.wrapper span {
display:block;
/*-webkit-transform: skew(45deg)*/
/*-moz-transform: skew(45deg)*/
transform:skew(-45deg)
}
                display:block;
/*-webkit-transform: skew(45deg)*/
/*-moz-transform: skew(45deg)*/
transform:skew(-45deg)
}
                    
                    2017-12-26
                
            .columns {
padding: 5px;
border: 1px solid green;
width: 920px;
height:270px;
margin: 20px auto;
  
-webkit-column-count:2;
-moz-column-count:2;
-o-column-count:2;
-ms-column-count:2;
column-count:2;
}
                padding: 5px;
border: 1px solid green;
width: 920px;
height:270px;
margin: 20px auto;
-webkit-column-count:2;
-moz-column-count:2;
-o-column-count:2;
-ms-column-count:2;
column-count:2;
}
                    
                    2017-12-25
                
            总结下,CSS3中的三种动画:tranform形变动画/transition缓动动画/animation逐帧动画;
tranform: rotate旋转/skew扭曲/scale缩放/translate移动/matrix矩阵变形;
transition: property duration timing-function delay;
animation: KeyframesName duration timing-function delay iteration-count direction play-state fill-mode;
                tranform: rotate旋转/skew扭曲/scale缩放/translate移动/matrix矩阵变形;
transition: property duration timing-function delay;
animation: KeyframesName duration timing-function delay iteration-count direction play-state fill-mode;
                    
                    2017-12-23
                
            产生3d翻转动画效果的是这三样式以及对应的transition配合:
.three-d:not(.active):hover .three-d-box {
transform: translateZ(-25px) rotateX(90deg);
}
.front {
transform: rotatex(0deg) translatez(25px);
}
.back {
transform: rotatex(-90deg) translatez(25px);
}
以及很关键的transform-style: preserve-3d; perspective: 200px;
                .three-d:not(.active):hover .three-d-box {
transform: translateZ(-25px) rotateX(90deg);
}
.front {
transform: rotatex(0deg) translatez(25px);
}
.back {
transform: rotatex(-90deg) translatez(25px);
}
以及很关键的transform-style: preserve-3d; perspective: 200px;
                    
                    2017-12-22
                
            transition: all 3s ease-in-out .8s;(所有属性height width,持续3秒,先加速再减速变化,延迟0.8秒再执行变化,对于零可以省略)。
                
                    
                    2017-12-17