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HTML 

              
                doctype html
html.no-js(lang='en')
  head
    meta(charset='UTF-8')
    meta(http-equiv='X-UA-Compatible', content='IE=edge,chrome=1')
    meta(name='viewport', content='width=device-width, initial-scale=1.0')
    title Progress Button Styles
    meta(name='description', content='Progress Button Styles: Creative effects for loading buttons')
    meta(name='keywords', content='progress button, loading button, 3d, loading indicator, progress indicator')
    meta(name='author', content='Codrops')
    link(rel='shortcut icon', href='../favicon.ico')
  body
    .container
      .codrops-top.clearfix
      header
        h1
          | Progress Button Styles 
          span Creative effects for loading buttons
      .wrapper
        section
          h2 fill horizontal
          |  
          button.progress-button(data-style='fill', data-horizontal='') Submit
        section
          h2 fill vertical
          |  
          button.progress-button(data-style='fill', data-vertical='') Submit
        section
          h2 shrink horizontal
          |  
          button.progress-button(data-style='shrink', data-horizontal='') Submit
        section
          h2 shrink vertical
          |  
          button.progress-button(data-style='shrink', data-vertical='') Submit
      .wrapper
        section
          h2
            | rotate-angle-bottom
            br
            | perspective
          |  
          button.progress-button(data-style='rotate-angle-bottom', data-perspective='', data-horizontal='') Submit
        section
          h2
            | rotate-angle-top
            br
            | perspective
          |  
          button.progress-button(data-style='rotate-angle-top', data-perspective='', data-horizontal='') Submit
        section
          h2
            | rotate-angle-left
            br
            | perspective
          |  
          button.progress-button(data-style='rotate-angle-left', data-perspective='', data-vertical='') Submit
        section
          h2
            | rotate-angle-right
            br
            | perspective
          |  
          button.progress-button(data-style='rotate-angle-right', data-perspective='', data-vertical='') Submit
      .wrapper
        section
          h2
            | rotate-side-down
            br
            | perspective
          |  
          button.progress-button(data-style='rotate-side-down', data-perspective='', data-horizontal='') Submit
        section
          h2
            | rotate-side-up
            br
            | perspective
          |  
          button.progress-button(data-style='rotate-side-up', data-perspective='', data-horizontal='') Submit
        section
          h2
            | rotate-side-left
            br
            | perspective
          |  
          button.progress-button(data-style='rotate-side-left', data-perspective='', data-vertical='') Submit
        section
          h2
            | rotate-side-right
            br
            | perspective
          |  
          button.progress-button(data-style='rotate-side-right', data-perspective='', data-vertical='') Submit
      .wrapper
        section
          h2
            | rotate-back
            br
            | perspective
          |  
          button.progress-button(data-style='rotate-back', data-perspective='', data-horizontal='') Submit
        section
          h2
            | flip-open
            br
            | perspective
          |  
          button.progress-button(data-style='flip-open', data-perspective='', data-horizontal='') Submit
        section
          h2
            | slide-down
            br
            | horizontal
          |  
          button.progress-button(data-style='slide-down', data-horizontal='') Submit
        section
          h2
            | move-up
            br
            | horizontal
          |  
          button.progress-button(data-style='move-up', data-horizontal='') Submit
      .wrapper
        section
          h2
            | top-line
            br
            | horizontal
          |  
          button.progress-button(data-style='top-line', data-horizontal='') Submit
        section
          h2
            | lateral-lines
            br
            | vertical
          |  
          button.progress-button(data-style='lateral-lines', data-vertical='') Submit
        h1
          | Read more at 
          a omegakd.blogspot.com
!

