellipsis">Grid Area: </div>