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							<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Resize Detector</title>
<style>
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 12px;
  color: #999;
}

#container {
  width: 600px;
}

#pusher {
  float: left;
  width: 100px;
  height: 100px;
  line-height: 100px;
  text-align: center;
  background: #eee;
  cursor: pointer;
  transition: width 2s, background-color .3s;
}

#pusher:hover {
  width: 300px;
}

:checked + #pusher {
  width: 400px;
  background: #eec;
}

#el {
  position: relative;
  overflow: hidden;
  height: 100px;
  background: #9ca;
  line-height: 100px;
  text-align: center;
  color: #fff;
  font-weight: 700;
}

#wrapper {
  width: 300px;
  height: 200px;
  transition: width .5s;
}

#wrapper.expanded {
  width: 450px;
}

#r1,
#r2 {
  width: 100%;
  height: 100px;
}

#r1 {
  background: #acc;
}
#r2 {
  background: #cca;
}

#output {
  white-space: pre-wrap;
}

.log {
  display: inline-block;
  padding: 2px 5px;
  margin: 0 1px 1px 0;
  background-color: #cce;
}
</style>
</head>
<body>
<p><label id="attach"><input type="checkbox" checked> Attached</button></label></p>
<p><label id="display"><input type="checkbox"><code>display: none</code></label></p>
<div id="container">
  <input id="push" type="checkbox" style="display: none">
  <label id="pusher" for="push">Hover or Click</label>
  <div id="el">&rarr; Resize Detector Enabled &larr;</div>
</div>
<section id="wrapper">
  <div id="r1"></div>
  <div id="r2"></div>
</section>
<pre id="output"></pre>
<script src="../dist/index.js"></script>
<script>
var el = document.getElementById('el')
var container = document.getElementById('container')
var attach = document.getElementById('attach')
var wrapper = document.getElementById('wrapper')
var r1 = document.getElementById('r1')
var r2 = document.getElementById('r2')
var display = document.getElementById('display')
var output = document.getElementById('output')

function log (msg) {
  output.innerHTML += `<span class="log">${msg}</span>`
}

resizeDetector.addListener(el, function () {
  log(el.offsetWidth + '×' + el.offsetHeight)
})

attach.addEventListener('change', function () {
  var input = attach.firstElementChild
  if (input.checked) {
    container.appendChild(el)
  } else {
    container.removeChild(el)
  }
})

display.addEventListener('change', function () {
  var input = display.firstElementChild
  if (input.checked) {
    el.style.display = 'none'
  } else {
    el.style.display = ''
  }
})

wrapper.addEventListener('click', function () {
  wrapper.classList.toggle('expanded')
})

resizeDetector.addListener(r1, function () {
  log('r1: resize')
})

resizeDetector.addListener(r2, function () {
  log('r2: resize')
})
</script>
</body>
</html>