styles/xf.utilities.less (11 lines of code) (raw):
/* non-semantic helper classes
========================================================================== */
/* prevent callout */
.nocallout {-webkit-touch-callout: none;}
/* A workaround for S60 3.x and 5.0 devices which do not animated gif images if they have been set as display: none */
.gifhidden {position: absolute; left: -100%;}
/* For image replacement */
.ir { display: block; border: 0; text-indent: -999em; overflow: hidden; background-color: transparent; background-repeat: no-repeat; text-align: left; direction: ltr; }
.ir br { display: none; }
/* Hide from both screenreaders and browsers: h5bp.com/u */
.hidden { display: none !important; visibility: hidden; }
/* Hide only visually, but have it available for screenreaders: h5bp.com/v */
.visuallyhidden { border: 0; clip: rect(0 0 0 0); height: 1px; margin: -1px; overflow: hidden; padding: 0; position: absolute; width: 1px; }
/* Extends the .visuallyhidden class to allow the element to be focusable when navigated to via the keyboard: h5bp.com/p */
.visuallyhidden.focusable:active, .visuallyhidden.focusable:focus { clip: auto; height: auto; margin: 0; overflow: visible; position: static; width: auto; }
/* Hide visually and from screenreaders, but maintain layout */
.invisible { visibility: hidden; }
/* Contain floats: h5bp.com/q */
.clearfix:before, .clearfix:after { content: ""; display: table; }
.clearfix:after { clear: both; }
* + html .clearfix { *zoom: 1; }