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CSS

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HTML 

              
                <article id="article">
		<aside id="sidebar">
			<form id="data" action="http://apps.eky.hk/css-triangle-generator" method="get">
				<fieldset id="fieldset-direction">
					<legend id="legend-direction">Direction</legend>
					<ul id="direction1" class="directions">
						<li>
							<input type="radio" name="direction" id="direction-top" value="top" checked />
								<label for="direction-top">Top</label>
						<li>
							<input type="radio" name="direction" id="direction-right" value="right" />
								<label for="direction-right">Right</label>
						<li>
							<input type="radio" name="direction" id="direction-bottom" value="bottom" />
								<label for="direction-bottom">Bottom</label>
						<li>
							<label for="direction-left">Left</label>
								<input type="radio" name="direction" id="direction-left" value="left" />
					</ul>
					<ul id="direction2" class="directions">
						<li>
							<input type="radio" name="direction" id="direction-topRight" value="topRight" />
								<label for="direction-topRight">Top right</label>
						<li>
							<input type="radio" name="direction" id="direction-bottomRight" value="bottomRight" />
								<label for="direction-bottomRight">Bottom right</label>
						<li>
							<label for="direction-bottomLeft">Bottom left</label>
								<input type="radio" name="direction" id="direction-bottomLeft" value="bottomLeft" />
						<li>
							<label for="direction-topLeft">Top left</label>
								<input type="radio" name="direction" id="direction-topLeft" value="topLeft" />
					</ul>
					<div role="img" id="triangleDirection" class="selected-top">
						<div class="corners">
							<label for="direction-topRight" class="triangle topRight"></label>
							<label for="direction-bottomRight" class="triangle bottomRight"></label>
							<label for="direction-bottomLeft" class="triangle bottomLeft"></label>
							<label for="direction-topLeft" class="triangle topLeft"></label>
						</div>
						<div class="corners rotate-45">
							<label for="direction-top" class="triangle top"></label>
							<label for="direction-bottom" class="triangle bottom"></label>
							<label for="direction-right" class="triangle right"></label>
							<label for="direction-left" class="triangle left"></label>
						</div>
						<div role="img" id="centerFill"></div>
					</div>
				</fieldset>
				<fieldset id="fieldset-type">
					<legend id="legend-type">Type</legend>
					<input type="checkbox" name="ie6" id="ie6" value="support" />
						<label for="ie6">IE6 support (add chroma filter)</label>
					<ul>
						<li id="equilateral">
							<input type="radio" name="type" id="type-equ" value="equ" />
								<label for="type-equ">Equilateral</label>
						<li>
							<input type="radio" name="type" id="type-iso" value="iso" checked />
								<label for="type-iso">Isosceles</label>
						<li>
							<input type="radio" name="type" id="type-sca" value="sca" />
								<label for="type-sca">Scalene</label>
					</ul>
				</fieldset>
				<fieldset id="fieldset-size">
					<legend id="legend-size">Size</legend>
					<ul>
						<li>
							<label for="width">Width</label>
							<input name="width" id="width" value="200" type="number" />px
							<ul>
								<li>
									<label for="width-left">Left</label>
									<input name="width-left" id="width-left" value="100" type="number" />px
								<li>
									<label for="width-right">Right</label>
									<input name="width-right" id="width-right" value="100" type="number" />px
							</ul>
						</li>
						<li>
							<label for="height">Height</label>
							<input name="height" id="height" value="100" type="number" />px
							<ul>
								<li>
									<label for="height-top">Top</label>
									<input name="height-top" id="height-top" value="50" type="number" />px
								<li>
									<label for="height-bottom">Bottom</label>
									<input name="height-bottom" id="height-bottom" value="50" type="number" />px
							</ul>
						</li>
					</ul>
				</fieldset>
				<fieldset>
					<legend id="legend-color">Color</legend>
					<input name="color" id="color" type="color" value="#007bff" />
					<div id="colorPicker"></div>
				</fieldset>
				<input id="update" name="update" type="submit" value="Update" />
			</form>
		</aside>
		<div id="workArea">
			<div id="triangleOutput">
				<div id="triangle"></div>
			</div>
			<div id="cssOutput">
				<h1>CSS</h1>
				<textarea id="css" rows="8" cols="100">width: 0;
height: 0;
border-style: solid;
border-width: 0 100px 100px 100px;
border-color: transparent transparent #007bff transparent;</textarea>
			</div>
			<div id="tips">
				<h1>Tips</h1>
				<ul>
					<li>Try <code>border-style: inset</code> if Firefox renders a strange gray border
					<li>Add <code>-webkit-transform:rotate(360deg)</code> for a better anti-aliasing in webkit browser
				</ul>
			</div>
					</div>
	</article>
!