CSS 

              
                *
  -webkit-box-sizing: border-box
  -moz-box-sizing: border-box
  box-sizing: border-box
  &:after, &::before
    -webkit-box-sizing: border-box
    -moz-box-sizing: border-box
    box-sizing: border-box

@font-face
  font-weight: normal
  font-style: normal
  font-family: 'icomoon'
  src: url('../fonts/icomoon/icomoon.eot')
  src: url('../fonts/icomoon/icomoon.eot?#iefix') format("embedded-opentype"), url('../fonts/icomoon/icomoon.ttf') format("truetype"), url('../fonts/icomoon/icomoon.woff') format("woff"), url('../fonts/icomoon/icomoon.svg#icomoon') format("svg")

@font-face
  font-family: 'FontAwesome'
  font-display: fallback
  src: url('https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/fonts/fontawesome-webfont.eot?v=4.7.0')
  src: url('https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/fonts/fontawesome-webfont.eot?#iefix&v=4.7.0') format("embedded-opentype"), url('https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0') format("woff2"), url('https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/fonts/fontawesome-webfont.woff?v=4.7.0') format("woff"), url('https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/fonts/fontawesome-webfont.ttf?v=4.7.0') format("truetype"), url('https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/fonts/fontawesome-webfont.svg?v=4.7.0#fontawesomeregular') format("svg")
  font-weight: normal
  font-style: normal

/* General styles for all types of buttons

.progress-button
  position: relative
  display: inline-block
  padding: 0 60px
  outline: none
  border: none
  background: #1d9650
  color: #fff
  text-transform: uppercase
  letter-spacing: 1px
  font-size: 1em
  line-height: 4
  &[disabled]
    cursor: default
    &.state-loading
      cursor: default
  .content
    position: relative
    display: block
    &::before, &::after
      position: absolute
      right: 20px
      color: #0e7138
      font-family: "FontAwesome"
      opacity: 0
      -webkit-transition: opacity 0.3s 0.3s
      transition: opacity 0.3s 0.3s
    &::before
      content: "\f00c"
      /* Checkmark for success
    &::after
      content: "\f071"
      /* Cross for error
  &.state-success .content::before, &.state-error .content::after
    opacity: 1

.notransition
  -webkit-transition: none !important
  transition: none !important

