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HTML

CSS

CSS Base

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JavaScript

Babel includes JSX processing.

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HTML

              
                <div class="settings">
  <div class="help">Play with the values below</div>
  easeParams:[
    <input id="overshoot" value="1">
  ,
    <input id="period" value="0.3">
  ]
  <div class="help help-bottom">(overshoot) (period)</div>
</div>
<div class="el"></div>
              
            
!

CSS

              
                body
  background #1a1c1d
  color #888
  font-family monospace
  font-size 30px
  
.settings
  position absolute
  width 500px
  margin-left -250px
  left 50%
  top 50%
  margin-top -150px

.help
  font-size 0.5em
  &.help-bottom
    margin-left 15.5em
  
.el
  background #37f
  width 130px
  height 130px
  border-radius 100%
  position absolute
  top 50%
  left 50%
  margin-left -65px
  margin-top -65px
  
input
  background transparent
  border none
  color #fff
  width 2.5em
  border-bottom 1px dotted #555
  text-align center
  padding 0
  margin 0
              
            
!

JS

              
                var el=document.querySelector('.el');
var overshoot=1;
var period=0.3;
(function bounce(){
  TweenMax.to(el,0.5,{
    scale:0.3,
    onComplete:function(){
      TweenMax.to(el,1.4,{
        scale:1,
        ease:Elastic.easeOut,
        easeParams:[overshoot,period],
        onComplete:bounce
      })
    }
  })
}());

setInterval(function(){
  overshoot=document.querySelector('#overshoot').value;
period=document.querySelector('#period').value;
},500)

              
            
!
999px

Console