transform: matrix3d

Z-ROTATE : 30°, transform-origin: left top 0px

a {
    display: block;
     transform-origin: left top 0px;
    transition: all 0.2s ease 0s;
    -moz-transform-origin: left top 0px;
    -moz-transition: all 0.2s ease 0s;
    -webkit-transform-origin: left top 0px;
    -webkit-transition: all 0.2s ease 0s;
    -o-transform-origin: left top 0px;
    -o-transition: all 0.2s ease 0s;
    -ms-transform-origin: left top 0px;
    -ms-transition: all 0.2s ease 0s;
    
}
a:hover {
    transform: matrix3d(0.87,-0.5,0.00,0,0.50,0.87,0.00,0,0,0,1,0,0,0,0,1);
    -moz-transform: matrix3d(0.87,-0.5,0.00,0,0.50,0.87,0.00,0,0,0,1,0,0,0,0,1);
    -webkit-transform: matrix3d(0.87,-0.5,0.00,0,0.50,0.87,0.00,0,0,0,1,0,0,0,0,1);
    -o-transform: matrix3d(0.87,-0.5,0.00,0,0.50,0.87,0.00,0,0,0,1,0,0,0,0,1);
    -ms-transform: matrix3d(0.87,-0.5,0.00,0,0.50,0.87,0.00,0,0,0,1,0,0,0,0,1);
    
}

X-ROTATE : 90°, X-DEPTH : 0.008, transform-origin: center top 0px

• nav
• nav
• nav
• nav
• nav

li {
    display: inline-block;
    width: 90px;
    height: 90px;
    text-align: center;
}
a {
    display: table-cell;
    width: 90px;
    height: 90px;
    vertical-align: middle;
    background-color: #333;
    color: #FFF;
    transform-origin: center top 0px;
    transition: all 0.5s ease 0s;
    -moz-transform-origin: center top 0px;
    -moz-transition: all 0.5s ease 0s;
    -webkit-transform-origin: center top 0px;
    -webkit-transition: all 0.5s ease 0s;
    -o-transform-origin: center top 0px;
    -o-transition: all 0.5s ease 0s;
    -ms-transform-origin: center top 0px;
    -ms-transition: all 0.5s ease 0s;
}
li:hover a {
    transform:matrix3d(1,0,0.00,0,0.00,0,1.00,0.008,0,-1,0,0,0,0,0,1);
    -moz-transform:matrix3d(1,0,0.00,0,0.00,0,1.00,0.008,0,-1,0,0,0,0,0,1);
    -webkit-transform:matrix3d(1,0,0.00,0,0.00,0,1.00,0.008,0,-1,0,0,0,0,0,1);
    -o-transform:matrix3d(1,0,0.00,0,0.00,0,1.00,0.008,0,-1,0,0,0,0,0,1);
    -ms-transform:matrix3d(1,0,0.00,0,0.00,0,1.00,0.008,0,-1,0,0,0,0,0,1);
}