.progress-button
  .progress
    background: #148544
  .progress-inner
    position: absolute
    left: 0
    background: #0e7138
  &[data-horizontal] .progress-inner
    top: 0
    width: 0
    height: 100%
    -webkit-transition: width 0.3s, opacity 0.3s
    transition: width 0.3s, opacity 0.3s
  &[data-vertical] .progress-inner
    bottom: 0
    width: 100%
    height: 0
    -webkit-transition: height 0.3s, opacity 0.3s
    transition: height 0.3s, opacity 0.3s
  &[data-perspective]
    position: relative
    display: inline-block
    padding: 0
    background: transparent
    -webkit-perspective: 900px
    perspective: 900px
    .content
      padding: 0 60px
      background: #1d9650
    .progress-wrap
      display: block
      -webkit-transition: -webkit-transform 0.2s
      transition: transform 0.2s
      -webkit-transform-style: preserve-3d
      transform-style: preserve-3d
    .content, .progress
      outline: 1px solid rgba(0, 0, 0, 0)
      /* Smoothen jagged edges in FF
  &[data-style="fill"]
    &[data-horizontal]
      overflow: hidden
      .content
        z-index: 10
        -webkit-transition: -webkit-transform 0.3s
        transition: transform 0.3s
        &::before, &::after
          top: 100%
          right: auto
          left: 50%
          -webkit-transition: opacity 0.3s
          transition: opacity 0.3s
          -webkit-transform: translateX(-50%)
          transform: translateX(-50%)
      &.state-success .content, &.state-error .content
        -webkit-transform: translateY(-100%)
        transform: translateY(-100%)
    &[data-vertical]
      overflow: hidden
      .content
        z-index: 10
        -webkit-transition: -webkit-transform 0.3s
        transition: transform 0.3s
        &::before, &::after
          top: 100%
          right: auto
          left: 50%
          -webkit-transition: opacity 0.3s
          transition: opacity 0.3s
          -webkit-transform: translateX(-50%)
          transform: translateX(-50%)
      &.state-success .content, &.state-error .content
        -webkit-transform: translateY(-100%)
        transform: translateY(-100%)
  &[data-style="shrink"]
    /* common for horizontal and vertical
    overflow: hidden
    -webkit-transition: -webkit-transform 0.2s
    transition: transform 0.2s
    &[data-horizontal]
      .content
        -webkit-transition: opacity 0.3s, -webkit-transform 0.3s
        transition: opacity 0.3s, transform 0.3s
        &::before, &::after
          top: 100%
          right: auto
          left: 50%
          -webkit-transition: opacity 0.3s
          transition: opacity 0.3s
          -webkit-transform: translateX(-50%)
          transform: translateX(-50%)
      &.state-loading
        -webkit-transform: scaleY(0.3)
        transform: scaleY(0.3)
        .content
          opacity: 0
      &.state-success .content, &.state-error .content
        -webkit-transform: translateY(-100%)
        transform: translateY(-100%)
    &[data-vertical]
      .content
        -webkit-transition: opacity 0.3s, -webkit-transform 0.3s
        transition: opacity 0.3s, transform 0.3s
        &::before, &::after
          top: 100%
          right: auto
          left: 50%
          -webkit-transition: opacity 0.3s
          transition: opacity 0.3s
          -webkit-transform: translateX(-50%)
          transform: translateX(-50%)
      &.state-loading
        -webkit-transform: scaleX(0.1)
        transform: scaleX(0.1)
        .content
          opacity: 0
      &.state-success .content, &.state-error .content
        -webkit-transform: translateY(-100%)
        transform: translateY(-100%)
  &[data-style="rotate-angle-bottom"]
    .progress
      position: absolute
      top: 100%
      left: 0
      width: 100%
      height: 20px
      box-shadow: 0 -1px 0 #148544
      /* fix the blurriness that causes a gap
      -webkit-transform: rotateX(-90deg)
      transform: rotateX(-90deg)
      -webkit-transform-origin: 50% 0%
      transform-origin: 50% 0%
    &.state-loading .progress-wrap
      -webkit-transform: rotateX(45deg)
      transform: rotateX(45deg)
  &[data-style="rotate-angle-top"]
    .progress
      position: absolute
      bottom: 100%
      left: 0
      width: 100%
      height: 20px
      box-shadow: 0 1px 0 #148544
      /* fix the blurriness that causes a gap
      -webkit-transform: rotateX(90deg)
      transform: rotateX(90deg)
      -webkit-transform-origin: 50% 100%
      transform-origin: 50% 100%
    &.state-loading .progress-wrap
      -webkit-transform: rotateX(-45deg)
      transform: rotateX(-45deg)
  &[data-style="rotate-angle-left"]
    .progress
      position: absolute
      top: 0
      right: 100%
      width: 20px
      height: 100%
      box-shadow: 1px 0 0 #148544
      /* fix the blurriness that causes a gap
      -webkit-transform: rotateY(-90deg)
      transform: rotateY(-90deg)
      -webkit-transform-origin: 100% 50%
      transform-origin: 100% 50%
    &.state-loading .progress-wrap
      -webkit-transform: rotateY(45deg)
      transform: rotateY(45deg)
  &[data-style="rotate-angle-right"]
    .progress
