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HTML

            
              <span id="ball"></span>
<section>
  <span id="moveMe">Animation</span>
</section>
<section>
  <div class="transition">Transition</div>
</section>
<section>
  <div class="user-img"></div>
</section>

<!-- 
Common transforms:
transform: scale(2, 0.5);
transform: scaleX(2);
transform: scaleY(0.5);
transform: rotate(0.5turn);
transform: translateZ(2px);
transform: scale3d(2.5, 1.2, 0.3);
transform: scaleZ(0.3);
transform: rotate3d(1, 2.0, 3.0, 10deg);
transform: rotateX(10deg);
transform: rotateY(10deg);
transform: rotateZ(10deg);
transform: perspective(17px);
-->
!

CSS

            
              * {box-sizing: border-box;}
body { 
  font-family: arial;
  background: #444;
  color: #ccc;
}
section {
  width: 200px;
  display: block;
  position: absolute;
}
.transition {
  border: 5px solid #333;
  text-align: center;
  height: 5em;
  width: 6em;
  line-height: 4.5em;
  background: #666;
  opacity: .5;
  margin: 1em 1em 0 15em;
  // No commas between transforms
  transform: scale(1.2) ; // Transform simply applied
  transform-origin: center center; 
  transition:
    line-height .5s,
    color .5s, 
    width .5s, 
    height .5s, 
    background .5s, 
    transform .5s, // Looks at transform property and applies over time
    opacity .5s, 
    ease;
  &:hover {
    color: #444;
    opacity: .5;
    background: #ccc;
    width: 8em;
    height: 8em;
    line-height: 7em;
    // Something I want the element to do when hovered.
    // Without the transition property specifying it over time,
    // it would just be applied immediately
    transform: rotate(-5deg);
  }
}
// Transform triggered with a JS onclick event
#ball{
  border: 5px solid #333;
  border-radius: 50px;
  width: 50px;
  height: 50px;
  background: #666;
  position: absolute;
  top: 0;
  left: 0;
  transition: transform 1s; 
}

// CSS Animations: create your animation
// use transforms for positioning, it creates a new
// stacking context and allows the browser to use the GPU
@keyframes play {
   0%   { transform: translate(50px, 0); opacity: 0; }
   25%  { transform: translate(100px, 0); }
   50%  { transform: translate(100px, 50px); opacity: 1;}
   75%  { transform: translate(100px, 0); }
   100% { transform: translate(50px, 0); opacity: 0;}
}
#moveMe {
  // call your animation by name
  animation: play 2s infinite;
  border: 5px solid #333;
  background: #666;
  padding: 1em;
  position: absolute;
}

//-----------------------------------------
// Animating clip-path
.user-img {
  transition: clip-path .5s ease, opacity .5s ease;
  clip-path: circle(10%);
  background-image: url(https://upload.wikimedia.org/wikipedia/commons/7/79/SNG.gif);
  background-postition:  left -30px top -50px;
  background-size: 100%;
  background-repeat: no-repeat;
  height: 200px;
  width: 200px;
  margin-left: 23em;
  opacity: .2;
  &:hover {
    clip-path: circle(50%);
    opacity: 1;
  }
}
!

JS

            
              var b = document.getElementById('ball');
document.addEventListener('click', function(ev){
    b.style.transform = 'translateY('+(ev.clientY-25)+'px)';
    b.style.transform += 'translateX('+(ev.clientX-25)+'px)';
},false);
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999px
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