JSFiddle - React, Tailwind, and code Playground

HTML

<div id="fo"></div>

CSS

#fo {
    height: 10px;
    background: #f00;
}

#fo.tra {
    height: 50px;
}

JavaScript

function animateClass(el, klass) {
    var endCSS = el.toggleClass(klass).css();
    var startCSS = el.toggleClass(klass).css();
    for ( var p in endCSS ) {
        if ( startCSS[p] === endCSS[p] ) {
            delete endCSS[p];
        }
    }
    console.log(endCSS);
    el.animate(endCSS, 'slow', function() {
        el.toggleClass(klass).removeAttr('style');
    });
};

$('#fo').on('click', function() {
    animateClass($(this), 'tra');
});



jQuery.fn.css = (function(css2) { 
    return function() {
        if (arguments.length) { return css2.apply(this, arguments); }
        var attr = ['font-family','font-size','font-weight','font-style','color',
            'text-transform','text-decoration','letter-spacing','word-spacing',
            'line-height','text-align','vertical-align','direction','background-color',
            'background-image','background-repeat','background-position',
            'background-attachment','opacity','width','height','top','right','bottom',
            'left','margin-top','margin-right','margin-bottom','margin-left',
            'padding-top','padding-right','padding-bottom','padding-left',
            'border-top-width','border-right-width','border-bottom-width',
            'border-left-width','border-top-color','border-right-color',
            'border-bottom-color','border-left-color','border-top-style',
            'border-right-style','border-bottom-style','border-left-style','position',
            'display','visibility','z-index','overflow-x','overflow-y','white-space',
            'clip','float','clear','cursor','list-style-image','list-style-position',
            'list-style-type','marker-offset'];
        var len = attr.length, obj = {};
        for (var i = 0; i < len; i++) {
            obj[attr[i]] = css2.call(this, attr[i]);
        }
        return obj;
    };
})(jQuery.fn.css);