      position: absolute
      top: 0
      left: 100%
      width: 20px
      height: 100%
      box-shadow: -1px 0 0 #148544
      /* fix the blurriness that causes a gap
      -webkit-transform: rotateY(90deg)
      transform: rotateY(90deg)
      -webkit-transform-origin: 0% 50%
      transform-origin: 0% 50%
    &.state-loading .progress-wrap
      -webkit-transform: rotateY(-45deg)
      transform: rotateY(-45deg)
  &[data-style="rotate-side-down"]
    .progress
      position: absolute
      top: 100%
      left: 0
      width: 100%
      height: 20px
      -webkit-transform: rotateX(-90deg)
      transform: rotateX(-90deg)
      -webkit-transform-origin: 50% 0%
      transform-origin: 50% 0%
      -webkit-backface-visibility: hidden
      backface-visibility: hidden
    &.state-loading .progress-wrap
      -webkit-transform: rotateX(90deg) translateZ(10px)
      transform: rotateX(90deg) translateZ(10px)
  &[data-style="rotate-side-up"]
    .progress
      position: absolute
      bottom: 100%
      left: 0
      width: 100%
      height: 20px
      -webkit-transform: rotateX(90deg)
      transform: rotateX(90deg)
      -webkit-transform-origin: 50% 100%
      transform-origin: 50% 100%
      -webkit-backface-visibility: hidden
      backface-visibility: hidden
    &.state-loading .progress-wrap
      -webkit-transform: rotateX(-90deg) translateZ(10px)
      transform: rotateX(-90deg) translateZ(10px)
  &[data-style="rotate-side-left"]
    .progress-wrap
      -webkit-transform-origin: 0 50%
      transform-origin: 0 50%
    .progress
      position: absolute
      top: 0
      left: 0
      width: 20px
      height: 100%
      -webkit-transform: rotateY(90deg)
      transform: rotateY(90deg)
      -webkit-transform-origin: 0 50%
      transform-origin: 0 50%
    &.state-loading .progress-wrap
      -webkit-transform: translateX(50%) rotateY(90deg) translateZ(10px)
      transform: translateX(50%) rotateY(90deg) translateZ(10px)
  &[data-style="rotate-side-right"]
    .progress-wrap
      -webkit-transform-origin: 100% 50%
      transform-origin: 100% 50%
    .progress
      position: absolute
      top: 0
      left: 100%
      width: 20px
      height: 100%
      -webkit-transform: rotateY(90deg)
      transform: rotateY(90deg)
      -webkit-transform-origin: 0 50%
      transform-origin: 0 50%
    &.state-loading .progress-wrap
      -webkit-transform: translateX(-50%) rotateY(-90deg) translateZ(10px)
      transform: translateX(-50%) rotateY(-90deg) translateZ(10px)
  &[data-style="rotate-back"]
    .progress-wrap
      -webkit-transition-timing-function: ease-out
      transition-timing-function: ease-out
    .content
      -webkit-backface-visibility: hidden
      backface-visibility: hidden
    .progress
      position: absolute
      top: 100%
      left: 0
      width: 100%
      height: 100%
      -webkit-transform: rotateX(-180deg)
      transform: rotateX(-180deg)
      -webkit-transform-origin: 50% 0%
      transform-origin: 50% 0%
      -webkit-backface-visibility: hidden
      backface-visibility: hidden
    &.state-loading .progress-wrap
      -webkit-transform: rotateX(180deg) scaleX(0.6) scaleY(0.3)
      transform: rotateX(180deg) scaleX(0.6) scaleY(0.3)
  &[data-style="flip-open"]
    .content
      z-index: 10
      -webkit-transition: -webkit-transform 0.2s
      transition: transform 0.2s
      -webkit-transform-origin: 50% 0
      transform-origin: 50% 0
    .progress
      position: absolute
      top: 0
      left: 0
      width: 100%
      height: 100%
    &.state-loading .content
      -webkit-transform: rotateX(45deg)
      transform: rotateX(45deg)
  &[data-style="slide-down"]
    padding: 0
    overflow: visible
    -webkit-backface-visibility: hidden
    backface-visibility: hidden
    .content
      z-index: 10
      padding: 0 60px
      background: #1d9650
    .progress
      position: absolute
      top: 0
      left: 0
      width: 100%
      height: 100%
      -webkit-transition: -webkit-transform 0.2s
      transition: transform 0.2s
    &.state-loading .progress
      -webkit-transform: translateY(10px)
      transform: translateY(10px)
  &[data-style="move-up"]
    padding: 0
    overflow: visible
    -webkit-backface-visibility: hidden
    backface-visibility: hidden
    .content
      z-index: 10
      padding: 0 60px
      background: #1d9650
      -webkit-transition: -webkit-transform 0.2s
      transition: transform 0.2s
    .progress
      position: absolute
      top: 0
      left: 0
      width: 100%
      height: 100%
    &.state-loading .content
      -webkit-transform: translateY(-10px)
      transform: translateY(-10px)
  &[data-style="top-line"]
    .progress-inner
      height: 3px
    .content
      &::before, &::after
        right: auto
        left: 100%
        margin-left: 25px
  &[data-style="lateral-lines"]
    .progress-inner
      width: 100%
      border-right: 3px solid #0e7138
      border-left: 3px solid #0e7138
      background: transparent
    .content
      &::before, &::after
        right: auto
        left: 100%
        margin-left: 25px