CSS 

              
                body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,fieldset,input,textarea,p,blockquote,th,td { 
	margin:0;
	padding:0;
}
table {
	border-collapse:collapse;
	border-spacing:0;
}
fieldset,img { 
	border:0;
}
address,caption,cite,code,dfn,em,strong,th,var {
	font-style:normal;
	font-weight:normal;
}
ol,ul {
	list-style:none;
}
caption,th {
	text-align:left;
}
q:before,q:after {
	content:'';
}
abbr,acronym { border:0;}
article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section {
	display: block;
}
html.full, html.full body {
	font-family:Corbel, 'MS PGothic', 'Microsoft JhengHei', Arial, Verdana, Helvetica, sans-serif;
}
input, select, textarea{
	font-family:Arial, Verdana, Helvetica, sans-serif;
}
a{
	color:#197882;
	text-decoration:none;
}
.clearfix:after { content: "."; display:block; height:0px; clear:both; visibility:hidden; }
.clearfix { zoom:1 \9; display:block; }

hr{
	border:1px #666 solid;
	width:100%;
	margin:20px 0;
}
#top{
	width:100%;
	height:90%;
	position:relative;
	overflow:auto;
}
#header{
	height:65px;
	width:100%;
	background:#eee;
	position:relative;
	padding:10px 0 20px;
}
#header .title{
	font-size:36px;
	text-align:center;
}
#header #subTitle{
	font-size:18px;
	text-align:center;
}
#social{
	font-size:24px;
	position:absolute;
	right:20px;
	top:0px;
	width:50px;
	height:200px;
	color:#666;
}
#social .fb-like{
	position:absolute;
	top:0;
}
#social .fb-like > span{
	position:absolute !important;
	top:45px;
	height:30px !important;
}
#social .twitter-share-button{
	position:absolute !important;
	top:0px;
	padding-top:0px;
}
#___plusone_0{
	position:absolute !important;
	top:27px;
	padding-left:5px;
	padding-top:5px;
}

