JSFiddle - React, Tailwind, and code Playground

HTML

<body class="ly_productdetails ProductDetails en en_GB">
    <div id="page">
    <div class="container">
        <div id="main" class="container">
            <div id="info">
                <h2 itemprop="name">Product Name</h2>
                <p><span itemprop="price">&pound;55.00</span></p>
                </div>
            </div>
        </div>
    </div>
</body>

JavaScript

// Confirmed working on Stage 090415	
	
        $(document).ready(function() {   
                var $body = $(document.body);   
                  if ($body.is(".ly_productdetails.ProductDetails.en.en_GB")) {
        		$('#main.content').prepend('<div id="test-widget">Widget</div><script type="text/javascript" src="/frontend/latest/build.min.js"  data-test="test-widget" data-instance="xyz" data-apikey="12345678" data-tags="" async="async"></script>');
            }
            });