/* Necessary 3d styles for buttons with perspective

/* Individual styles
/* Choose the effect(s) you want, delete the rest

/* Fill horizontal
/* ======================

/* Fill vertical
/* ======================

/* Shrink horizontal
/* ======================

/* Shrink vertical
/* ======================

/* Rotate bottom 3d
/* ======================

/* Rotate top 3d
/* ======================

/* Rotate left 3d
/* ======================

/* Rotate right 3d
/* ======================

/* Rotate side down 3d
/* ======================

/* Rotate side up 3d
/* ======================

/* Rotate side left 3d
/* ======================

/* Rotate side right 3d
/* ======================

/* Rotate back 3d
/* ======================

/* flip open 3d
/* ======================

/* slide down
/* ======================

/* move-up
/* ======================

/* top-line
/* ======================

/* lateral-lines
/* ======================

/*************************************/

@import url(https://fonts.googleapis.com/css?family=Lato:300,400,700)

@font-face
  font-family: 'codropsicons'
  src: url('../fonts/codropsicons/codropsicons.eot')
  src: url('../fonts/codropsicons/codropsicons.eot?#iefix') format("embedded-opentype"), url('../fonts/codropsicons/codropsicons.woff') format("woff"), url('../fonts/codropsicons/codropsicons.ttf') format("truetype"), url('../fonts/codropsicons/codropsicons.svg#codropsicons') format("svg")
  font-weight: normal
  font-style: normal


body
  background: #27ae60
  color: #fff
  font-family: 'Lato', Arial, sans-serif

.clearfix
  &:before
    content: ''
    display: table
  &:after
    content: ''
    display: table
    clear: both

a
  color: #148544
  text-decoration: none
  outline: none
  &:hover, &:focus
    color: #fff

.container > header
  margin: 0 auto 2em
  padding: 2em
  text-align: center
  background: rgba(0, 0, 0, 0.01)
  h1
    font-size: 3.5em
    line-height: 1.3
    margin: 0
    font-weight: 300
  span
    display: block
    font-size: 60%
    color: #148544
    padding: 0.3em 0 0.6em 0.1em

.note
  color: #85cd62

/* To Navigation Style

.codrops-top
  text-transform: uppercase
  width: 100%
  font-size: 0.69em
  line-height: 2.2
  font-weight: 700
  a
    text-decoration: none
    padding: 0 1em
    letter-spacing: 0.1em
    display: inline-block
  span.right
    float: right
    a
      float: left
      display: block

.codrops-icon:before
  font-family: 'codropsicons'
  margin: 0 4px
  speak: none
  font-style: normal
  font-weight: normal
  font-variant: normal
  text-transform: none
  line-height: 1
  -webkit-font-smoothing: antialiased

.codrops-icon-drop:before
  content: "\e001"

.codrops-icon-prev:before
  content: "\e004"

.wrapper
  text-align: center
  vertical-align: top

section
  position: relative
  text-align: center
  padding: 1em 1em 3em

.wrapper section
  display: inline-block
  width: 300px

section h2
  text-transform: uppercase
  letter-spacing: 1px
  color: #148544
  font-weight: 700
  padding: 1em
  font-size: 0.8em
  -webkit-backface-visibility: hidden

.related
  font-size: 2em
  font-weight: 300

@media screen and (max-width: 25em)
  .container > header
    font-size: 70%
  .related
    font-size: 120%
  .codrops-icon span
    display: none
!

JS 

              
                /*!
 * classie - class helper functions
 * from bonzo https://github.com/ded/bonzo
 * 
 * classie.has( elem, 'my-class' ) -> true/false
 * classie.add( elem, 'my-new-class' )
 * classie.remove( elem, 'my-unwanted-class' )
 * classie.toggle( elem, 'my-class' )
 */

/*jshint browser: true, strict: true, undef: true */
/*global define: false */

( function( window ) {

'use strict';

// class helper functions from bonzo https://github.com/ded/bonzo

function classReg( className ) {
  return new RegExp("(^|\\s+)" + className + "(\\s+|$)");
}

