this code is javascript hover opacity library for browser(contain ie8).
npm install --save-dev opaciteen
var opaciteen = require('opaciteen');
var opaciteen01 = opaciteen();
var opaciteen02 = opaciteen({
root: "js-opaciteenpattern02",
duration: 500 // msec
});
<script src="jquery.js"></script>
<script src="opaciteen.js"></script>
<script src="app.js"></script> // module load
# app.js
var opaciteen01 = opaciteen();