JSFiddle - React, Tailwind, and code Playground

by Neal

HTML

<div>This is a test</div>

CSS

.highlight { 
    color: red; 
}

JavaScript

var classAnimationActions = [ "add", "remove", "toggle" ],
	shorthandStyles = {
		border: 1,
		borderBottom: 1,
		borderColor: 1,
		borderLeft: 1,
		borderRight: 1,
		borderTop: 1,
		borderWidth: 1,
		margin: 1,
		padding: 1
	};
function styleDifference( oldStyle, newStyle ) {
	var diff = {},
		name, value;

	for ( name in newStyle ) {
		value = newStyle[ name ];
		if ( oldStyle[ name ] !== value ) {
			if ( !shorthandStyles[ name ] ) {
				if ( $.fx.step[ name ] || !isNaN( parseFloat( value ) ) ) {
					diff[ name ] = value;
				}
			}
		}
	}

	return diff;
}
function getElementStyles( elem ) {
	var key, len,
		style = elem.ownerDocument.defaultView ?
			elem.ownerDocument.defaultView.getComputedStyle( elem, null ) :
			elem.currentStyle,
		styles = {};

	if ( style && style.length && style[ 0 ] && style[ style[ 0 ] ] ) {
		len = style.length;
		while ( len-- ) {
			key = style[ len ];
			if ( typeof style[ key ] === "string" ) {
				styles[ $.camelCase( key ) ] = style[ key ];
			}
		}
	// support: Opera, IE <9
	} else {
		for ( key in style ) {
			if ( typeof style[ key ] === "string" ) {
				styles[ key ] = style[ key ];
			}
		}
	}

	return styles;
}

$.effects.animateClass = function( value, duration, easing, callback ) {
    var o = $.speed( duration, easing, callback );

    return this.queue( function() {
        var animated = $( this ),
            baseClass = animated.attr( "class" ) || "",
            applyClassChange,
            allAnimations = o.children ? animated.find( "*" ).addBack() : animated;

        // map the animated objects to store the original styles.
        allAnimations = allAnimations.map(function() {
            var el = $( this );
            return {
                el: el,
                start: getElementStyles( this )
            };
        });

        // apply class change
        applyClassChange = function() {
            $.each( classAnimationActions, function(i, action) {
                if ( value[ action ] ) {
      ...