#footer{
	height:90px;
	width:100%;
	background:#eee;
	overflow:hidden;
	position:relative;
	clear:both;
}
html.full #footer{
	bottom:0;
	left:0;
	position:absolute;
}
#footer .title{
	display:block;
	font-size:24px;
	position:absolute;
	right:20px;
	top:30%;
	color:#666;
}
#footer .title a{
	color:#666;
}
#HTML5Logo{
	font-size:24px;
	position:absolute;
	left:20px;
	top:15%;
	color:#666;
}
.infoList{
	padding-top:20px;
	width:720px;
	margin:0 auto;
}
.infoList li{
	display:inline-block;
	vertical-align:top;
	margin-right:20px;
}
.infoSublist{
	margin-left:10px;
}
.infoSublist li{
	font-size:12px;
	display:inline-block;
}
.infoSublist.browserList{
	width:350px;
}
.infoSublist.verticalList li{
	display:block;
}
.colorpicker {
	width: 356px;
	height: 176px;
	overflow: hidden;
	position: absolute;
	background: url(../images/colorpicker_background.png);
	font-family: Arial, Helvetica, sans-serif;
	display: none;
}
.colorpicker_color {
	width: 150px;
	height: 150px;
	left: 14px;
	top: 13px;
	position: absolute;
	background: #f00;
	overflow: hidden;
	cursor: crosshair;
}
.colorpicker_color div {
	position: absolute;
	top: 0;
	left: 0;
	width: 150px;
	height: 150px;
	background: url(../images/colorpicker_overlay.png);
}
.colorpicker_color div div {
	position: absolute;
	top: 0;
	left: 0;
	width: 11px;
	height: 11px;
	overflow: hidden;
	background: url(../images/colorpicker_select.gif);
	margin: -5px 0 0 -5px;
}
.colorpicker_hue {
	position: absolute;
	top: 13px;
	left: 171px;
	width: 35px;
	height: 150px;
	cursor: n-resize;
}
.colorpicker_hue div {
	position: absolute;
	width: 35px;
	height: 9px;
	overflow: hidden;
	background: url(../images/colorpicker_indic.gif) left top;
	margin: -4px 0 0 0;
	left: 0px;
}
.colorpicker_new_color {
	position: absolute;
	width: 60px;
	height: 30px;
	left: 213px;
	top: 13px;
	background: #f00;
}
.colorpicker_current_color {
	position: absolute;
	width: 60px;
	height: 30px;
	left: 283px;
	top: 13px;
	background: #f00;
}
.colorpicker input {
	background-color: transparent;
	border: 1px solid transparent;
	position: absolute;
	font-size: 10px;
	font-family: Arial, Helvetica, sans-serif;
	color: #898989;
	top: 4px;
	right: 11px;
	text-align: right;
	margin: 0;
	padding: 0;
	height: 11px;
}
.colorpicker_hex {
	position: absolute;
	width: 72px;
	height: 22px;
	background: url(../images/colorpicker_hex.png) top;
	left: 212px;
	top: 142px;
}
.colorpicker_hex input {
	right: 6px;
}
.colorpicker_field {
	height: 22px;
	width: 62px;
	background-position: top;
	position: absolute;
}
.colorpicker_field span {
	position: absolute;
	width: 12px;
	height: 22px;
	overflow: hidden;
	top: 0;
	right: 0;
	cursor: n-resize;
}
.colorpicker_rgb_r {
	background-image: url(../images/colorpicker_rgb_r.png);
	top: 52px;
	left: 212px;
}
.colorpicker_rgb_g {
	background-image: url(../images/colorpicker_rgb_g.png);
	top: 82px;
	left: 212px;
}
.colorpicker_rgb_b {
	background-image: url(../images/colorpicker_rgb_b.png);
	top: 112px;
	left: 212px;
}
.colorpicker_hsb_h {
	background-image: url(../images/colorpicker_hsb_h.png);
	top: 52px;
	left: 282px;
}
.colorpicker_hsb_s {
	background-image: url(../images/colorpicker_hsb_s.png);
	top: 82px;
	left: 282px;
}
.colorpicker_hsb_b {
	background-image: url(../images/colorpicker_hsb_b.png);
	top: 112px;
	left: 282px;
}
.colorpicker_submit {
	position: absolute;
	width: 22px;
	height: 22px;
	background: url(../images/colorpicker_submit.png) top;
	left: 322px;
	top: 142px;
	overflow: hidden;
}
.colorpicker_focus {
	background-position: center;
}
.colorpicker_hex.colorpicker_focus {
	background-position: bottom;
}
.colorpicker_submit.colorpicker_focus {
	background-position: bottom;
}
.colorpicker_slider {
	background-position: bottom;
}html{
	display:block !important;
}
#headerInner{
	width:780px;
	margin:0 auto;
	position:relative;
}
#locales{
	position:absolute;
	right:80px;
	top:0px;
}
#locales li{
	list-style:none;
	line-height:12px;
}
#locales li a{
	font-size:12px;
}
:disabled{
	background:#ddd;
	color:#666
}
#title{
	font-size:24px;
	padding:10px 0;
	text-align:center;
}
#article{
	width:760px;
	margin:0 auto;
}
#sidebar{
	width:380px;
	padding:0 10px;
	height:100%;
	background:#eee;
	float:left;
	overflow:auto;
}
#workArea{
	margin-left:400px;
	height:100%;
	width:380px;
}
#triangleOutput{
	display:block;
	min-height:300px;
	min-width:380px;
	background:url('transparent.png') 0 0 repeat;
}
#cssOutput{
	display:block;
	width:380px;
	height:150px;
	background:#fff;
	position:relative;
	padding-left:10px;
}
#cssOutput h1{
	font-size:24px;
	height:24px;
	text-indent:4px;
}
#css{
	width:370px;
	margin-top:10px;
	height:100px;
	border:0;
}
#tips{
	margin-bottom:20px;
}
#tips ul{
	margin-left:30px;
}
#tips li, #tips code{
	font-size:12px;
	list-style:disc;
}
#tips code{
	color:#592052;
}
#tips h1{
	font-size:24px;
	text-indent:14px;
}

