JSFiddle - React, Tailwind, and code Playground

HTML

<div class="ui-content">
    Only very strong <strong>person</strong> can handle JavaScript refactoring in CANADA.
</div>

CSS

.query {
    color:green;
}

strong {
    font-weight:bold;
    font-size:2em;
}

.ui-content {
    margin:2em;
}

JavaScript

$(".ui-content").html(function (i, v) {       
     return v.replace(/([^</])(strong)/gi, ' <span class="query">$2</span> ');
});