JSFiddle - React, Tailwind, and code Playground

HTML

<blockquote id="container" style="margin: 0 0 0 40px; border: none; padding: 0px;">
     <blockquote style="margin-right: 0px; margin-left: 40px; border: none; padding: 0px;">HTML</blockquote>
     <blockquote style="margin-right: 0px; margin-left: 40px; border: none; padding: 0px;">Java</blockquote>
 </blockquote>

JavaScript

YUI().use('node', function(Y) {
    var blockQuotes = Y.all('blockquote > blockquote');
    blockQuotes.each(function (blockQuote) {
        var textNode = document.createTextNode(blockQuote.get('innerHTML'));
        var brNode = document.createElement('br');
        blockQuote.insert(brNode, 'after');
        blockQuote.insert(textNode, 'after');
        blockQuote.remove();
    });
});