JSFiddle - React, Tailwind, and code Playground

HTML

<div id="before"></div>
    <div id="after"></div>

CSS

#after        {
            display: none;
            filter: alpha(Opacity=85);
            filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=85);
        }

JavaScript

$('#before').html('Before fadeIn the filter css property on #after is: ' + $('#after').css('filter'));
$('#after').fadeIn('fast', function() {
    $('#after').html('After fadeIn the filter css property on #after is: ' + $('#after').css('filter'));
});