Tutorial Change Text Selection Color

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/* Mozilla based browsers */
::-moz-selection {
       background-color: #FFA;
       color: #000;
}

/* Works in Safari */
::selection {
       background-color: #FFA;
       color: #000;
}

Tutorial Centering a Website

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<body>
  <div id="page-wrap">
    <!-- all websites HTML here -->
  </div>
</body>
#page-wrap {
     width: 800px;
     margin: 0 auto;
}

Tutorial Center DIV with Dynamic Height

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CSS:

* { margin: 0; padding: 0; }
#page{display:table;overflow:hidden;margin:0px auto;}
*:first-child+html #page {position:relative;}/*ie7*/
* html #page{position:relative;}/*ie6*/

#content_container{display:table-cell;vertical-align: middle;}
*:first-child+html #content_container{position:absolute;top:50%;}/*ie7*/
* html #content_container{position:absolute;top:50%;}/*ie6*/

*:first-child+html #content{position:relative;top:-50%;}/*ie7*/
* html #content{position:relative;top:-50%;}/*ie6*/

html,body{height:100%;}
#page{height:100%;width:465px;}

HTML:

<div id="page">
       <div id="content_container">
               <div id="content">
                     <p>your content</p>
               </div>
       </div>
</div>

Reference URL

Tutorial Browser Specific Hacks

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/***** Selector Hacks ******/

/* IE6 and below */
* html #uno  { color: red }
 
/* IE7 */
*:first-child+html #dos { color: red } 
 
/* IE7, FF, Saf, Opera  */
html>body #tres { color: red }
 
/* IE8, FF, Saf, Opera (Everything but IE 6,7) */
html>/**/body #cuatro { color: red }
 
/* Opera 9.27 and below, safari 2 */
html:first-child #cinco { color: red }
 
/* Safari 2-3 */
html[xmlns*=""] body:last-child #seis { color: red }
 
/* safari 3+, chrome 1+, opera9+, ff 3.5+ */
body:nth-of-type(1) #siete { color: red }
 
/* safari 3+, chrome 1+, opera9+, ff 3.5+ */
body:first-of-type #ocho {  color: red }
 
/* saf3+, chrome1+ */
@media screen and (-webkit-min-device-pixel-ratio:0) {
 #diez  { color: red  }
}
 
/* iPhone / mobile webkit */
@media screen and (max-device-width: 480px) {
 #veintiseis { color: red  }
}
 
/* Safari 2 - 3.1 */
html[xmlns*=""]:root #trece  { color: red  }
 
/* Safari 2 - 3.1, Opera 9.25 */
*|html[xmlns*=""] #catorce { color: red  }
 
/* Everything but IE6-8 */
:root *> #quince { color: red  }
 
/* IE7 */
*+html #dieciocho {  color: red }
 
/* Firefox only. 1+ */
#veinticuatro,  x:-moz-any-link  { color: red }
 
/* Firefox 3.0+ */
#veinticinco,  x:-moz-any-link, x:default  { color: red  }
 
 
 
/***** Attribute Hacks ******/
 
/* IE6 */
#once { _color: blue }
 
/* IE6, IE7 */
#doce { *color: blue; /* or #color: blue */ }
 
/* Everything but IE6 */
#diecisiete { color/**/: blue }
 
/* IE6, IE7, IE8 */
#diecinueve { color: blue\9; }
 
/* IE7, IE8 */
#veinte { color/*\**/: blue\9; }
 
/* IE6, IE7 -- acts as an !important */
#veintesiete { color: blue !ie; } /* string after ! can be anything */

Check out BrowserHacks.com for more.

Tutorial Bouncy Animated Loading Animation

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Just some funzies with CSS3 animations. If you are worried about super deep browser support, use a GIF. 

<div class="loader">
    <span></span>
    <span></span>
    <span></span>
</div>
.loader {
    text-align: center;    
}
.loader span {
    display: inline-block;
    vertical-align: middle;
    width: 10px;
    height: 10px;
    margin: 50px auto;
    background: black;
    border-radius: 50px;
    -webkit-animation: loader 0.9s infinite alternate;
    -moz-animation: loader 0.9s infinite alternate;
}
.loader span:nth-of-type(2) {
    -webkit-animation-delay: 0.3s;
    -moz-animation-delay: 0.3s;
}
.loader span:nth-of-type(3) {
    -webkit-animation-delay: 0.6s;
    -moz-animation-delay: 0.6s;
}
@-webkit-keyframes loader {
  0% {
    width: 10px;
    height: 10px;
    opacity: 0.9;
    -webkit-transform: translateY(0);
  }
  100% {
    width: 24px;
    height: 24px;
    opacity: 0.1;
    -webkit-transform: translateY(-21px);
  }
}
@-moz-keyframes loader {
  0% {
    width: 10px;
    height: 10px;
    opacity: 0.9;
    -moz-transform: translateY(0);
  }
  100% {
    width: 24px;
    height: 24px;
    opacity: 0.1;
    -moz-transform: translateY(-21px);
  }
}

Reference URL

Tutorial Blurry Text

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Make the text color transparent but add a shadow:

.blur {
   color: transparent;
   text-shadow: 0 0 5px rgba(0,0,0,0.5);
}

Blurry

More browsers support color than text-shadow though, so you might want to do feature detection. Or, leave the color property and do enough shadowing that it appears blurry anyway (demo).

Tutorial Better Helvetica

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body {
   font-family: "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; 
   font-weight: 300;
}

Might as well use the nicest Helvetica you can...