stagger.less

.animationDelay (@delay) { 
	-webkit-animation-delay: @delay;  
	-moz-animation-delay:    @delay;
	-ms-animation-delay:     @delay; 
	-o-animation-delay:      @delay;  
    animation-delay:      @delay; 
}

@interval: .4s; /* Stagger interval */

._1{ .animationDelay(1 * @interval); }
._2{ .animationDelay(2 * @interval); }
._3{ .animationDelay(3 * @interval); }
._4{ .animationDelay(4 * @interval); }
._5{ .animationDelay(5 * @interval); }
._6{ .animationDelay(6 * @interval); }
._7{ .animationDelay(7 * @interval); }
._8{ .animationDelay(8 * @interval); }
._9{ .animationDelay(9 * @interval); }
._10{ .animationDelay(10 * @interval); }

/* You can also add more classes if you need more than 10 */