与border不得不说的故事

1.border-radius: 50px / 100px; /* horizontal radius, vertical radius */

which is mean to

border-top-left-radius: 50px 100px;

2.<pre>

.arrow {

</pre>

/* 
   Speech Bubbles
   Usage: Apply a class of .speech-bubble and .speech-bubble-DIRECTION

*/
 
.speech-bubble {
  position: relative;
  background-color: #292929;
 
  width: 200px;
  height: 150px;
  line-height: 150px; /* vertically center */
 
  color: white;
  text-align: center;
  border-radius: 10px;
 
  font-family: sans-serif;
}
 
.speech-bubble:after {
  content: ‘‘;
  position: absolute;
 
  width: 0;
  height: 0;
 
  border: 15px solid;
}
 
 
/* Position the Arrow */
 
.speech-bubble-top:after {
  border-bottom-color: #292929;
 
  left: 50%;
  bottom: 100%;
  margin-left: -15px;   
}
.speech-bubble-right:after {
  border-left-color: #292929;
 
  left: 100%;
  top: 50%;
  margin-top: -15px;    
}
 
.speech-bubble-bottom:after {
  border-top-color: #292929;
 
  top: 100%;
  left: 50%;
  margin-left: -15px;   
}
 
.speech-bubble-left:after {
  border-right-color: #292929;
 
  top: 50%;
  right: 100%;
  margin-top: -15px;    
}

与border不得不说的故事

原文：http://www.cnblogs.com/JackyKun/p/5256499.html