Tutorial Useful CSS3 LESS Mixins

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.text-shadow (@string: 0 1px 3px rgba(0, 0, 0, 0.25)) {
	text-shadow: @string;
}
.box-shadow (@string) {
	-webkit-box-shadow: @string;
	-moz-box-shadow:    @string;
	box-shadow:         @string;
}
.drop-shadow (@x: 0, @y: 1px, @blur: 2px, @spread: 0, @alpha: 0.25) {
	-webkit-box-shadow:	@x @y @blur @spread rgba(0, 0, 0, @alpha);
	-moz-box-shadow:	@x @y @blur @spread rgba(0, 0, 0, @alpha);
	box-shadow:		@x @y @blur @spread rgba(0, 0, 0, @alpha);
}
.inner-shadow (@x: 0, @y: 1px, @blur: 2px, @spread: 0, @alpha: 0.25) {
	-webkit-box-shadow: inset @x @y @blur @spread rgba(0, 0, 0, @alpha);
	-moz-box-shadow:    inset @x @y @blur @spread rgba(0, 0, 0, @alpha);
	box-shadow:         inset @x @y @blur @spread rgba(0, 0, 0, @alpha);
}

.box-sizing (@type: border-box) {
	-webkit-box-sizing: @type;
	-moz-box-sizing:    @type;
	box-sizing:         @type;
}

.border-radius (@radius: 5px) {
	-webkit-border-radius: @radius;
	-moz-border-radius:    @radius;
	border-radius:         @radius;

	-moz-background-clip:    padding;
	-webkit-background-clip: padding-box;
	background-clip:         padding-box;
}
.border-radiuses (@topright: 0, @bottomright: 0, @bottomleft: 0, @topleft: 0) {
	-webkit-border-top-right-radius:    @topright;
	-webkit-border-bottom-right-radius: @bottomright;
	-webkit-border-bottom-left-radius:  @bottomleft;
	-webkit-border-top-left-radius:     @topleft;

	-moz-border-radius-topright:        @topright;
	-moz-border-radius-bottomright:     @bottomright;
	-moz-border-radius-bottomleft:      @bottomleft;
	-moz-border-radius-topleft:         @topleft;

	border-top-right-radius:            @topright;
	border-bottom-right-radius:         @bottomright;
	border-bottom-left-radius:          @bottomleft;
	border-top-left-radius:             @topleft;

	-moz-background-clip:    padding; 
	-webkit-background-clip: padding-box; 
	background-clip:         padding-box; 
}

.opacity (@opacity: 0.5) {
	-webkit-opacity: 	@opacity;
	-moz-opacity: 		@opacity;
	opacity: 		@opacity;
}

.gradient (@startColor: #eee, @endColor: white) {
	background-color: @startColor;
	background: -webkit-gradient(linear, left top, left bottom, from(@startColor), to(@endColor));
	background: -webkit-linear-gradient(top, @startColor, @endColor);
	background: -moz-linear-gradient(top, @startColor, @endColor);
	background: -ms-linear-gradient(top, @startColor, @endColor);
	background: -o-linear-gradient(top, @startColor, @endColor);
}
.horizontal-gradient (@startColor: #eee, @endColor: white) {
 	background-color: @startColor;
	background-image: -webkit-gradient(linear, left top, right top, from(@startColor), to(@endColor));
	background-image: -webkit-linear-gradient(left, @startColor, @endColor);
	background-image: -moz-linear-gradient(left, @startColor, @endColor);
	background-image: -ms-linear-gradient(left, @startColor, @endColor);
	background-image: -o-linear-gradient(left, @startColor, @endColor);
}

.animation (@name, @duration: 300ms, @delay: 0, @ease: ease) {
	-webkit-animation: @name @duration @delay @ease;
	-moz-animation:    @name @duration @delay @ease;
	-ms-animation:     @name @duration @delay @ease;
}

.transition (@transition) {
	-webkit-transition: @transition;  
	-moz-transition:    @transition;
	-ms-transition:     @transition; 
	-o-transition:      @transition;  
}
.transform(@string){
	-webkit-transform: @string;
	-moz-transform: 	 @string;
	-ms-transform: 		 @string;
	-o-transform: 		 @string;
}
.scale (@factor) {
	-webkit-transform: scale(@factor);
	-moz-transform: 	 scale(@factor);
	-ms-transform: 		 scale(@factor);
	-o-transform: 		 scale(@factor);
}
.rotate (@deg) {
	-webkit-transform: rotate(@deg);
	-moz-transform: 	 rotate(@deg);
	-ms-transform: 		 rotate(@deg);
	-o-transform: 		 rotate(@deg);
}
.skew (@deg, @deg2) {
	-webkit-transform:       skew(@deg, @deg2);
	-moz-transform: 	 skew(@deg, @deg2);
	-ms-transform: 		 skew(@deg, @deg2);
	-o-transform: 		 skew(@deg, @deg2);
}
.translate (@x, @y:0) {
	-webkit-transform:       translate(@x, @y);
	-moz-transform: 	 translate(@x, @y);
	-ms-transform: 		 translate(@x, @y);
	-o-transform: 		 translate(@x, @y);
}
.translate3d (@x, @y: 0, @z: 0) {
	-webkit-transform:       translate3d(@x, @y, @z);
	-moz-transform: 	 translate3d(@x, @y, @z);
	-ms-transform: 		 translate3d(@x, @y, @z);
	-o-transform: 		 translate3d(@x, @y, @z);
}
.perspective (@value: 1000) {
	-webkit-perspective: 	@value;
	-moz-perspective: 	@value;
	-ms-perspective: 	@value;
	perspective: 		@value;
}
.transform-origin (@x:center, @y:center) {
	-webkit-transform-origin: @x @y;
	-moz-transform-origin:    @x @y;
	-ms-transform-origin:     @x @y;
	-o-transform-origin:      @x @y;
}

