JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wp-pagenavi">
    <span class="pagination" id="pagination">
       <a href="/_blog/Silly_Creature_of_Cyberspace/page/1/" title="1">1</a>
        2  
       <a href="/_blog/Silly_Creature_of_Cyberspace/page/3/" title="3">3</a>
       <a href="/_blog/Silly_Creature_of_Cyberspace/page/4/" title="4">4</a>
       <a href="/_blog/Silly_Creature_of_Cyberspace/page/5/" title="5">5</a>
        .. 
       <a href="/_blog/Silly_Creature_of_Cyberspace/page/6/" title="6">6</a>
    </span>
</div>

CSS

.orphan {
  color: red;        
}

JavaScript

$(".wp-pagenavi .pagination").contents().filter(function() {
    return this.nodeType != 0;
}).wrap("<span class='orphan'/>");