<div id="wrap-animate">
  <div class="animate-box" id="blur-box">
    <h3>Blur Transition</h3>
    <a id='trigger'>GO!</a>
    <div class="box"></div>
  </div>
</div>

@import url(https://fonts.googleapis.com/css?family=Oswald:400,300);

* {
  box-sizing: border-box;
}
body {
  background-color: #e6e6e6;
  font-family: "Oswald", sans-serif;
}

#wrap-animate {
  display: border-box;
  width: 600px;
  margin: 0px auto;
}

.animate-box {
  position: relative;
  width: 100%;
  margin-bottom: 80px;
}
.animate-box h3 {
  margin-bottom: 20px;
  font-size: 1.6em;
}
.animate-box h3 small {
  font-weight: 300;
  font-style: italic;
}
.animate-box a {
  margin-bottom: 20px;
  background: #55f;
  color: #fff;
  border-radius: 5px;
  padding: 8px;
  font-weight: 300;
  display: inline-block;
  cursor: pointer;
}
.box {
  background-color: #f08;
  width: 50px;
  height: 50px;
  position: absolute;
  border-radius: 10px;
}
.box.animateIn {
  animation: ninja ease-in-out 0.2s;
  animation-fill-mode: forwards;
}

.box.animateOut {
  animation: ninjaOut ease-in-out 0.2s;
  animation-fill-mode: forwards;
}

@keyframes ninja {
  0% {
    left: 0;
    transform: scale(1) translate3d(0, 0, 0);
  }
  50% {
    filter: blur(3px);
  }
  100% {
    filter: blur(0);
    left: 100%;
    transform: scale(1) translate3d(0, 0, 0);
  }
}

@keyframes ninjaOut {
  0% {
    filter: blur(0);
    left: 100%;
    transform: scale(1) translate3d(0, 0, 0);
  }
  50% {
    filter: blur(3px);
  }
  100% {
    left: 0;
    transform: scale(1) translate3d(0, 0, 0);
  }
}

const trigger = document.querySelector("#trigger");
const box = document.querySelector(".box");

trigger.addEventListener("click", (e) => {
  const classArray = Object.keys(box.classList).map((x) => box.classList[x]);
  if (classArray.includes("animateIn")) {
    box.classList.remove("animateIn");
    box.classList.add("animateOut");
  } else {
    box.classList.add("animateIn");
    box.classList.remove("animateOut");
  }
});