Tutorial Two-Color Three-Dimensional Blocks and Text

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We can use multiple text-shadow and box-shadow values to create a three-dimensional look to blocks or text, like this screenshot of David DeSandro's footer. However in that example, the "three dimesional" part is a solid color.

By alternating colors back and forth in the "stacking order" of our box or text shadow declaration, we can simulate a more three dimensional / lighted effect. 

text-shadow:   1px 0px #eee, 0px 1px #ccc,
               2px 1px #eee, 1px 2px #ccc,
               3px 2px #eee, 2px 3px #ccc,
               4px 3px #eee, 3px 4px #ccc,
               5px 4px #eee, 4px 5px #ccc,
               6px 5px #eee, 5px 6px #ccc,
               7px 6px #eee, 6px 7px #ccc,
               8px 7px #eee, 7px 8px #ccc,
               8px 8px #eee;

Example

Reference URL

Tutorial Turn Off Number Input Spinners

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WebKit desktop browsers add little up down arrows to number inputs called spinners. You can turn them off visually like this:

input[type=number]::-webkit-inner-spin-button, 
input[type=number]::-webkit-outer-spin-button { 
  -webkit-appearance: none; 
  margin: 0; 
}

Note that some other functionality still exists, like being able to increment the number via the scroll wheel on a mouse.

Top, on, Bottom, off.

Tutorial Tucked Corners

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<div class="corners">
   Content
</div>
body {
    background: #e6e6e6;
}
.corners { 
    background: #f6f6f6;
    height: 700px;
    margin: 50px auto;
    max-width: 600px;
    position: relative;
    width: 80%;
    -webkit-box-shadow: 0 1px 7px hsla(0,0%,0%,.2);
       -moz-box-shadow: 0 1px 7px hsla(0,0%,0%,.2);
            box-shadow: 0 1px 7px hsla(0,0%,0%,.2);
}
/* Corner Effect */
.corners:after,
.corners:before {
    background: #e6e6e6;
    content: '';
    height: 50px;
    position: absolute;
    top: -25px;
    width: 100px;
    -webkit-box-shadow: 0 5px 10px -7px hsla(0,0%,0%,.5);
       -moz-box-shadow: 0 5px 10px -7px hsla(0,0%,0%,.5);
            box-shadow: 0 5px 10px -7px hsla(0,0%,0%,.5);
}
.corners:after {
    left: -50px;
    -webkit-transform: rotate(-45deg);
       -moz-transform: rotate(-45deg);
        -ms-transform: rotate(-45deg);
         -o-transform: rotate(-45deg);
            transform: rotate(-45deg);
}
.corners:before {
    right: -50px;
    -webkit-transform: rotate(45deg);
       -moz-transform: rotate(45deg);
        -ms-transform: rotate(45deg);
         -o-transform: rotate(45deg);
            transform: rotate(45deg);
}

More robust example including bottom corners at the Reference URL.

Reference URL

Tutorial Truncate String with Ellipsis

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All the following are required, so the text must be in a single straight line that overflows a box where that overflow is hidden.

.truncate {
  width: 250px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

A bunch of more techniques here, including multi-line ellipsis.

Tutorial Triangular List Bullets

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ul {
    margin: 0.75em 0;
    padding: 0 1em;
    list-style: none;
}
li:before { 
    content: "";
    border-color: transparent #111;
    border-style: solid;
    border-width: 0.35em 0 0.35em 0.45em;
    display: block;
    height: 0;
    width: 0;
    left: -1em;
    top: 0.9em;
    position: relative;
}

Reference URL

Tutorial Transparent Inside Border

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<div class="inner-border">
    Transparent Inside Border
</div>
.inner-border {
    background: #000;
    color: #fff;
    margin: 50px;
    padding: 15px;
    position: relative;
}
.inner-border:before {
    border: 5px solid #000;
    content: "";
    position: absolute;
    top: -10px;
    bottom: -10px;
    left: -10px;
    right: -10px;
}

Reference URL