JSFiddle - React, Tailwind, and code Playground

HTML

<div><h1>Test</h1></div><a href="#" onlick="return false">toggle filter</a>

CSS

div {margin-top: 20px;}

div.opacity { -ms-filter: "progid:DXImageTransform.Microsoft.Blur(pixelRadius=3)"; }

h1 {margin-top:20px;}

JavaScript

$(document).ready( function() {
    $('a').click( function() {
        $('div').toggleClass('opacity');
    });
});