// classList support for class management
// altho to be fair, the api sucks because it won't accept multiple classes at once
var hasClass, addClass, removeClass;

if ( 'classList' in document.documentElement ) {
  hasClass = function( elem, c ) {
    return elem.classList.contains( c );
  };
  addClass = function( elem, c ) {
    elem.classList.add( c );
  };
  removeClass = function( elem, c ) {
    elem.classList.remove( c );
  };
}
else {
  hasClass = function( elem, c ) {
    return classReg( c ).test( elem.className );
  };
  addClass = function( elem, c ) {
    if ( !hasClass( elem, c ) ) {
      elem.className = elem.className + ' ' + c;
    }
  };
  removeClass = function( elem, c ) {
    elem.className = elem.className.replace( classReg( c ), ' ' );
  };
}

function toggleClass( elem, c ) {
  var fn = hasClass( elem, c ) ? removeClass : addClass;
  fn( elem, c );
}

var classie = {
  // full names
  hasClass: hasClass,
  addClass: addClass,
  removeClass: removeClass,
  toggleClass: toggleClass,
  // short names
  has: hasClass,
  add: addClass,
  remove: removeClass,
  toggle: toggleClass
};

// transport
if ( typeof define === 'function' && define.amd ) {
  // AMD
  define( classie );
} else {
  // browser global
  window.classie = classie;
}

})( window );


/****************************************/

/* script */
/**
 * progressButton.js v1.0.0
 * http://www.codrops.com
 *
 * Licensed under the MIT license.
 * https://www.opensource.org/licenses/mit-license.php
 * 
 * Copyright 2013, Codrops
 * http://www.codrops.com
 */
;( function( window ) {
	
	'use strict';

	// https://gist.github.com/edankwan/4389601
	Modernizr.addTest('csstransformspreserve3d', function () {
		var prop = Modernizr.prefixed('transformStyle');
		var val = 'preserve-3d';
		var computedStyle;
		if(!prop) return false;

		prop = prop.replace(/([A-Z])/g, function(str,m1){ return '-' + m1.toLowerCase(); }).replace(/^ms-/,'-ms-');

		Modernizr.testStyles('#modernizr{' + prop + ':' + val + ';}', function (el, rule) {
			computedStyle = window.getComputedStyle ? getComputedStyle(el, null).getPropertyValue(prop) : '';
		});

		return (computedStyle === val);
	});

	function extend( a, b ) {
		for( var key in b ) { 
			if( b.hasOwnProperty( key ) ) {
				a[key] = b[key];
			}
		}
		return a;
	}

	// support
	var support = { transitions : Modernizr.csstransitions, transforms3d : Modernizr.csstransforms3d && Modernizr.csstransformspreserve3d },
		// transition end event name
		transEndEventNames = {
			'WebkitTransition': 'webkitTransitionEnd',
			'MozTransition': 'transitionend',
			'OTransition': 'oTransitionEnd',
			'msTransition': 'MSTransitionEnd',
			'transition': 'transitionend'
		},
		transEndEventName = transEndEventNames[ Modernizr.prefixed( 'transition' ) ];

	function ProgressButton( el, options ) {
		this.button = el;
		this.options = extend( {}, this.options );
  		extend( this.options, options );
  		this._init();
	}

	ProgressButton.prototype.options = {
		// time in ms that the status (success or error will be displayed)
		// during this time the button will be disabled
		statusTime : 1500
	};

	ProgressButton.prototype._init = function() {
		this._validate();
		// create structure
		this._create();
		// init events
		this._initEvents();
	};

	ProgressButton.prototype._validate = function() {
		// we will consider the fill/horizontal as default
		if( this.button.getAttribute( 'data-style' ) === null ) {
			this.button.setAttribute( 'data-style', 'fill' );
		}
		if( this.button.getAttribute( 'data-vertical' ) === null && this.button.getAttribute( 'data-horizontal' ) === null ) {
			this.button.setAttribute( 'data-horizontal', '' );
		}
		if( !support.transforms3d && this.button.getAttribute( 'data-perspective' ) !== null ) {
			this.button.removeAttribute( 'data-perspective' );
			this.button.setAttribute( 'data-style', 'fill' );
			this.button.removeAttribute( 'data-vertical' );
			this.button.setAttribute( 'data-horizontal', '' );
		}
	};

