<!DOCTYPE html>
<html>
<head>
</head>
<body>
  <div>0.5s</div>
  <div>2s, 1s</div>
  <div>5s, 2.5s</div>
</body>
</html>
div {
  width: 100px;
  height: 50px;
  padding: 10px;
  color: black;
  background-color: skyblue;
  margin-bottom: 10px;
  transition-property: width, opacity;
}
div:nth-child(1) {
  transition-duration: 0.5s;
}
div:nth-child(2) {
  transition-duration: 2s, 1s;
}
div:nth-child(3) {
  transition-duration: 5s, 2.5s;
}
div:hover {
  width: 300px;
  opacity: 0.6;
}

External CSS

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External JavaScript

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