A Pen by Bennett Feely.

index.html

<section>
  <nav>
    <a class="navicon-button loading">
      <div class="navicon"></div>
    </a>
    <a class="navicon-button larr">
      <div class="navicon"></div>
    </a>
    <a class="navicon-button uarr">
      <div class="navicon"></div>
    </a>    
    <a class="navicon-button x">
      <div class="navicon"></div>
    </a>
    <a class="navicon-button plus">
      <div class="navicon"></div>
    </a>
    <a class="navicon-button">
      <div class="navicon"></div>
    </a>
  </nav>
  <h1>Click the icons!</h1>
</section>

Navicon-Transformicons.markdown

Navicon Transformicons

A Pen by Bennett Feely on CodePen.

License.

script.js

$("a").click(function(){
  $(this).toggleClass("open");
  $("h1").addClass("fade");
});

style.scss

@import "compass";
/* Change this to watch in slo-mo */
$transition-duration: .5s;

$size : 100%;
$toggled-size : .75;

$bodybg : #449a88;
$navbg : #2a2a2a;
$pagebg : #e7e6dd;

.navicon-button {
  display: inline-block;
  position: relative;
  padding: 2.0625rem 1.5rem;
  transition: $transition-duration;
  cursor: pointer;
  user-select: none;
  opacity: .8;
  
  &:hover {
    opacity: 1;
    
    .navicon:before, .navicon:after {
      transition: $transition-duration/2;
    }
    
    .navicon:after { top: -.825rem; }
    .navicon:before { top: .825rem; }
  }
}

.navicon {
  position: relative;
  width: 2.5em;
  height: .3125rem;
  background: $pagebg;
  transition: $transition-duration;
  border-radius: 2.5rem;
  
  &:after, &:before {
    display: block;
    content: "";
    height: .3125rem;
    width: 2.5rem;
    background: $pagebg;
    position: absolute;
    z-index: -1;
    transition: $transition-duration ($transition-duration/2);
    border-radius: 1rem;
  }

  &:after { top: -.625rem; }
  &:before { top: .625rem; }
}

.open:not(.steps) .navicon:before,
.open:not(.steps) .navicon:after {
  top: 0 !important;
}

.open .navicon:before,
.open .navicon:after {
  transition: $transition-duration;
}

/* Minus */
.open { transform: scale($toggled-size); }

/* Arrows */
.open.larr .navicon,
.open.uarr .navicon {   
    &:before, &:after {
      width: 1.5rem;
    }
    
    &:before { transform: rotate(35deg); transform-origin: left top; }
    &:after { transform: rotate(-35deg); transform-origin: left bottom; }
}
.open.uarr { transform: scale($toggled-size) rotate(90deg); }

/* × and + */
.open.plus,
.open.x {
  .navicon {
    background: transparent;
    
    &:after { transform: rotate(45deg); }  
    &:before { transform: rotate(-45deg); }  
  }
}
.open.plus { transform: scale($toggled-size) rotate(45deg) }

.loading .navicon {
  color: dodgerblue;
  box-shadow: inset 0 0;
  transition: $transition-duration, box-shadow 0;
}

.loading .navicon { transition: 0; }

.open.loading {
  transform: none;

  .navicon {
    box-shadow: inset 2.5rem 0;
    transition: $transition-duration, box-shadow $transition-duration*5;

    
    &:before, &:after { opacity: 0; }
  }
}



/* Base ================== */
* { box-sizing: border-box; }

html { font-size: $size; }
html, body, section { position: relative; height: 100%; }

body {
  background: $bodybg;
  padding: 1.5rem 1.5rem 0;
  -webkit-backface-visibility: hidden;
}

section {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-radius: .5rem .5rem 0 0;  
  background: $pagebg;
  overflow: hidden;
  
  /* Smoother animations */
  & *,
  & *:before,
  & *:after {
   transform: translate3d(0,0,0); 
  }
}

nav {
  height: 4.5rem;
  background: $navbg;
  text-align: right;
  border-radius: .5rem .5rem 0 0;
  
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

h1 {
  text-align: right;
  font: 2rem/4.5rem "Kite One";
  padding: 0 1.5rem;
  opacity: .5;
  transition: $transition-duration*2;
  pointer-events: none;
  
  &.fade {
    opacity: 0;    
  }
}

@font-face {
  font-family: 'Kite One';
  font-style: normal;
  font-weight: 400;
  src: local('Kite One'), local('KiteOne-Regular'), url(http://themes.googleusercontent.com/static/fonts/kiteone/v1/VNHoD96LpZ9rGZTwjozAOnYhjbSpvc47ee6xR_80Hnw.woff) format('woff');
}