#triangle{
	/* 
		Bug in Chrome 18+ and Safari 5.1.2+
		- http://labs.eky.hk/bug/webkit-border-width-transition/
		- https://bugs.webkit.org/show_bug.cgi?id=77560
		
		-webkit-transition:.3s;
	*/
	-moz-transition:.3s;
	-ms-transition:.3s;
	-o-transition:.3s;
	transition:.3s;
	border-style: solid;
	width: 0px;
	height: 0px;
	line-height: 0px;
	border-width: 0px 100px 100px 100px;
	border-color: transparent transparent #007bff transparent;
	_border-color: #000 #000 #007bff #000;
	_filter:progid:DXImageTransform.Microsoft.Chroma(color='#000000');
}
#data{

}
#data legend{
	font-size:24px;
}
#data fieldset{
	padding:10px;
	padding-right:0;
}
#data li{
	list-style:none;
}

#fieldset-direction{
	position:relative;
}
#direction1{
	float:left;
	width:120px;
}
#direction2{
	float:left;
}

#fieldset-type li{
	float:left;
	margin-right:20px;
}

#fieldset-size label,
#fieldset-size input{
	display:block;
	float:left;
}
#fieldset-size label{
	width:70px;
}
#fieldset-size ul{
	margin-left:20px;
}
#fieldset-size > ul{
	margin-left:0;
}
#fieldset-size li{
	clear:both;
}

.js #color{
	position:absolute;
	top:-100000px;
	left:-100000px;
}

#update{
	padding:10px;
	font-size:24px;
	margin:10px auto;
	display:block;
	width:100px;
	cursor:pointer;
}

:root #direction1,
:root #direction2{
	width:300px;
}

:root #direction1,
:root #direction1 li,
:root #direction2,
:root #direction2 li{
	position:absolute;
}
#direction1 li:nth-child(1){
	top:0;
	left:110px;
}
#direction1 li:nth-child(2){
	top:50px;
	left:180px;
}
#direction1 li:nth-child(3){
	top:100px;
	left:110px;
}
#direction1 li:nth-child(4){
	top:50px;
	left:40px;
}
#direction2 li:nth-child(1){
	top:20px;
	left:170px;
}
#direction2 li:nth-child(2){
	top:80px;
	left:170px;
}
#direction2 li:nth-child(3){
	top:80px;
	right:205px;
}
#direction2 li:nth-child(4){
	top:20px;
	right:205px;
}

#triangleDirection{
	display:none;
	position:relative;
}
:root #triangleDirection{
	display:block;
	clear:both;
	position:relative;
	width:70px;
	height:45px;
	margin:30px 0 50px 100px;
}
.corners{
	position:absolute;
	top:0;
	left:0;
	width:60px;
	height:60px;
}
.corners.rotate-45{
	width:54px;
	height:54px;
	margin:4px 0 0 4px;
	-webkit-transform:rotate(-45deg);
	-moz-transform:rotate(-45deg);
	-ms-transform:rotate(-45deg);
	-o-transform:rotate(-45deg);
	transform:rotate(-45deg);
}
.corners > label{
	position:absolute;
	width:30px;
	height:30px;
	background:#0094FF;
	cursor:pointer;
}
.corners.rotate-45 > label{
	width:27px;
	height:27px;
	background:#77F1FF;
}
.corners > label:hover{
	background:#FF77F1;
}
.corners .topRight,
.corners .top{
	top:0;
	right:0;
}
.corners .bottomRight,
.corners .right{
	bottom:0;
	right:0;
}
.corners .bottomLeft,
.corners .bottom{
	bottom:0;
	left:0;
}
.corners .topLeft,
.corners .left{
	top:0;
	left:0;
}
#centerFill{
	position:absolute;
	top:12px;
	left:12px;
	width:38px;
	height:38px;
	background:#fff;
}
.selected-top .triangle.top,
.selected-bottom .triangle.bottom,
.selected-left .triangle.left,
.selected-right .triangle.right,
.selected-topRight .triangle.topRight,
.selected-bottomRight .triangle.bottomRight,
.selected-bottomLeft .triangle.bottomLeft,
.selected-topLeft .triangle.topLeft{
	background:#FF77F1;
}
!

JS 

              
                //http://apps.eky.hk/css-triangle-generator/
!
999px

Console