Tutorial Cross-Browser hr Styling

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For regular browsers

hr {
       border : 0;
       height : 15px;
       background : url(hr.gif) 50% 0 no-repeat;
       margin : 1em 0;
       }

For IE < 8 (use conditional stylesheets)

hr {
       display : list-item;
       list-style : url(hr.gif) inside;
       filter : alpha(opacity=0);
       width : 0;
       }

Reference URL

Tutorial Cross Browser Opacity

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.transparent_class {
  /* IE 8 */
  -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";

  /* IE 5-7 */
  filter: alpha(opacity=50);

  /* Netscape */
  -moz-opacity: 0.5;

  /* Safari 1.x */
  -khtml-opacity: 0.5;

  /* Good browsers */
  opacity: 0.5;
}

Tutorial Cross Browser Inline-Block

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li {
        width: 200px;
        min-height: 250px;
        border: 1px solid #000;
        display: -moz-inline-stack;
        display: inline-block;
        vertical-align: top;
        margin: 5px;
        zoom: 1;
        *display: inline;
        _height: 250px;
}

Reference/Explanation here and here.

Tutorial Corner Ribbon

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<div class="wrapper">
       <div class="ribbon-wrapper-green"><div class="ribbon-green">NEWS</div></div>
</div>​
.wrapper {
  margin: 50px auto;
  width: 280px;
  height: 370px;
  background: white;
  border-radius: 10px;
  -webkit-box-shadow: 0px 0px 8px rgba(0,0,0,0.3);
  -moz-box-shadow:    0px 0px 8px rgba(0,0,0,0.3);
  box-shadow:         0px 0px 8px rgba(0,0,0,0.3);
  position: relative;
  z-index: 90;
}

.ribbon-wrapper-green {
  width: 85px;
  height: 88px;
  overflow: hidden;
  position: absolute;
  top: -3px;
  right: -3px;
}

.ribbon-green {
  font: bold 15px Sans-Serif;
  color: #333;
  text-align: center;
  text-shadow: rgba(255,255,255,0.5) 0px 1px 0px;
  -webkit-transform: rotate(45deg);
  -moz-transform:    rotate(45deg);
  -ms-transform:     rotate(45deg);
  -o-transform:      rotate(45deg);
  position: relative;
  padding: 7px 0;
  left: -5px;
  top: 15px;
  width: 120px;
  background-color: #BFDC7A;
  background-image: -webkit-gradient(linear, left top, left bottom, from(#BFDC7A), to(#8EBF45)); 
  background-image: -webkit-linear-gradient(top, #BFDC7A, #8EBF45); 
  background-image:    -moz-linear-gradient(top, #BFDC7A, #8EBF45); 
  background-image:     -ms-linear-gradient(top, #BFDC7A, #8EBF45); 
  background-image:      -o-linear-gradient(top, #BFDC7A, #8EBF45); 
  color: #6a6340;
  -webkit-box-shadow: 0px 0px 3px rgba(0,0,0,0.3);
  -moz-box-shadow:    0px 0px 3px rgba(0,0,0,0.3);
  box-shadow:         0px 0px 3px rgba(0,0,0,0.3);
}

.ribbon-green:before, .ribbon-green:after {
  content: "";
  border-top:   3px solid #6e8900;   
  border-left:  3px solid transparent;
  border-right: 3px solid transparent;
  position:absolute;
  bottom: -3px;
}

.ribbon-green:before {
  left: 0;
}
.ribbon-green:after {
  right: 0;
}​

Reference URL

Tutorial Compress CSS with PHP

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Start your CSS files with this PHP (and name it style.php):

<?php
    ob_start ("ob_gzhandler");
    header("Content-type: text/css; charset: UTF-8");
    header("Cache-Control: must-revalidate");
    $offset = 60 * 60 ;
    $ExpStr = "Expires: " .
    gmdate("D, d M Y H:i:s",
    time() + $offset) . " GMT";
    header($ExpStr);
?>

body { color: red; }

Then call your CSS with the PHP file name:

<link rel='stylesheet' type='text/css' href='css/style.php' />

Tutorial Common Unicode Icons

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a[href^="mailto:"]:before { content: "\2709"; }
.phone:before             { content: "\2706"; }
.important:before         { content: "\27BD"; }
blockquote:before         { content: "\275D"; }
blockquote:after          { content: "\275E"; }
.alert:before             { content: "\26A0"; }
<p>
  <a href="mailto:chriscoyier@gmail.com">
    chriscoyier@gmail.com
  </a>
</p>

<p class="phone">
    555-555-5555
</p>

<p class="important">
  REMEMBER: drink slushies too fast.
</p>

<blockquote>
   Designers tend to whisper, ad agencies tend to shout.
</blockquote>

<p class="alert">
   Stranger Danger!
<p>

Reference URL

Tutorial Comments in CSS

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body {
    font-size: 62.5%  /* 1em = 10px */
}

The stuff inside the /* */ marks are CSS comments. This allows you to enter notes into CSS that will not be interpreted. In this case, this comment lets someone reading the CSS file know that that particular line of CSS was intended to allow for using ems to set font size later in the CSS in a more intuitive base 10 way.