	ProgressButton.prototype._create = function() {
		var textEl = document.createElement( 'span' );
		textEl.className = 'content';
		textEl.innerHTML = this.button.innerHTML;
		var progressEl = document.createElement( 'span' );
		progressEl.className = 'progress';

		var progressInnerEl = document.createElement( 'span' );
		progressInnerEl.className = 'progress-inner';
		progressEl.appendChild( progressInnerEl );
		// clear content
		this.button.innerHTML = '';

		if( this.button.getAttribute( 'data-perspective' ) !== null ) {
			var progressWrapEl = document.createElement( 'span' );
			progressWrapEl.className = 'progress-wrap';
			progressWrapEl.appendChild( textEl );
			progressWrapEl.appendChild( progressEl );
			this.button.appendChild( progressWrapEl );
		}
		else {
			this.button.appendChild( textEl );
			this.button.appendChild( progressEl );
		}
		
		// the element that serves as the progress bar
		this.progress = progressInnerEl;

		// property to change on the progress element
		if( this.button.getAttribute( 'data-horizontal' ) !== null ) {
			this.progressProp = 'width';
		}
		else if( this.button.getAttribute( 'data-vertical' ) !== null ) {
			this.progressProp = 'height';
		}
		this._enable();
	};

	ProgressButton.prototype._setProgress = function( val ) {
		this.progress.style[ this.progressProp ] = 100 * val + '%';
	};

	ProgressButton.prototype._initEvents = function() {
		var self = this;
		this.button.addEventListener( 'click', function() {
			// disable the button
			self.button.setAttribute( 'disabled', '' );
			// add class state-loading to the button (applies a specific transform to the button depending which data-style is defined - defined in the stylesheets)
			classie.remove( self.progress, 'notransition' );
			classie.add( this, 'state-loading' );

			setTimeout( function() {
				if( typeof self.options.callback === 'function' ) {
					self.options.callback( self );
				}
				else {
					self._setProgress( 1 );
					var onEndTransFn = function( ev ) {
						if( support.transitions && ev.propertyName !== self.progressProp ) return;
						this.removeEventListener( transEndEventName, onEndTransFn );
						self._stop();
					};
					
					if( support.transitions ) {
						self.progress.addEventListener( transEndEventName, onEndTransFn );
					}
					else {
						onEndTransFn.call();
					}
					
				}
			}, 
			self.button.getAttribute( 'data-style' ) === 'fill' || 
			self.button.getAttribute( 'data-style' ) === 'top-line' ||
			self.button.getAttribute( 'data-style' ) === 'lateral-lines' ? 0 : 200 ); // TODO: change timeout to transitionend event callback
		} );
	};

	ProgressButton.prototype._stop = function( status ) {
		var self = this;

		setTimeout( function() {
			// fade out progress bar
			self.progress.style.opacity = 0;
			var onEndTransFn = function( ev ) {
				if( support.transitions && ev.propertyName !== 'opacity' ) return;
				this.removeEventListener( transEndEventName, onEndTransFn );
				classie.add( self.progress, 'notransition' );
				self.progress.style[ self.progressProp ] = '0%';
				self.progress.style.opacity = 1;
			};

			if( support.transitions ) {
				self.progress.addEventListener( transEndEventName, onEndTransFn );
			}
			else {
				onEndTransFn.call();
			}
			
			
			// add class state-success to the button
			if( typeof status === 'number' ) {
				var statusClass = status >= 0 ? 'state-success' : 'state-error';
				classie.add( self.button, statusClass );
				// after options.statusTime remove status
				setTimeout( function() {
					classie.remove( self.button, statusClass );
					self._enable();
				}, self.options.statusTime );
			}
			else {
				self._enable();
			}

			// remove class state-loading from the button
			classie.remove( self.button, 'state-loading' );
		}, 100 );
	};

	// enable button
	ProgressButton.prototype._enable = function() {
		this.button.removeAttribute( 'disabled' );
	}

	// add to global namespace
	window.ProgressButton = ProgressButton;

})( window );

/****************************************/
/*script initioalization */

[].slice.call( document.querySelectorAll( 'button.progress-button' ) ).forEach( function( bttn ) {
				new ProgressButton( bttn, {
					callback : function( instance ) {
						var progress = 0,
							interval = setInterval( function() {
								progress = Math.min( progress + Math.random() * 0.1, 1 );
								instance._setProgress( progress );

								if( progress === 1 ) {
									instance._stop(1);
									clearInterval( interval );
								}
							}, 200 );
					}
				} );
			} );
!
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